Summary  
This chapter covers using Pandas’ max(), min(), and mean() methods to compute the highest, lowest, and average values of numeric columns or entire data frames.

General domain of usage  
Exploratory data analysis

Explore how to use the `max()`, `min()`, and `mean()` methods in pandas to analyze your data. This video walks you through each method step by step, using clear examples with real DataFrames. You'll see how to quickly find the highest, lowest, and average values in your data, learn the difference between applying these methods to entire DataFrames versus specific columns, and understand how these tools help summarize and interpret your datasets efficiently. By the end, you'll be able to confidently use these essential pandas methods in your own projects.

`pandas` provides the `max()` method, which returns the **highest value** from a specified column.

```python
df = pd.read_csv(file.csv)
max_value = df.max()
```

To identify the highest value of a specific column, you can use this approach:
```python
df = pd.read_csv(file.csv)
max_values = df['column_name'].max()
```

Similarly, `pandas` offers the `min()` method that fetches the **smallest value** from a given column.
```python
df = pd.read_csv(file.csv)
min_value = df.min()
```

To determine the smallest value for a particular column, the same method is used:
```python
df = pd.read_csv(file.csv)
min_values = df['column_name'].min()
```

Similarly, `pandas` offers the `mean()` method that fetches the **average value** from a given column.

```python
df = pd.read_csv(file.csv)
average_value = df.mean()
```

To determine the average value for a **particular column**, the same method is used:

```python
df = pd.read_csv(file.csv)
average_value = df['column_name'].mean()
```

import unittest
import importlib


def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)


class TestUserCode(unittest.TestCase):

    def test_highest_price_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'highest_price'),
            "The `highest_price` variable is declared.",
            "Expected `highest_price` to be declared."
        )

    def test_highest_price_is_correct(self):
        import user_code
        expected_value = max([12500, 16500, 16800, 17300, 16500])

        try:
            actual_value = user_code.highest_price
            condition = actual_value == expected_value
            failure_message = f"Expected `highest_price` to be `{expected_value}`, but got `{actual_value}`."
        except AttributeError:
            condition = False
            failure_message = "The `highest_price` variable is not declared."

        _dynamic_test(
            self,
            condition,
            f"The `highest_price` is `{expected_value}`.",
            failure_message
        )

    def test_lowest_price_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'lowest_price'),
            "The `lowest_price` variable is declared.",
            "Expected `lowest_price` to be declared."
        )

    def test_lowest_price_is_correct(self):
        import user_code
        expected_value = min([12500, 16500, 16800, 17300, 16500])

        try:
            actual_value = user_code.lowest_price
            condition = actual_value == expected_value
            failure_message = f"Expected `lowest_price` to be `{expected_value}`, but got `{actual_value}`."
        except AttributeError:
            condition = False
            failure_message = "The `lowest_price` variable is not declared."

        _dynamic_test(
            self,
            condition,
            f"`lowest_price` has correct value.",
            failure_message
        )

    def test_average_price_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'average_price'),
            "The `average_price` variable is declared.",
            "Expected `average_price` to be declared."
        )

    def test_average_price_is_correct(self):
        import user_code
        expected_value = sum([12500, 16500, 16800, 17300, 16500]) / 5

        try:
            actual_value = user_code.average_price
            condition = actual_value == expected_value
            failure_message = f"Expected `average_price` to be `{expected_value}`, but got `{actual_value}`."
        except AttributeError:
            condition = False
            failure_message = "The `average_price` variable is not declared."

        _dynamic_test(
            self,
            condition,
            "`average_price` has correct value.",
            failure_message
        )


if __name__ == '__main__':
    unittest.main()

test_main.py

Pandas is an extremely user-friendly library for data analysis. It's also designed to handle large datasets, using data structures like DataFrame and Series. This makes it an invaluable tool for Data Science. In this guide, you'll get acquainted with a range of statistical functions, including how to find correlations, modes, medians, and maximum and minimum values within a dataset. You'll also learn how to handle missing values and manipulate specific values, as well as how to remove them.

Dive into the fundamentals of the pandas library. Learn to create and manipulate Series and DataFrames, explore their structure, and build confidence in performing essential data operations.

Master how to load and manage data from CSV and TXT files. Gain practical experience importing datasets and preparing them for further analysis using pandas tools.

Learn to explore, clean, and summarize data effectively. Understand how to handle missing values, extract insights, and perform basic statistical operations with pandas.

max(), min() and mean()

Solution