Python module 3, b.tech 5th semester ppt

Python module 3, b.tech 5th semester ppt

• 1.
  Course Title: Programmingin Python Course Code: BTAIML501- 20 Module: 3
• 2.
  Module Definition A modulein Python is simply a file containing Python code. It can include functions, classes, or variables. Modules help in organizing the code by dividing it into multiple files, making it reusable and easier to manage. Need of Modules Modules are needed to keep the code modular, reusable, and maintainable. By using modules, we can avoid writing the same code repeatedly and can easily manage large codebases.
• 3.
  Creating a Module Tocreate a module, you simply create a Python file with a .py extension. For example, if you create a file named mymodule.py, it becomes a module. Example: # mymodule.py def greet(name): print(f"Hello, {name}!") Importing Module To use a module in your program, you need to import it using the import keyword. This allows you to access the functions, classes, or variables defined in that module.
• 4.
  Example: # main.py import my_module #Calling the functions from the module greeting = my_module.greet("Alice") print(greeting) # Output: Hello, Alice! Path Searching of a Module When you import a module, Python searches for it in certain directories. The search path includes the current directory, directories listed in the environment variable PYTHONPATH, and the standard library directories. Example import sys # Print the list of paths where Python searches for modules for path in sys.path: print(path) This will display all the directories where Python looks for modules, including the current working directory, site- packages, and other system-specific paths. sys.path = System Specific Paths sys = module by default
• 5.
  Module Reloading If amodule has already been imported and you want to reload it (in case of changes), you can use importlib.reload(). This forces Python to reload the module. Example import importlib import mymodule importlib.reload(mymodule) # Reload the module after making changes Standard Modules Python comes with a large library of standard modules like math, os, sys, datetime, etc. These are pre- installed modules that help in various tasks like mathematical operations, file handling, etc. output /home/user/project /usr/lib/python3.9 /usr/lib/python3.9 /lib-dynload/usr /local/lib/python3.9/dist-packages
• 6.
  Example import math print(math.sqrt(16)) #Prints 4.0 Python Packages A Python package is a collection of modules. A package is structured with directories and a special __init__.py file. Packages help in organizing modules hierarchically Example # Directory structure for a package: # mypackage/ # __init__.py # module1.py # module2.py