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Python 3-Modules

Python Modules

The module is same as the code library. A file containing a set of functions which can be include in our applications.

Create a Module:

To create a module we just save the code file with the extension .py

Example:

Save the below code with greeting.py

def hello(name):
  print("Hello, " + name)

Use a Module:

By using the import statement, we can use the function in other modules.

Example:

Import the module named greeting, and call the hello function:

import greeting
greeting.hello("John")

Output:

Hello John

When we use the function from the module, we use the syntax: module_name.function.name

Variables in Module:

The module can contain functions and variables of all types namely arrays, dictionaries, objects, etc.

Example:

Save the below code mycode.py

person = {
        "name": "John",
        "age": 28,
        "college": "Stanford"
        }

Import the module named mycode in new code and we can access the variables as shown below:

import mycode
a = mycode.person["college"]
print(a)

Output:

Stanford

Naming a Module

The module file can be named whatever we like, but it must have the file extension .py

Re-naming a Module

We can create an alias when we import a module, by using the as keyword

Example:

Create an alias mc for mycode

import mycode as mc
a = mc.person["college"]
print(a)

Output:

Stanford

Built-in Modules

There are many built-in functions in python and can be imported whenever its needed.

Example:

Import and use the platform module:

import platform
a = platform.system()
print(a)

Output:

Windows