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Computer Science · Python
Variables & Types
• x = 5 → int
• s = "hi" → str
• arr = [1,2,3] → list
• d = {k:v} → dict
Loops
• for i in range(n):
• while cond:
• break / continue
• [x for x in arr]
Functions
• def f(x, y=0):
• return val
• *args, **kwargs
• lambda x: x+1
OOP
• class Dog:
• def __init__(self):
• self.name = name
• inheritance: (Base)
Big-O
• O(1) → hash lookup
• O(log n) → binary
• O(n log n) → sort
• O(n²) → nested loop
Key Methods
• len(arr), arr.sort()
• str.split(), join()
• dict.get(k, def)
• set(), zip(), map()
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