Python will throw a SyntaxError if you use any of the following keywords as a variable name.

See this page for more details: https://docs.python.org/3/reference/lexical_analysis.html#keywords.

• None: Represents null/empty value (x = None)
  
  
• True: Boolean true value (x = True)
  
  
• False: Boolean false value (x = False)
  

• and: Logical AND operator (if x > 0 and y > 0:)
  
  
• or: Logical OR operator (if x > 0 or y > 0:)
  
  
• not: Logical NOT operator (if not x):
  
  
• in: Membership test operator (if x in list:)
  
  
• is: Identity comparison (if x is None:)
  

• if: Conditional statement (if x > 0:)
  
  
• elif: Else if condition (elif x < 0:)
  
  
• else: Default condition (else:)
  
  
• for: For loop (for x in list:)
  
  
• while: While loop (while condition:)
  
  
• break: Exit loop (break)
  
  
• continue: Skip to next iteration (continue)
  
  
• pass: Null operation placeholder (pass)
  

• try: Begin exception handling block (try:)
  
  
• except: Handle specific exceptions (except ValueError:)
  
  
• finally: Always executed block (finally:)
  
  
• raise: Raise an exception (raise ValueError("Invalid input"))
  
  
• assert: Debug assertion (assert x > 0, "x must be positive")
  

• def: Define function (def my_function():)
  
  
• class: Define class (class MyClass:)
  
  
• return: Return value from function (return result)
  
  
• yield: Generator yield (yield value)
  
  
• lambda: Anonymous function (lambda x: x * 2)
  

• global: Declare global variable (global counter)
  
  
• nonlocal: Declare nonlocal variable (nonlocal outer_var)
  
  
• import: Import module (import math)
  
  
• from: Import specific items (from math import sqrt)
  
  
• as: Alias for imports (import numpy as np)
  

• async: Define async function (async def fetch_data():)
  
  
• await: Wait for async operation (result = await fetch_data())
  

• del: Delete object reference (del my_variable)
  

• with: Context manager (with open('file.txt') as f:)