Python Cheat Sheet
Python programming basics reference guide
Python Cheat Sheet
Quick reference guide for Python programming basics. Click the copy button to copy any command.
94
Total Commands
94
Filtered Results
Variables and Data Types
| Command | Copy | Description |
|---|---|---|
x = 5 | Assign integer to variable | |
name = "John" | Assign string to variable | |
is_valid = True | Assign boolean to variable | |
price = 19.99 | Assign float to variable | |
type(x) | Get type of variable | |
int(x) | Convert to integer | |
str(x) | Convert to string | |
float(x) | Convert to float |
String Methods
| Command | Copy | Description |
|---|---|---|
s.upper() | Convert string to uppercase | |
s.lower() | Convert string to lowercase | |
s.strip() | Remove leading/trailing whitespace | |
s.split(",") | Split string by delimiter | |
s.replace("a", "b") | Replace substring | |
s.startswith("pre") | Check if string starts with prefix | |
s.endswith("suf") | Check if string ends with suffix | |
s.find("text") | Find substring position | |
s.count("a") | Count occurrences of substring | |
f"Hello {name}" | Format string (f-string) | |
"{}".format(x) | Format string (format method) | |
"-".join(list) | Join list elements into string |
Lists
| Command | Copy | Description |
|---|---|---|
list = [1, 2, 3] | Create a list | |
list.append(4) | Add item to end of list | |
list.insert(0, 0) | Insert item at position | |
list.remove(2) | Remove first occurrence of value | |
list.pop() | Remove and return last item | |
list.pop(0) | Remove and return item at index | |
list.sort() | Sort list in place | |
list.reverse() | Reverse list in place | |
len(list) | Get length of list | |
list[0] | Access first element | |
list[-1] | Access last element | |
list[1:3] | Slice list (elements 1-2) | |
[x*2 for x in list] | List comprehension |
Dictionaries
| Command | Copy | Description |
|---|---|---|
dict = {"key": "value"} | Create a dictionary | |
dict["key"] | Access value by key | |
dict.get("key", default) | Get value with default | |
dict["new"] = "value" | Add or update key-value pair | |
del dict["key"] | Delete key-value pair | |
dict.keys() | Get all keys | |
dict.values() | Get all values | |
dict.items() | Get all key-value pairs | |
"key" in dict | Check if key exists |
Control Flow
| Command | Copy | Description |
|---|---|---|
if x > 0: | If statement | |
elif x == 0: | Else if statement | |
else: | Else statement | |
x if condition else y | Ternary operator |
Loops
| Command | Copy | Description |
|---|---|---|
for i in range(5): | For loop with range | |
for item in list: | For loop over list | |
for i, item in enumerate(list): | For loop with index | |
for key, value in dict.items(): | For loop over dictionary | |
while condition: | While loop | |
break | Exit loop | |
continue | Skip to next iteration |
Functions
| Command | Copy | Description |
|---|---|---|
def func(): | Define function | |
def func(arg1, arg2): | Function with arguments | |
def func(arg="default"): | Function with default argument | |
def func(*args): | Function with variable arguments | |
def func(**kwargs): | Function with keyword arguments | |
return value | Return value from function | |
lambda x: x*2 | Lambda (anonymous) function |
File I/O
| Command | Copy | Description |
|---|---|---|
open("file.txt", "r") | Open file for reading | |
open("file.txt", "w") | Open file for writing | |
open("file.txt", "a") | Open file for appending | |
f.read() | Read entire file | |
f.readline() | Read one line | |
f.readlines() | Read all lines into list | |
f.write("text") | Write to file | |
f.close() | Close file | |
with open("file.txt") as f: | Open file with context manager |
Exception Handling
| Command | Copy | Description |
|---|---|---|
try: | Try block | |
except Exception: | Catch exception | |
except ValueError as e: | Catch specific exception | |
finally: | Always execute block | |
raise Exception("error") | Raise exception |
Classes
| Command | Copy | Description |
|---|---|---|
class MyClass: | Define class | |
def __init__(self): | Constructor method | |
self.attribute = value | Instance attribute | |
obj = MyClass() | Create class instance |
Imports
| Command | Copy | Description |
|---|---|---|
import module | Import module | |
from module import func | Import specific function | |
import module as m | Import with alias | |
from module import * | Import all from module |
Common Functions
| Command | Copy | Description |
|---|---|---|
print(x) | Print to console | |
input("prompt") | Get user input | |
range(start, stop, step) | Create range object | |
len(obj) | Get length of object | |
sum(list) | Sum all items in list | |
max(list) | Get maximum value | |
min(list) | Get minimum value | |
sorted(list) | Return sorted list | |
enumerate(list) | Add counter to iterable | |
zip(list1, list2) | Combine iterables | |
map(func, list) | Apply function to each item | |
filter(func, list) | Filter items by function |
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