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Python Variables Explained: From Basics to Best Practices 2025

Python variables are one of the most essential elements in Python programming. You need to know about some rules first before using Python Variables. 

 

Rules of Python Variables

  • Must start with a letter (a-z, A-Z) or an underscore (_).
  • It cannot start with a digit (0-9).
  • Can contain letters, digits, and underscores after the first character.
  • Case-sensitive: myVar, Myvar, and myvar are treated as different variables.
  • Cannot contain spaces: Use underscores (_) instead (e.g., my_variable).
  • Cannot use Python keywords or reserved words (e.g., def, for, while, class, etc.).
  • Should not contain special characters such as @, #, $, %, etc.
  • No length limit, but keeping variable names concise and readable is recommended.
  • Variables are assigned dynamically: You don’t need to declare variable types, as Python assigns the type based on the value provided.
  • Underscore _ has a special meaning: It’s often used as a “throwaway” variable or to denote private class variables.

 

Start Programming

x = 5
y = “John”
print(x)       # Result:5
print(y)       # Result:John

 
 
 

x = 4          # x is int type
x = “Sally”  # x is str type
print(x)       # Result:4

 
 
 

x = 5
y = 10
print(x + y)   # Result:15

 
 
 

x = “5”
y = “John”
print(x + y)       # Result:5John

 
 
 

 

Python variables PY File

 
 
 

x = str(3)    # x will be ‘3’
y = int(3)    # y will be 3
z = float(3)  # z will be 3.0
print(x)       # Result:3
print(y)       # Result:3
print(z)       # Result:3.0

 
 
 

x, y, z = “Orange”, “Banana”, “Cherry”
print(x)       # Result:Orange
print(y)       # Result:Banana
print(z)       # Result:Cherry

 
 
 

# Many Values to Multiple Variables
x = y = z = “Orange”
print()         # Result: NewLine Print
print(x)       # Result:Orange
print(y)       # Result:Orange
print(z)       # Result:Orange

 
 
 

# Unpack a Collection
fruits = [“apple”, “banana”, “cherry”]
x, y, z = fruits
print(x)       # Result:apple
print(y)       # Result:banana
print(z)       # Result:cherry

 
 
 

# Output Variables
x = “Python”
y = “is”
z = “awesome”
print(x, y, z)       # Result:Python is awesome

 
 
 

# Global Variables
# def myfunc(): defines a function named myfunc.
x = “awesome”
def myfunc():
  print(“Python is ” + x)
myfunc()

 
 
 

Python Variables

 
 
 

# Global and Local Variables
x = “awesome”
def myfunc():
  x = “fantastic”
  print(“Python is ” + x)
myfunc()
print(“Python is ” + x)

 

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