### Define source location for example files

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Sets the source location for the example Python files ('a.py' and 'b.py') and their corresponding test file ('test_ab.py'). This Path object is used to access these files throughout the tutorial.

```python
# This folder and included .py files are in docs/api_tutoral/

src_loc = Path("example")
```

--------------------------------

### Install Mutatest using pip

Source: https://mutatest.readthedocs.io/en/latest_badge=latest

Installs the Mutatest mutation testing tool from the Python Package Index (PyPI). This is the standard method for installing Python packages.

```bash
$ pip install mutatest
```

--------------------------------

### Mutatest SurvivingMutantException Example

Source: https://mutatest.readthedocs.io/en/latest/commandline

Illustrates the format of the `SurvivingMutantException` raised by Mutatest when survivor tolerance is breached during mutation trials.

```text
... prior output from trial...

mutatest.cli.SurvivingMutantException: Survivor tolerance breached: 8 / 2

```

--------------------------------

### Install Mutatest from source

Source: https://mutatest.readthedocs.io/en/latest_badge=latest

Installs Mutatest directly from its source code repository. This method is useful for developers who want to work with the latest code or contribute to the project.

```bash
cd mutatest
$ pip install .
```

--------------------------------

### Run Mutatest for API Tutorial Example

Source: https://mutatest.readthedocs.io/en/latest

This command initiates a mutation trial using mutatest. It specifies the source directory ('example/'), the test command ('pytest'), and a random seed ('314') for reproducibility. The output shows the mutation process, including clean trials, identified mutation targets, and the final diagnostic summary.

```bash
$ mutatest -s example/ -t "pytest" -r 314

Running clean trial
2 mutation targets found in example/a.py AST.
1 mutation targets found in example/b.py AST.
Setting random.seed to: 314
Total sample space size: 2
10 exceeds sample space, using full sample: 2. 

Starting individual mutation trials!
Current target location: a.py, LocIndex(ast_class='BinOp', lineno=6, col_offset=11, op_type=<class '_ast.Add'>)
Detected mutation at example/a.py: (6, 11)
Detected mutation at example/a.py: (6, 11)
Surviving mutation at example/a.py: (6, 11)
Break on survival: stopping further mutations at location.

Current target location: b.py, LocIndex(ast_class='CompareIs', lineno=6, col_offset=11, op_type=<class '_ast.Is'>)
Detected mutation at example/b.py: (6, 11)
Running clean trial

Mutatest diagnostic summary
===========================
 - Source location: /home/user/Github/mutatest/docs/api_tutorial/example
 - Test commands: ['pytest']
 - Mode: s
 - Excluded files: []
 - N locations input: 10
 - Random seed: 314

Random sample details
---------------------
 - Total locations mutated: 2
 - Total locations identified: 2
 - Location sample coverage: 100.00 %


Running time details
--------------------
 - Clean trial 1 run time: 0:00:00.348999
 - Clean trial 2 run time: 0:00:00.350213
 - Mutation trials total run time: 0:00:01.389095

Trial Summary Report:

Overall mutation trial summary
==============================
 - DETECTED: 3
 - SURVIVED: 1
 - TOTAL RUNS: 4
 - RUN DATETIME: 2019-10-17 16:57:08.645355

Detected mutations:

DETECTED
--------
 - example/a.py: (l: 6, c: 11) - mutation from <class '_ast.Add'> to <class '_ast.Sub'>
 - example/a.py: (l: 6, c: 11) - mutation from <class '_ast.Add'> to <class '_ast.Mod'>
 - example/b.py: (l: 6, c: 11) - mutation from <class '_ast.Is'> to <class '_ast.IsNot'>

Surviving mutations:

SURVIVED
--------
 - example/a.py: (l: 6, c: 11) - mutation from <class '_ast.Add'> to <class '_ast.Mult'>

```

--------------------------------

### Install Mutatest using conda

Source: https://mutatest.readthedocs.io/en/latest_badge=latest

Installs the Mutatest mutation testing tool from the conda-forge channel. This is an alternative installation method for users who prefer using the Conda package manager.

```bash
$ conda install -c conda-forge mutatest
```

--------------------------------

### Set Filter Codes on GenomeGroup

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Shows how to apply filter codes to all Genomes within a GenomeGroup. The example filters targets to only those with the ('cs',) filter code, simplifying the analysis of specific mutation types.

```python
# Setting filter codes on all Genomes
# in the group

ggrp.set_filter(("cs",))
ggrp.targets

for k, v in ggrp.items():
    print(k, v.filter_codes)
```

--------------------------------

### List files in the source directory

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Prints a list of all files within the specified source directory ('example/'). This helps in visualizing the files involved in the tutorial.

```python
print(*[i for i in src_loc.iterdir()
        if i.is_file()], sep="\n")
```

--------------------------------

### Run Mutation Trial and Check Status

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Demonstrates how to run a mutation trial with a specific genome, mutation target, AST class, and test runner, then access its status. It requires the 'mutatest' library and potentially a testing framework like 'pytest'.

```python
mutant_trial_result = run.create_mutation_run_trial(
    genome, mutation_target, ast.Div, ["pytest"], max_runtime=5
)

mutant_trial_result.status
```

--------------------------------

### Import necessary modules for mutatest API tutorial

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Imports essential modules for the mutatest API tutorial, including AST, Path, run, transformers, Genome, GenomeGroup, MutationException, CoverageFilter, and CategoryCodeFilter. These are used throughout the tutorial for various operations.

```python
import ast

from pathlib import Path

from mutatest import run
from mutatest import transformers
from mutatest.api import Genome, GenomeGroup, MutationException
from mutatest.filters import CoverageFilter, CategoryCodeFilter
```

--------------------------------

### BinOp Mutations Example - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Illustrates binary operation mutations for arithmetic operators like +, -, /, *, etc. The example shows `x = a + b` being mutated to `x = a / b` or `x = a - b`.

```Python
# source code
x = a + b

# mutations
x = a / b  # ast.Div
x = a - b  # ast.Sub
```

--------------------------------

### Create and Inspect GenomeGroup

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Shows how to initialize a GenomeGroup from a source location and iterate through its key-value pairs, where keys are file paths and values are Genome objects. This is useful for managing multiple genomes and accessing their shared properties.

```python
ggrp = GenomeGroup(src_loc)

# key-value pairs in the GenomeGroup are
# the path to the source file
# and the Genome object for that file

for k,v in ggrp.items():
    print(k, v)
```

--------------------------------

### BoolOp Mutations Example - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Illustrates mutations for boolean operations `and` and `or`. The condition `if x and y:` can be mutated to `if x or y:`.

```Python
# source code
if x and y:

# mutation
if x or y:
```

--------------------------------

### BinOp Bitwise Shift Mutations - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Demonstrates mutations for bitwise shift operations `<<` and `>>`. The example `x >> y` can be mutated to `x << y`.

```Python
# source code
x >> y

# mutation
x << y
```

--------------------------------

### Initialize Genome with source file location

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Initializes a `mutatest.api.Genome` object with the path to the source file 'example/a.py'. By default, the `coverage_file` property is set to '.coverage'. The Genome represents a source code file for mutation testing.

```python
# Initialize with the source file location
# By default, the ".coverage" file is set
# for the coverage_file property

genome = Genome(src_loc / "a.py")
```

--------------------------------

### Perform a clean trial of test commands

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Executes a clean trial using `mutatest.run.clean_trial` with the specified source location and pytest commands. This generates a `.coverage` file, which is useful for resetting `__pycache__` and for subsequent mutation trials.

```python
# The return value of clean_trial is the time to run
# this is used in reporting from the CLI

run.clean_trial(
    src_loc, test_cmds=["pytest", "--cov=example"]
)
```

--------------------------------

### Get Mutations for Target

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/transformers

Given a target location index, this function identifies all possible mutations that could be applied based on the AST definitions.

```APIDOC
## GET /websites/mutatest_readthedocs_io/transformer_functions/mutations_for_target

### Description
Given a target, find all the mutations that could apply from the AST definitions.

### Method
GET

### Endpoint
/websites/mutatest_readthedocs_io/transformer_functions/mutations_for_target

### Parameters
#### Path Parameters
None

#### Query Parameters
- **target** (LocIndex) - Required - The target location index for which to find mutations.

### Request Example
None

### Response
#### Success Response (200)
- **mutations** (Set[Any]) - A set of all applicable mutations for the given target.

#### Response Example
```json
{
  "mutations": [
    "MutationType1",
    "MutationType2",
    "..."
  ]
}
```
```

--------------------------------

### Add Folder to GenomeGroup with Tests

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Demonstrates adding all files from a folder to a GenomeGroup, with the option to include test files (`ignore_test_files=False`). This is useful for creating a comprehensive group of genomes for mutation analysis.

```python
# the add_folder options provides
# more flexibility e.g., to include
# the test_ files.

ggrp_with_tests = GenomeGroup()
ggrp_with_tests.add_folder(
    src_loc, ignore_test_files=False
)

for k, v in ggrp_with_tests.items():
    print(k, v)
```

--------------------------------

### Compare Mutations Example - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Shows mutations for comparison operators like `==`, `>=`, `<=`, `>`, `<`, and `!=`. The code `x >= y` can be mutated to `x < y`, `x > y`, or `x != y`.

```Python
# source code
x >= y

# mutations
x < y  # ast.Lt
x > y  # ast.Gt
x != y  # ast.NotEq
```

--------------------------------

### Get Compatible Operation Sets

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/transformers

Retrieves a list of compatible AST mutations supported by mutatest, categorized for use in mutation testing and CLI help.

```APIDOC
## GET /websites/mutatest_readthedocs_io/transformer_functions/compatible_operation_sets

### Description
Utility function to return a list of compatible AST mutations with names. All of the mutation transformation sets that are supported by mutatest are defined here. This is used to create the search space in finding mutations for a target, and also to list the support operations in the CLI help function.

### Method
GET

### Endpoint
/websites/mutatest_readthedocs_io/transformer_functions/compatible_operation_sets

### Parameters
#### Path Parameters
None

#### Query Parameters
None

### Request Example
None

### Response
#### Success Response (200)
- **operations** (List[MutationOpSet]) - A list of MutationOpSet objects, each detailing a mutation category, its description, supported operations, and category identifier.

```json
{
  "operations": [
    {
      "name": "AugAssign",
      "desc": "Augmented assignment e.g. += -= /= *=",
      "operations": [
        "AugAssign_Add",
        "AugAssign_Sub",
        "AugAssign_Mult",
        "AugAssign_Div"
      ],
      "category": "CATEGORIES_AugAssign"
    },
    {
      "name": "BinOp",
      "desc": "Binary operations e.g. + - * / %",
      "operations": [
        "ast.Add",
        "ast.Sub",
        "ast.Div",
        "ast.Mult",
        "ast.Pow",
        "ast.Mod",
        "ast.FloorDiv"
      ],
      "category": "CATEGORIES_BinOp"
    },
    {
      "name": "BinOp Bit Comparison",
      "desc": "Bitwise comparison operations e.g. x & y, x | y, x ^ y",
      "operations": [
        "ast.BitAnd",
        "ast.BitOr",
        "ast.BitXor"
      ],
      "category": "CATEGORIES_BinOpBC"
    },
    {
      "name": "BinOp Bit Shifts",
      "desc": "Bitwise shift operations e.g. << >>",
      "operations": [
        "ast.LShift",
        "ast.RShift"
      ],
      "category": "CATEGORIES_BinOpBS"
    },
    {
      "name": "BoolOp",
      "desc": "Boolean operations e.g. and or",
      "operations": [
        "ast.And",
        "ast.Or"
      ],
      "category": "CATEGORIES_BoolOp"
    },
    {
      "name": "Compare",
      "desc": "Comparison operations e.g. == >= <= > <",
      "operations": [
        "ast.Eq",
        "ast.NotEq",
        "ast.Lt",
        "ast.LtE",
        "ast.Gt",
        "ast.GtE"
      ],
      "category": "CATEGORIES_Compare"
    },
    {
      "name": "Compare In",
      "desc": "Compare membership e.g. in, not in",
      "operations": [
        "ast.In",
        "ast.NotIn"
      ],
      "category": "CATEGORIES_CompareIn"
    },
    {
      "name": "Compare Is",
      "desc": "Comapre identity e.g. is, is not",
      "operations": [
        "ast.Is",
        "ast.IsNot"
      ],
      "category": "CATEGORIES_CompareIs"
    },
    {
      "name": "If",
      "desc": "If statement tests e.g. original statement, True, False",
      "operations": [
        "If_True",
        "If_False",
        "If_Statement"
      ],
      "category": "CATEGORIES_If"
    },
    {
      "name": "Index",
      "desc": "Index values for iterables e.g. i[-1], i[0], i[0][1]",
      "operations": [
        "Index_NumPos",
        "Index_NumNeg",
        "Index_NumZero"
      ],
      "category": "CATEGORIES_Index"
    },
    {
      "name": "NameConstant",
      "desc": "Named constant mutations e.g. True, False, None",
      "operations": [
        true,
        false,
        null
      ],
      "category": "CATEGORIES_NameConstant"
    },
    {
      "name": "Slice Unbounded Swap",
      "desc": "Slice mutations to swap lower/upper values, x[2:] (unbound upper) to x[:2], (unbound lower). Steps are not changed.",
      "operations": [
        "Slice_UnboundUpper",
        "Slice_UnboundLower",
        "Slice_Unbounded"
      ],
      "category": "CATEGORIES_SliceUS"
    }
  ]
}
```
```

--------------------------------

### Prepare for Mutation: Reset and Filter - Python

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Resets the genome to a specific source file ('a.py') and filters its targets to include only 'BinOp' (binary operation) codes. This prepares the genome for targeted mutation.

```python
# Set the Genome back to example a
# filter to only the BinOp targets

genome.source_file = src_loc / "a.py"
genome.filter_codes = ("bn",)
```

--------------------------------

### Get Valid Codes - Python

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Retrieves all potential valid codes available in the catcode_filter. This is useful for understanding the scope of possible code identifiers.

```python
catcode_filter.valid_codes
```

--------------------------------

### Accessing Mutation Targets and Covered Targets in Genome

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Demonstrates how to access the `targets` and `covered_targets` properties of a `Genome` object. These properties return sets of `LocIndex` objects representing AST locations that can be mutated. `covered_targets` specifically includes locations with coverage information.

```python
genome.targets


```

```python
# Example output for genome.targets:
# {LocIndex(ast_class='BinOp', lineno=6, col_offset=11, op_type=<class '_ast.Add'>, end_lineno=6, end_col_offset=16),
#  LocIndex(ast_class='Compare', lineno=10, col_offset=11, op_type=<class '_ast.Gt'>, end_lineno=10, end_col_offset=16)}


```

```python
genome.covered_targets


```

```python
# Example output for genome.covered_targets:
# {LocIndex(ast_class='BinOp', lineno=6, col_offset=11, op_type=<class '_ast.Add'>, end_lineno=6, end_col_offset=16)}


```

```python
# Finding targets not covered by coverage
genome.targets - genome.covered_targets


```

```python
# Example output for uncovered targets:
# {LocIndex(ast_class='Compare', lineno=10, col_offset=11, op_type=<class '_ast.Gt'>, end_lineno=10, end_col_offset=16)}

```

--------------------------------

### NameConstant Mutations - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Shows mutations for named constants like `True`, `False`, and `None`. The example `x = True` can be mutated to `x = False` or `x = None`.

```Python
# source code
x = True

# mutations
x = False
X = None
```

--------------------------------

### Accessing the Abstract Syntax Tree (AST) of a Genome

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Explains how to access the Abstract Syntax Tree (AST) of a source file through the `ast` property of the `Genome` object. This property provides access to the root of the AST, allowing inspection of its structure, including the body of the module and the properties of individual AST nodes.

```python
genome.ast


```

```python
# Example output for genome.ast:
# <_ast.Module object at 0x...> 


```

```python
genome.ast.body


```

```python
# Example output for genome.ast.body:
# [<ast.Expr object at ...>, <ast.FunctionDef object at ...>, ...]


```

```python
genome.ast.body[1].__dict__


```

```python
# Example output for properties of an AST node (e.g., FunctionDef):
# {'name': 'add_five', 'args': <_ast.arguments object at ...>, 'body': [<ast.Return object at ...>], 'decorator_list': [], 'returns': None, 'type_comment': None, 'lineno': 5, 'col_offset': 0, 'end_lineno': 6, 'end_col_offset': 16}

```

--------------------------------

### Get CLI Help Epilog Text

Source: https://mutatest.readthedocs.io/en/latest/modules

Provides the epilog text to be displayed at the end of the Mutatest CLI help message. This can include additional usage information or notes.

```python
def cli_epilog() -> str:
    """Epilog for the help output.
    """
    # Placeholder for actual implementation
    pass

```

--------------------------------

### Get Genome Group (Python)

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/run

Retrieves a GenomeGroup based on a source location and configuration. It handles both single files and directories, applying filters and exclusions as specified in the config.

```python
from pathlib import Path

# Assuming GenomeGroup, Config, LOGGER, and colorize_output are defined/imported

def get_genome_group(src_loc: Path, config: Config) -> GenomeGroup:
    """Get the ``GenomeGroup`` based on ``src_loc`` and ``config``.

    ``Config`` is used to set global filter codes and exclude files on group creation.

    Args:
        src_loc: Path, can be directory or file
        config: the running config object

    Returns:
        ``GenomeGroup`` based on ``src_loc`` and config.
    """
    ggrp = GenomeGroup()

    # check if src_loc is a single file, otherwise assume it's a directory
    if src_loc.is_file():
        ggrp.add_file(source_file=src_loc)

    else:
        ggrp.add_folder(
            source_folder=src_loc, exclude_files=config.exclude_files, ignore_test_files=True
        )

    if config.filter_codes:
        LOGGER.info("Category restriction, chosen categories: %s", sorted(config.filter_codes))
        ggrp.set_filter(filter_codes=config.filter_codes)

    for k, genome in ggrp.items():
        LOGGER.info(
            "%s",
            colorize_output(
                f"{len(genome.targets)} mutation targets found in {genome.source_file} AST.",
                "green" if len(genome.targets) > 0 else "yellow",
            ),
        )

    for e in config.exclude_files:
        LOGGER.info("%s", colorize_output(f"{e.resolve()} excluded.", "yellow"))

    return ggrp

```

--------------------------------

### Configuration and Utilities

Source: https://mutatest.readthedocs.io/en/latest/modules

Utilities for managing run configurations, output formatting, and capturing output.

```APIDOC
## GET /run/config

### Description
Retrieves the current run configuration object.

### Method
GET

### Endpoint
/run/config

### Parameters
None

### Request Example
```json
{}
```

### Response
#### Success Response (200)
- **Config** (mutatest.run.Config) - The configuration object for mutation trials.

#### Response Example
```json
{
  "n_locations": 0,
  "exclude_files": [],
  "filter_codes": [],
  "random_seed": null,
  "break_on_survival": false,
  "break_on_detected": false,
  "break_on_error": false,
  "break_on_unknown": false,
  "break_on_timeout": false,
  "ignore_coverage": false,
  "max_runtime": 10.0,
  "multi_processing": false
}
```

## POST /run/config

### Description
Sets or updates the run configuration for mutation trials.

### Method
POST

### Endpoint
/run/config

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **n_locations** (int) - Optional. Number of locations to mutate.
- **exclude_files** (List[pathlib.Path]) - Optional. List of files to exclude.
- **filter_codes** (List[str]) - Optional. List of filter codes.
- **random_seed** (Optional[int]) - Optional. Seed for random number generation.
- **break_on_survival** (bool) - Optional. Break on survival.
- **break_on_detected** (bool) - Optional. Break on detected.
- **break_on_error** (bool) - Optional. Break on error.
- **break_on_unknown** (bool) - Optional. Break on unknown.
- **break_on_timeout** (bool) - Optional. Break on timeout.
- **ignore_coverage** (bool) - Optional. Ignore coverage.
- **max_runtime** (float) - Optional. Maximum runtime for trials.
- **multi_processing** (bool) - Optional. Enable multi-processing.

### Request Example
```json
{
  "max_runtime": 30.0,
  "multi_processing": true
}
```

### Response
#### Success Response (200)
- **message** (str) - Confirmation message.

#### Response Example
```json
{
  "message": "Configuration updated successfully."
}
```

## POST /run/capture_output

### Description
Utility function to determine if output should be captured based on the log level.

### Method
POST

### Endpoint
/run/capture_output

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **log_level** (int) - The logging level (e.g., 10 for DEBUG).

### Request Example
```json
{
  "log_level": 20
}
```

### Response
#### Success Response (200)
- **capture** (bool) - True if output should be captured, False otherwise.

#### Response Example
```json
{
  "capture": true
}
```

## POST /run/colorize_output

### Description
Colorizes a given string output with a specified terminal color.

### Method
POST

### Endpoint
/run/colorize_output

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **output** (str) - The string to colorize.
- **color** (str) - The color to use ('red' or 'green').

### Request Example
```json
{
  "output": "Mutation failed!",
  "color": "red"
}
```

### Response
#### Success Response (200)
- **colorized_output** (str) - The colorized string, or the original string if the color is invalid.

#### Response Example
```json
{
  "colorized_output": "\033[91mMutation failed!\033[0m"
}
```

```

--------------------------------

### Get Valid Categories - Python

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Retrieves a mapping of valid category names to their corresponding codes. This helps in understanding which codes are associated with specific AST node types or operations.

```python
catcode_filter.valid_categories
```

--------------------------------

### Discard Code and View Mutations - Python

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Shows how to remove a code from the active set and then re-evaluates the available mutations. This illustrates the impact of code removal on mutation possibilities.

```python
# discard codes

catcode_filter.discard_code("aa")
catcode_filter.codes

catcode_filter.valid_mutations
```

--------------------------------

### Slice Mutations Example - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Illustrates slice mutations, such as changing `x[:2]` to `x[2:]` or swapping bounds when `None` is involved. `Slice_UnboundedUpper` mutates the upper bound to be unbounded.

```Python
# source code
w = a[:2]
x = a[4:]

# mutation
w = a[2:]  # Slice_UnboundedUpper, upper is now unbounded and lower has a value
x = a[4:]
```

--------------------------------

### View Valid Mutations - Python

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Displays all possible mutations that can be applied based on the currently set codes. This provides insight into the types of code transformations Mutatest can perform.

```python
# see all validation mutations
# based on the set codes

catcode_filter.valid_mutations
```

--------------------------------

### AugAssign Mutations Example - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Demonstrates augmented assignment mutations such as +=, -=, *=, and /=. The original code `x += y` can be mutated to `x -= y`, `x *= y`, or `x /= y`.

```Python
# source code
x += y

# mutations
x -= y  # AugAssign_Sub
x *= y  # AugAssign_Mult
x /= y  # AugAssign_Div
```

--------------------------------

### Run Single Mutation Trial - Python

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Executes a single mutation trial using the `run.create_mutation_run_trial` function. This applies a specified mutation to a target and runs tests, returning the trial result.

```python
# Alternatively, use run to do a single trial
# and return the result

mutant_trial_result = run.create_mutation_run_trial(
    genome, mutation_target, ast.Mult, ["pytest"], max_runtime=5
)
```

--------------------------------

### Main CLI Entry Point

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/cli

The primary entry point for the Mutatest command-line tool. It first checks cache invalidation status, then parses command-line arguments, and finally calls the main mutation testing function.

```python
import sys

# Assume cache and main are defined elsewhere
# from .cache import check_cache_invalidation_mode
# from .core import main

def cli_main() -> None:
    """Entry point to run CLI args and execute main function."""
    # Run a quick check at the beginning in case of later OS errors.
    cache.check_cache_invalidation_mode() # Assuming cache.check_cache_invalidation_mode() performs a check
    args = cli_args(sys.argv[1:]) # Calls the argument parsing function
    main(args) # Calls the main mutation testing function with parsed arguments
```

--------------------------------

### Get Mutation Sample Space (Python)

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/run

Retrieves the sample space for mutation trials, prioritizing covered targets unless coverage is ignored or unavailable. It returns a sorted list of targets.

```python
from pathlib import Path
from typing import List
from operator import attrgetter

# Assuming GenomeGroup and GenomeGroupTarget are defined elsewhere
# Assuming LOGGER is configured for logging

def get_sample(ggrp: GenomeGroup, ignore_coverage: bool) -> List[GenomeGroupTarget]:
    """Get the sample space for the mutation trials.

    This will attempt to use covered-targets as the default unless ``ignore_coverage`` is set
    to True. If the set .coverage file is not found then the total targets are returned instead.

    Args:
        ggrp: the Genome Group to generate the sample space of targets
        ignore_coverage: flag to ignore coverage if present

    Returns:
        Sorted list of Path-LocIndex pairs as complete sample space from the ``GenomeGroup``.
    """
    if ignore_coverage:
        LOGGER.info("Ignoring coverage file for sample space creation.")

    try:
        sample = ggrp.targets if ignore_coverage else ggrp.covered_targets

    except FileNotFoundError:
        LOGGER.info("Coverage file does not exist, proceeding to sample from all targets.")
        sample = ggrp.targets

    # sorted list used for repeat trials using random seed instead of set
    sort_by_keys = attrgetter(
        "source_path",
        "loc_idx.lineno",
        "loc_idx.col_offset",
        "loc_idx.end_lineno",
        "loc_idx.end_col_offset",
    )
    return sorted(sample, key=sort_by_keys)

```

--------------------------------

### Get Source Location - Python

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/cli

Determines the source code location for mutation testing. If a location is not provided, it attempts to automatically find the first package. Raises a FileNotFoundError if no source location can be determined.

```python
def get_src_location(src_loc: Optional[Path] = None) -> Path:
    """Find packages is used if the ``src_loc`` is not set

    Args:
        src_loc: current source location, defaults to None

    Returns:
        Path to the source location

    Raises:
        FileNoeFoundError: if the source location doesn't exist.
    """
    if not src_loc:
        find_pkgs = find_packages()
        if find_pkgs:
            src_loc = Path(find_pkgs[0])
            return src_loc
    else:
        if src_loc.exists():
            return src_loc

    raise FileNotFoundError(
        "No source directory specified or automatically detected. "
        "Use --src or --help to see options."
    )
```

--------------------------------

### Set Coverage File for GenomeGroup

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Demonstrates setting a coverage file for an entire GenomeGroup, which then filters the targets to only those covered by the specified file. This helps in analyzing mutation targets within the context of actual test coverage.

```python
# You can set a filter or
# coverage file for the entire set
# of genomes

ggrp.set_coverage = Path(".coverage")

for t in ggrp.covered_targets:
    print(
        t.source_path, t.loc_idx
    )
```

--------------------------------

### Get Mutations for Target (Python)

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/transformers

Given a target location index, this function identifies all potential mutations that can be applied based on the Abstract Syntax Tree (AST) definitions. It serves to determine the possible transformations for a specific part of the code.

```python
import ast
from typing import Set, Any

# Assuming LocIndex is defined elsewhere, e.g.:
class LocIndex:
    def __init__(self, filename: str, lineno: int, col_offset: int):
        self.filename = filename
        self.lineno = lineno
        self.col_offset = col_offset

def get_mutations_for_target(target: LocIndex) -> Set[Any]:
    """Given a target, find all the mutations that could apply from the AST definitions.

    Args:
        target: The location index (filename, line number, column offset) of the target code.

    Returns:
        A set of applicable mutation types for the given target.
    """
    # This is a placeholder for the actual implementation.
    # The real implementation would involve parsing the AST of the target code
    # and comparing it against the defined mutation operation sets.
    applicable_mutations: Set[Any] = set()
    # Example: if target node is an ast.BinOp, add BinOp related mutations
    # if target node is ast.Compare, add Compare related mutations
    # ... and so on for all AST node types and custom mutations.
    return applicable_mutations

```

--------------------------------

### Specify Source Files and Test Commands

Source: https://mutatest.readthedocs.io/en/latest/commandline

Enables targeting specific source files and their corresponding test files for mutation testing. This is useful for focused testing within a larger package. Supports both long and short argument forms.

```bash
$ mutatest --src mypackage/run.py --testcmds "pytest tests/test_run.py"

```

```bash
# using shorthand arguments
$ mutatest -s mypackage/run.py -t "pytest tests/test_run.py"

```

--------------------------------

### mutatest.cli.cli_main

Source: https://mutatest.readthedocs.io/en/latest/modules

The main entry point for the Mutatest CLI. It handles parsing arguments and executing the primary mutation testing routine.

```APIDOC
## POST /cli/main

### Description
Entry point to run CLI args and execute the main mutation testing function.

### Method
POST

### Endpoint
/cli/main

### Response
#### Success Response (200)
- **None** - Indicates successful execution.
```

--------------------------------

### Index Mutations Example - Python

Source: https://mutatest.readthedocs.io/en/latest/mutants

Demonstrates mutations to index values within iterables. Positive indices can be mutated to `Index_NumPos`, negative to `Index_NumNeg`, and zero indices to `Index_NumZero`. Mutations can also involve changing the index to 0, 1, or -1.

```Python
# source code
x = [a[10], a[-4], a[0]]

# mutations
x = [a[-1], a[-4], a[0]]  # a[10] mutated to Index_NumNeg
x = [a[10], a[0], a[0]]  # a[-4] mutated to Index_NumZero
x = [a[10], a[1], a[0]]  # a[-4] mutated to Index_NumPos
x = [a[10], a[-4], a[1]]  # a[0] mutated to Index_NumPos
```

--------------------------------

### Get Status Summary Dictionary

Source: https://mutatest.readthedocs.io/en/latest/_modules/mutatest/report

Calculates a summary of mutant trial statuses and returns it as a dictionary. It counts the occurrences of each status (e.g., DETECTED, TIMEOUT, SURVIVED) and adds the total number of runs and the current execution time. This dictionary is intended for use in formatting the final report.

```python
def get_status_summary(trial_results: List[MutantTrialResult]) -> Dict[str, Union[str, int]]:
    """Create a status summary dictionary for later formatting.

    Args:
        trial_results: list of mutant trials

    Returns:
        Dictionary with keys for formatting in the report
    """
    status: Dict[str, Union[str, int]] = dict(Counter([t.status for t in trial_results]))
    status["TOTAL RUNS"] = len(trial_results)
    status["RUN DATETIME"] = str(datetime.now())

    return status
```

--------------------------------

### Display contents of b.py

Source: https://mutatest.readthedocs.io/en/latest/api_tutorial/api_tutorial

Reads and prints the content of the 'b.py' file. This file contains a function 'is_match' that checks for equality using the 'is' operator. The output shows the source code of this function.

```python
# Contents of b.py example source file

open_print(src_loc / "b.py")
```