Python - Building Blocks of Python

Functions:

• Group of statements that performs a specific task.

• Syntax:

    def function_name(parameters):
        statement(s)
        return result
  

Modules:

• A module is a file containing the python definitions & statements.
• Modules have .py extensions and help us logically organize the code.
• Example:
  • my_module.py

    def greet(name):
    print(f"Hello {name} , Welcome !!!")
    age = 25
    

  • main.py

    import my_module
    my_module.greet("John")
    print(my_module.age)
    

Classes:

• A class is user-defined blueprint or prototype from which objects are created.
• Objects:
  • A instance of a class with values
• Class Attributes:
  • Reflects the properties of an Objects
• Class Methods:
  • Reflects the behaviour of objects
• Sytax:

  class MyClass:
    # Class varaible
    class_variable = "I am a class variable"
  
    # Constructur (initializer) method
    def __init__(self, attribute1, attribute2):
      self.attribute1 = attribute1
      self.attribute2 = attribute2
        
    # Instance Method
    def display_attributes(self):
      print(f"Attribute 1: {self.attribute1})"
      print(f"Attribute 2: {self.attribute2})"
        
    # Another Instance Method
    def modity_attributes(self, new_value1, new_value2):
      self.attribute1 = new_value1
      self.attribute2 = new_value2
  
    
  # Creating Objects from Class
  
  # Creating objects:
  obj1 = MyClass("john","doe")
  obj2 = MyClass("kevin","shark")
  
  # Accessing attributes and method
  print(obj1.attribute1)
  obj2.attribute1
  
  # Modifying the objects
  obj1.modity_attributes("jane","smith")
  

Scripts:

Libraries:

• Library is a collection of modules that provides pre-written and reusable code to perform specific tasks.
• Example:

  import pandas as pd
  pd.read_csv("dataset.csv")
  

Python Packages