### Install crosszip using pip or uv

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Install the crosszip package using either pip or uv package managers.

```bash
pip install crosszip
```

```bash
uv add crosszip
```

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

### Generate Labels using crosszip

Source: https://github.com/indrajeetpatil/crosszip/blob/main/README.md

Use crosszip to apply a function to all possible combinations of elements from multiple iterables. Ensure the crosszip library is installed.

```python
from crosszip import crosszip

def create_label(category, subcategory, version):
    return f"{category}_{subcategory}_v{version}"

categories = ["cat", "dog"]
subcategories = ["small", "large"]
versions = ["1.0", "2.0"]

labels = crosszip(create_label, categories, subcategories, versions)
print(labels)
```

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

### Parametrize Pytest with crosszip_parametrize

Source: https://github.com/indrajeetpatil/crosszip/blob/main/README.md

Utilize the @pytest.mark.crosszip_parametrize marker to run tests with all combinations of provided parameter values. This requires pytest and crosszip to be installed.

```python
import math
import crosszip
import pytest


@pytest.mark.crosszip_parametrize(
    "base",
    [2, 10],
    "exponent",
    [-1, 0, 1],
)
def test_power_function(base, exponent):
    result = math.pow(base, exponent)
    assert result == base**exponent


print("Tests executed successfully.")
```

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

### Handling Custom Crosszip Exceptions

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Shows how to import and catch specific custom exceptions provided by the crosszip package.

```python
from crosszip.exceptions import (
    CrosszipError,
    CrosszipTypeError,
    CrosszipValueError,
)

# CrosszipError is the base exception for all crosszip errors
# CrosszipTypeError inherits from CrosszipError and TypeError
# CrosszipValueError inherits from CrosszipError and ValueError

try:
    # Some crosszip operation that might fail
    pass
except CrosszipTypeError as e:
    print(f"Type error: {e}")
except CrosszipValueError as e:
    print(f"Value error: {e}")
except CrosszipError as e:
    print(f"Crosszip error: {e}")
```

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

### Crosszip with tuples and a mathematical function

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Demonstrates using crosszip with tuples and a simple mathematical function. The function should accept arguments corresponding to the elements in the tuples.

```python
from crosszip import crosszip

# With tuples and a mathematical function
def add(a, b):
    return a + b

result = crosszip(add, (1, 2), (10, 20))
print(result)
# Output: [11, 21, 12, 22]
```

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

### Pytest: Parametrize tests with crosszip_parametrize (three parameters)

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Demonstrates using `@pytest.mark.crosszip_parametrize` with three parameters, automatically generating 8 test cases (2x2x2 combinations).

```python
import math
import pytest

# Three parameters: generates 8 test cases (2 × 2 × 2)
@pytest.mark.crosszip_parametrize(
    "x", [1, 2],
    "y", [3, 4],
    "z", [5, 6],
)
def test_three_params(x, y, z):
    assert (x, y, z) in [
        (1, 3, 5), (1, 3, 6), (1, 4, 5), (1, 4, 6),
        (2, 3, 5), (2, 3, 6), (2, 4, 5), (2, 4, 6),
    ]
```

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

### Pytest: Parametrize tests with crosszip_parametrize (single parameter)

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Shows how to use `@pytest.mark.crosszip_parametrize` with a single parameter, generating 3 test cases for the provided list of values.

```python
import math
import pytest

# Single parameter
@pytest.mark.crosszip_parametrize(
    "value", [1, 2, 3],
)
def test_single_param(value):
    assert value in [1, 2, 3]
# This generates 3 test cases
```

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

### Pytest: Parametrize tests with crosszip_parametrize (two parameters)

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Uses the `@pytest.mark.crosszip_parametrize` marker to run a test function with all combinations of two parameters. This generates 6 test cases for the given inputs.

```python
import math
import pytest

# Basic usage: Test all combinations of base and exponent values
@pytest.mark.crosszip_parametrize(
    "base", [2, 10],
    "exponent", [-1, 0, 1],
)
def test_power_function(base, exponent):
    result = math.pow(base, exponent)
    assert result == base ** exponent
# This generates 6 test cases: (2,-1), (2,0), (2,1), (10,-1), (10,0), (10,1)
```

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

### Pytest Error Handling: No parameters provided

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Illustrates an error case for `@pytest.mark.crosszip_parametrize` where no parameters are provided, resulting in a `ValueError`.

```python
import pytest

# Error: Parameter names and values must be provided
@pytest.mark.crosszip_parametrize()
def test_no_params():
    pass
# Raises: ValueError: Parameter names and values must be provided.
```

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

### Crosszip with a generator, list, and string

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Illustrates using crosszip with a generator, a list, and a list of strings. The provided lambda function concatenates elements from all three iterables.

```python
from crosszip import crosszip

# With a generator
def gen():
    yield 1
    yield 2

concat = lambda a, b, c: f"{a}-{b}-{c}"
result = crosszip(concat, gen(), [3, 4], ["a", "b"])
print(result)
# Output: ['1-3-a', '1-3-b', '1-4-a', '1-4-b', '2-3-a', '2-3-b', '2-4-a', '2-4-b']
```

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

### Crosszip with range and string

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Combines a range object and a string using crosszip with a lambda function for string formatting. The lambda function processes elements from both iterables.

```python
from crosszip import crosszip

# With range and string
result = crosszip(lambda a, b: f"{a}-{b}", range(1, 3), "ab")
print(result)
# Output: ['1-a', '1-b', '2-a', '2-b']
```

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

### Crosszip with sets

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Applies a function to combinations of elements from sets. Note that the order of results is not guaranteed due to the unordered nature of sets.

```python
from crosszip import crosszip

# With sets (note: order may vary due to set unordered nature)
concat = lambda a, b, c: f"{a}-{b}-{c}"
result = crosszip(concat, {1, 2}, {"x", "y"}, {"foo", "bar"})
# Results contain all 8 combinations, but order is not guaranteed
```

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

### Basic crosszip usage with a custom function

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Applies a custom function to all combinations of elements from provided iterables. Ensure the function signature matches the number of iterables.

```python
from crosszip import crosszip

# Basic usage: Apply a function to all combinations of elements
def create_label(category, subcategory, version):
    return f"{category}_{subcategory}_v{version}"

categories = ["cat", "dog"]
subcategories = ["small", "large"]
versions = ["1.0", "2.0"]

labels = crosszip(create_label, categories, subcategories, versions)
print(labels)
# Output: ['cat_small_v1.0', 'cat_small_v2.0', 'cat_large_v1.0', 'cat_large_v2.0',
#          'dog_small_v1.0', 'dog_small_v2.0', 'dog_large_v1.0', 'dog_large_v2.0']
```

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

### Pytest Error Handling: Missing parameter values

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Demonstrates an error scenario where a parameter name is provided without corresponding values, triggering a `ValueError`.

```python
import pytest

# Error: Each parameter name must have a corresponding list of values
@pytest.mark.crosszip_parametrize(
    "x", [1, 2],
    "y",  # Missing values for y
)
def test_missing_values(x, y):
    pass
# Raises: ValueError: Each parameter name must have a corresponding list of values.
```

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

### Pytest Error Handling: Empty parameter values

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Illustrates an error when parameter values are an empty sequence (e.g., an empty list), which raises a `TypeError`. Parameter values must be non-empty sequences.

```python
import pytest

# Error: All parameter values must be non-empty sequences
@pytest.mark.crosszip_parametrize(
    "x", [],  # Empty list
    "y", [3, 4],
)
def test_empty_values(x, y):
    pass
# Raises: TypeError: All parameter values must be non-empty sequences.
```

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

### Triggering a TypeError with crosszip_parametrize

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Demonstrates an invalid usage of crosszip_parametrize where a scalar is passed instead of a sequence.

```python
@pytest.mark.crosszip_parametrize(
    "x", 1,  # Not a sequence
    "y", [3, 4],
)
def test_non_sequence(x, y):
    pass
```

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

### Pytest Error Handling: Invalid parameter name type

Source: https://context7.com/indrajeetpatil/crosszip/llms.txt

Shows an error case where a parameter name is not a string, leading to a `TypeError`. All parameter names must be strings.

```python
import pytest

# Error: All parameter names must be strings
@pytest.mark.crosszip_parametrize(
    123, [1, 2],  # 123 is not a string
    "y", [3, 4],
)
def test_invalid_name(x, y):
    pass
# Raises: TypeError: All parameter names must be strings.
```

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