Python Cheat Sheet

Core Python syntax, data types, and common libraries.

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Core Types Functions Data Structures Classes
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Core Types

Concept / Tag Code Snippet Description
List Comp 
new_list = [x for x in old if x > 0]
 Powerful collection building.
Dict Comp 
{k: v for k, v in zip(keys, vals)}
 One-line dictionaries.

Functions

Concept / Tag Code Snippet Description
Args/Kwargs 
def fn(*args, **kwargs): ...
 Variable arguments.
Lambda 
square = lambda x: x ** 2
 Anonymous functions.

Data Structures

Concept / Tag Code Snippet Description
Set 
unique = set([1, 1, 2])
 Unique values only.

Classes

Concept / Tag Code Snippet Description
Init 
def __init__(self, name): self.name = name
 Constructor method.
Str Method 
def __str__(self): return self.name
 Printable representation.

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