Importing Python Packages

The presentation gives details about the python packages , how to import packages, why do we need packages .

Transcript

1. z Python Packages
2. z Python Packages: § A package is like a folder which consists of subpackages and modules. § It helps you maintain a program structure and framework by grouping similar modules in one package. § Package is like other directories on your system. A python package has a particular file “__init__.py“ which helps python identify that it is a package. § Use default packages from python official repository. www.pypi.org
3. z When to create Python Packages? § Create package when you have to use repetitive piece of code again and again. § Packages are the code repository for managing your modules, functions and data. § Create modules when you need to share functions/ data with other team members or maybe with other python members.
4. z Importing Python Package: There are multiple ways to import python modules: § Import myPackage.myModule : Import a specific module from the respective package. § from myPackage import myModule : Alternative way of importing a specific module from the respective package. § from myPackage. myModule import func1,func2 : Import specific functions from myModule in the package.
5. z from myPackage.subpackage.myModule Import a specific module from the respective subpackage. from myPackage.subpackage.myModule import func1,func2 Import specific functions from myModule in the subpackage. from myPackage.myModule import * import all the functions and data from the module. (Works only when __all__ is defined in __init__.py file) Importing Python Package:
6. z Creating a python package: Create a folder on your machine Create a __init__.py file in the folder Create classes/modules or subpackages in the main package.
7. z Path to the package § Search Path should be till the folder containing the package. § If the package is not in the same folder as your program, then add the path to the package to PYTHONPATH.
8. z Thanks!