Python Basics

Python Basics — cheat sheet

Use these building blocks to write small Python programs that are clear and easy to test.

Printing

print("Hello, World!")

Display text inside quotes.

print("Score:", 10)

Print several values with spaces between them.

print("red", "blue", sep=" | ")

Choose the separator between printed values.

print("Loading", end="... ")
print("done")

Change what print adds at the end.

# Explain why this code exists
print("Ready")

Python ignores text after # on a line.

if True:
    print("Indented")

Indent four spaces inside a code block.

total = (10 + 20 +
         30)

Parentheses let a long expression continue on another line.

"""A note that spans
multiple lines."""

Triple quotes create a multi-line string.

city = "Dhaka"
print(city)

Assign a value to a descriptive name.

level = 1
level = 2

A later assignment replaces the earlier value.

first_name, age = "Asha", 12

Assign several names and values at once.

left, right = right, left

Swap two existing values in one assignment.

player_score = 0

Use lowercase names with underscores for clarity.

MAX_LIVES = 3

ALL_CAPS signals a value that should not change.

name = "Mina"

A quoted value written directly in code is a literal.

score = 10

Names cannot start with a digit or use a dash.

print(type(42))

Check the type of a value.

count = int("7")

Turn whole-number text into an integer.

price = float("2.5")

Turn numeric text with a decimal into a float.

label = str(7)
is_ready = bool(1)

Convert values to text or a Boolean when needed.