Summary  
Demonstrates how to use pandas’ max() and min() methods to retrieve the highest and lowest values from an entire DataFrame or from a specific column.  

General domain of usage  
Data analysis

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

```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 dataset.
```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()
```

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
        )


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() and min()

解答