Python Modules

In Python, a module is a file containing Python definitions and statements. The module can define functions, classes, and variables, and can be imported and used in other Python programs.

To use a module in a Python program, you can use the import statement. Here's an example:

import math

x = math.sqrt(25)

print(x)  # Output: 5.0

In this example, we import the math module using the import statement. We then use the sqrt() function from the math module to compute the square root of 25, and store the result in the variable x. Finally, we print the value of x, which should be 5.0.

You can also import specific functions, classes, or variables from a module using the from keyword. Here's an example:

from math import sqrt

x = sqrt(25)

print(x)  # Output: 5.0

In this example, we import only the sqrt() function from the math module using the from keyword. We can then use the sqrt() function directly without the math. prefix.

You can also create your own modules in Python by defining functions, classes, and variables in a Python file, and then importing them in other Python programs. To import a module that you've created, you simply need to specify the filename (without the .py extension) in the import statement. For example, if you have a file named mymodule.py containing some Python code, you can import it in another Python program using the following statement:

import mymodule

Once you've imported the module, you can use the functions, classes, and variables defined in the module in your program.