02-01: Basic Syntax¶

Python syntax is the set of rules that define how Python code is written and interpreted.

print() Function¶

Used to display output on the screen.

Example:¶

print("Hello, World!")

or,

print('Hello, World!')

Explanation:

print() is a built-in function
Text inside quotes is called a string
can be used both single or double quote

👉 Output:

Hello, World!

input() Function¶

The input() function is used to take input from the user.

Example¶

name = input("Enter your name: ")
print(name)

👉 Sample run:

Enter your name: Imran
Imran

Explanation:

input() waits for user input
The text inside " " is a prompt
The entered value is stored in the variable

⚠️ Important: input() Always Returns String

age = input("Enter your age: ")
print(type(age))

👉 Sample run:

Enter your age: 25
<class 'str'>

👉 Even a number is entered, it will be stored as a string

Comments¶

Comments are used to explain code. They are ignored by Python.

Single-line comment: # is used for comment

Example¶

# This is a comment
print("Hello")

👉 Output:

Hello

Inline comment:

print("Hello")  # This prints Hello

Indentation (VERY IMPORTANT)¶

Python uses indentation (spaces) to define blocks of code.

Example:¶

age = 18

if age >= 18:
    print("Adult")

👉 Output:

Adult

Explanation:

The indented line belongs to the if block
Without indentation → ❌ Error

❌ Wrong:¶

if age >= 18:
print("Adult")

IndentationError: expected an indented block after 'if' statement

Case Sensitivity¶

Python is case-sensitive.

Example:¶

name = "Imran"
Name = "Jahid"

print(name)
print(Name)

👉 Output:

Imran
Jahid

👉 These are treated as different variables

Statements & Lines¶

Each line is usually one statement.

Example:¶

x = 10
y = 20
print(x + y)

👉 Output:

Multiple Statements in One Line¶

Multiple statements in single line can be written ; (but not recommended).

x = 10; y = 20; print(x + y)

👉 Output:

👉 Better to use separate lines for readability

Line Continuation¶

Used to break long lines into multiple lines.

Using backslash:

total = 10 + 20 + 30 + \
        40 + 50

Using parentheses (recommended):

total = (10 + 20 + 30 +
         40 + 50)

Strings and Quotes¶

Strings can be written using both double and single quote:

"Hello"
'Hello'

Multi-line string is written within triple quotes:

text = """This is
a multi-line
string"""

or,

text = '''This is
a multi-line
string'''

Basic Output Formatting¶

🔹 1. Comma Formatting (Basic Print)¶

name = "Imran"
print("Name:", name)

👉 Output:

Name: Imran

"Name:" → string (fixed text)
name → variable
, → separates items in print()

🔹 2. f-String Formatting (Modern Way)¶

age = 25
print(f"My age is {age}")

👉 Output:

My age is 25

f"" → formatted string
"My age is " → string
{age} → variable inserted inside string
👉 Python replaces {age} with its value

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Exercises: 02-01: Exercises — Basic Syntax

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