Python Cheat Sheet

From basics to advanced — Python at your fingertips.

Python Cheat Sheet by InterviewZilla

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🔹 Basics

1. Print & Comments

python
# Printing a simple message
print("Welcome to InterviewZilla!")


""" Multi-line comment or docstring
Used for documentation """

2. Variables

python
# Assigning values to variables
x = 10
name = "InterviewZilla"
active = True


print(name, "rocks!")

3. Multiple Assignment

python
# Assign multiple variables in one line
a, b, c = "Python", "Data", "InterviewZilla"
print(a, b, c)

4. Data Types

python
# Integer, Float, String, Boolean
num = 100
price = 99.9
brand = "InterviewZilla"
active = True


print(type(price))

🔹 Strings & Collections

5. String Methods

python
s = "interviewzilla"
print(s.upper()) # INTERVIEWZILLA
print(s.title()) # Interviewzilla

6. String Formatting

python
name = "Om"
print(f"Hello {name}, Welcome to InterviewZilla!")

7. Lists

python
topics = ["Python", "Spark"]
topics.append("InterviewZilla")
print(topics)

🔹 Virtual Environment & Pip

33. Virtual Env

bash
python -m venv env
source env/bin/activate

34. Install Package

bash
pip install requests

🔹 Popular Libraries

35. NumPy

python
import numpy as np
arr = np.array([1,2,3])
print(arr.mean())

36. Pandas

python
import pandas as pd
df = pd.DataFrame({"Brand":["InterviewZilla"]})
print(df)

37. Requests

python
import requests
r = requests.get("https://api.github.com")
print(r.status_code) # 200 if successful

38. JSON

python
import json
data = {"brand": "InterviewZilla"}
print(json.dumps(data))

🔹 Extras

39. f-strings

python
brand = "InterviewZilla"
print(f"Best brand: {brand}")

40. Slicing

python
s = "InterviewZilla"
print(s[:9]) # Interview

41. Type

python
x = 10
print(type(x)) #

42. Round

python
pi = 3.14159
print(round(pi, 2)) # 3.14

43. Sorted

python
nums = [3,1,2]
print(sorted(nums))

44. Map

python
nums = [1,2,3]
print(list(map(lambda x: x*2, nums)))

45. Filter

python
nums = [1,2,3,4]
print(list(filter(lambda x: x%2==0, nums)))

46. Range

python
for i in range(5):
print(i)

47. Help

python
help(len) # Shows documentation for len()

48. Dir

python
print(dir(str)) # Lists all attributes of string class

49. Import Alias

python
import numpy as np
print(np.pi)

50. With Context

python
with open("iz.txt") as f:
print(f.read())