### Install pygrowup2 from source

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Install the pygrowup2 package directly from its GitHub repository. This is useful for development or when the latest changes are needed.

```bash
pip install git+https://github.com/jbaldivieso/pygrowup2.git
```

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

### Install pygrowup2 using pip

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Install the pygrowup2 package using pip. This is the standard method for installing Python packages.

```bash
pip install pygrowup2
```

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

### Instantiate Observation objects

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Demonstrates three ways to create an Observation object for a 13-month-old boy. Observations can be created using age in days, age in months, or by providing date of birth and observation date.

```python
from datetime import date, timedelta
from decimal import Decimal

from pygrowup import Observation

# Three ways of instantiating roughly comparable Observations for a
# 13-month-old boy.
today = date.today()
thirteen_months_ago = today - timedelta(days=365 + 30)
obs = Observation(sex=Observation.MALE, age_in_days=13*30)
obs = Observation(sex=Observation.MALE, age_in_months=13)
obs = Observation(sex=Observation.MALE, dob=thirteen_months_ago,
                  date_of_observation=today)
```

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

### Run pygrowup2 tests

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Execute the tests for the pygrowup2 package using the Python module runner. This command runs tests against WHO and SPOON datasets.

```bash
python -m pygrowup.tests
```

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

### Calculate Weight for Length z-score

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Calculates the weight for length z-score. This method requires both weight and length measurements as arguments.

```python
print(obs.weight_for_length(Decimal('9.6'), Decimal('77')))
```

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

### Calculate Weight for Age z-score

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Calculates the weight for age z-score. The measurement can be provided as a Decimal, float, or int.

```python
print(obs.weight_for_age(Decimal('9.6')))
```

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

### Calculate Length or Height for Age z-score

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Calculates the length or height for age z-score. The measurement can be provided as a Decimal, float, or int.

```python
print(obs.length_or_height_for_age(Decimal('77')))
```

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

### Calculate Head Circumference for Age z-score

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Calculates the head circumference for age z-score using the Observation object. Measurements can be provided as Decimal, float, or int.

```python
# Now calculate some z-scores for this child
print(obs.head_circumference_for_age(Decimal('46.5')))
```

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

### Calculate Head Circumference for Age z-score (alias)

Source: https://github.com/jbaldivieso/pygrowup2/blob/master/README.md

Calculates the head circumference for age z-score using the succinct alias 'hcfa'. This provides a shorter way to access the same functionality.

```python
print(obs.hcfa(46.5))  # Same result as the previous computation.
```

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