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Variables and Syntax in Python

We'll learn the syntax and variables used in Python.

Printing in Python​

Python has a very simple and clean syntax, which makes it beginner-friendly.

print("Hello, World!")

Thus prints - Hello, World! Input and Output :

name = input("Enter your name: ")
print("Hello,", name, "! Welcome!") 
#Enter your name: Rohan
#Hello, Rohan"! Welcome!

Variables​

In Python, we assign variables some value. Below are a few examples.

x = 10           # int
pi = 3.14        # float
name = "Zarine"  # str
is_ok = True     # bool

💡 In Python, variables are case-sensitive (Name and name are different).

Multiple Assignment​

This is how we assign multiple variables at the same time!


a, b, c = 1, 2, 3
x = y = z = 0   # all assigned to 0

Naming Rules​

There are some rules to be followed while naming a variable.

  • Can contain letters, numbers, and underscores.
  • Cannot start with a number.
  • Keywords like for, if, while cannot be used as variable names.

Valid examples:


user_name = "Alice"
marks1 = 90
_total = 100

Invalid:


1value = 5       # ❌ cannot start with number
for = 10         # ❌ cannot use keyword

Comments​

Single line:


# This is a comment

Multi-line (docstring style):


"""
This is a 
multi-line comment
"""

📝 Quick Exercise​

Create three variables: age, pi, student_name. Assign appropriate values and print them.