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Chapter3 (Part 3)

This document discusses Python modules and how to define, create, import, and use modules in Python. It provides examples of creating a module file, importing the module, importing specific elements from a module, and using an alias when importing a module.

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Ariesya Syafika
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5 views

Chapter3 (Part 3)

This document discusses Python modules and how to define, create, import, and use modules in Python. It provides examples of creating a module file, importing the module, importing specific elements from a module, and using an alias when importing a module.

Uploaded by

Ariesya Syafika
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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TOPIC 3 : FUNCTION AND

OBJECT-ORIENTED PYTHON
3.1 USE FUNCTION IN PYTHON (PART 3)
Learning Outcome:
•Define Function
•Define Call Function
•Import and Use Module √
Import and Use Module
Define Python Modules
• Python module is a piece of code.
• Exiting the interpreter destroys all functions and variables we
created. But when we want a longer program, we create a script.
• With Python, we can put such definitions in a file, and use them
in a script, or in an interactive instance of the interpreter. Such a
file is a module.
• A module is a file that contains Python statements and
definitions. A Python modules looks like this:
Example : calc.py
How to Create Python Modules?
To create a module just save the code you want in a file with
the file extension .py:

Example:
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:

Example:
Import the module named mymodule, and call the greeting
function:

import mymodule
mymodule.greeting("Jonathan")

Note: When using a function from a module, use the syntax:


module_name.function_name
Variables in Module
The module can contain functions, but also variables of
all types (arrays, dictionaries, objects etc):

Example:
Save this code in the file mymodule.py

person1 = {
"name": "John",
"age": 36,
"country": "Norway"
}
Variables in Module

Example:
Import the module named mymodule, and access the
person1 dictionary:
import mymodule

a = mymodule.person1["age"]
print(a)
Output : 36
Re-naming a Module
• Can create an alias when you import a module, by using the
as keyword:

Example:
Create an alias for mymodule called mx:

import mymodule as mx

a = mx.person1["age"]
print(a)
Import From Module
• Can choose to import only parts from a module, by using the
from keyword.

Example:
The module named mymodule has one function and one dictionary:

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

person1 = {
"name": "John",
"age": 36,
"country": "Norway"
}
Import From Module
Example:
Import only the person1 dictionary from the module:
from mymodule import person1

print (person1["age"])

Note: When importing using the from keyword, do not use the
module name when referring to elements in the module. Example:
person1["age"], not mymodule.person1["age"]
END

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