packages

Packages:
Collection of modules is called packages.

Like modules, packages also reusability concept in python.
A package is basically a folder/directory which contains the python files. A file with the name (double underscore before and after init) __init__.py should be there in the directory.

Why __init__.py files should be there in the package?

Every directory inside python path, which contains a file init.py, then only that directory will be treated as package by Python interpreter.

A package may contain no of modules.

How to create the packages in our project:
1. Create any folder (directory) Example : escpack
My workspace: F:\Programs\escpack
We can give any name, preferable give related name which suits to our project.
2. Go to that package (i.e escpack) create any module (which contains classes, functions and variables),
3. Create an __init__.py file inside our package i.e escpack. Python interpreter knows that it is a package. Init.py is a empty file.
4. In that package, create any module. Ex:module1.py
def f1():
print(“Module1 from escpack”)
5. Save the above code in that package folder.
6. Come out of the package i.e escpack. (don’t go for another directory)
7. Create one python file to test our package
Example:
import escpack.module1 as m
##escpack.module1.f1()
m.f1()

"""
Module1 from escpack
"""
In case of other directory if you want to use escpack. i.e f:\Programs\functions

import sys
sys.path.append('f:\Programs\escpack')
import module1 as m
m.f1()
"""
Module1 from escpack
"""
8.Another way to use packages
#Import escapck.module1
from escpack.module1 import f1
f1()

Nested packages also available.