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PYTHON CHEAT SHEET — Save This!
Most Asked Python in Tech Interviews!

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Python is #1 language for AI, Data Science,
Backend & Automation roles. Master this!

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DATA TYPES & BASICS

x = 10 # int
y = 3.14 # float
s = 'hello' # string
b = True # boolean
l = [1,2,3] # list (mutable)
t = (1,2,3) # tuple (immutable)
d = {'a': 1} # dictionary
st = {1,2,3} # set (unique values)

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STRINGS — Most Asked!

s = 'Hello World'
s.upper() # 'HELLO WORLD'
s.lower() # 'hello world'
s.split(' ') # ['Hello', 'World']
s.replace('o','0') # 'Hell0 W0rld'
s.strip() # remove whitespace
len(s) # 11
s[0:5] # 'Hello' (slicing)
s[::-1] # reverse string!
f'Name: {s}' # f-string formatting

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LIST OPERATIONS

l = [3, 1, 4, 1, 5]
l.append(9) # add to end
l.insert(0, 7) # insert at index 0
l.remove(1) # remove first '1'
l.pop() # remove last element
l.sort() # sort in place
sorted(l) # returns new sorted list
l.reverse() # reverse in place
len(l) # length of list
sum(l) # sum of all elements
max(l), min(l) # max and min value

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LIST COMPREHENSION — Interviewers Love!

squares = [x**2 for x in range(10)]
# [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

evens = [x for x in range(20) if x%2==0]
# [0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

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DICTIONARY TRICKS

d = {'name': 'Rahul', 'age': 22}
d['name'] # 'Rahul'
d.get('city', 'N/A') # safe get
d.keys() # all keys
d.values() # all values
d.items() # key-value pairs
d.update({'city': 'Delhi'}) # add/update

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FUNCTIONS & LAMBDA

def add(a, b):
return a + b

# Lambda (one-line function)
square = lambda x: x**2
square(5) # 25

# *args and **kwargs
def greet(*names):
for name in names:
print(f'Hi {name}')

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MUST-KNOW PYTHON CONCEPTS:

List vs Tuple -> mutable vs immutable
Deep vs Shallow copy -> copy.deepcopy()
Global vs Local -> variable scope
try/except -> error handling
with open() -> file handling
OOP: class, __init__, self, inheritance

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TOP 5 PYTHON INTERVIEW QUESTIONS:

1. Difference: list vs tuple vs set vs dict?
2. What is a lambda function?
3. How does Python handle memory management?
4. What are decorators in Python?
5. Difference: deep copy vs shallow copy?

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LeetCode -> leetcode.com
W3Schools -> w3schools.com/python

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A step by step guide to Python, a language that is easy to pick up yet one of the most powerful.

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