Python · Chapter 3 of 45
Python Syntax
Python uses indentation to group code instead of braces `{}`. Every statement in the same block must start at the same column — usually 4 spaces.
Statements normally end at the newline. Semicolons exist but are almost never used.
Indentation defines blocks
Everything inside an `if`, loop or function is indented. If you mix tabs and spaces you'll get an IndentationError.
Case sensitivity
Python is case-sensitive: `Name` and `name` are different variables. Keywords like `if`, `for`, `while` are always lowercase.
Example 1 (python)
if 10 > 5:
print("Ten is greater")Output
Ten is greaterThe indented print() belongs to the if-block.
Example 2 (python)
for i in range(3):
print(i)Output
0
1
2The body of the loop is indented under `for`.
Key points
- Indentation (usually 4 spaces) defines code blocks.
- Mixing tabs and spaces breaks the parser.
- Statements end at the newline, not with `;`.
- Python is case-sensitive.
💡 Note: PEP 8, the official style guide, recommends 4 spaces per indent — never tabs.