Python Modules

Python Modules

Consider a module to be the same as a code library. A file containing a set of functions you want to include in your application.

Create a Module

To create a module just save the code you want in a file with the file extension .py:

# Save this code in a file named mymodule.py
def greeting(name):
    print("Hello, " + name)

Use a Module

Now we can use the module we just created, by using the import statement:

import mymodule

mymodule.greeting("Jonathan")

Variables in Module

The module can contain functions, as already described, but also variables of all types (arrays, dictionaries, objects etc):

# In mymodule.py
person1 = {
    "name": "John",
    "age": 36,
    "country": "Norway"
}

# In main file
import mymodule

a = mymodule.person1["age"]
print(a)  # 36

Built-in Modules

Python has several built-in modules that you can import whenever you like:

import platform

x = platform.system()
print(x)  # Linux, Windows, etc.