9 Python Errors That Signal You’re Still a Beginner.

Python is popular, but even experts make mistakes. Here are 9 common Python errors, explained with examples, to help new coders

1. Pythonic Idioms Ignored:

• Wrong: Looping with for to create a list.

squares = []
for i in range(5): squares.append(i**2)

• Right: Embrace Pythonic list comprehensions.

squares = [i**2 for i in range(5)]

2. Mutable Defaults Misused:

• Wrong: Default list in function arguments.

def add_item(item, list=[]): list.append(item)

• Right: Use None and initialize inside.

def add_item(item, list=None):
    if list is None: list = []
    list.append(item)

3. ‘is’ Operator Confusion:

• Wrong: Using ‘is’ for value equality.

if a_list is another_list: ...

• Right: Use ‘==’ for equality checks.

if a_list == another_list: ...

4. Indentation Errors:

• Wrong: Misaligned indentation.

def example():
print("Oops!")

• Right: Correctly indented code.

def example():
    print("Correct!")