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!")

5. Variable Scope Oversight:

• Wrong: Accessing local variables outside.

def func(): x = 10
print(x)

• Right: Define and return variables appropriately.

def func():
    x = 10
    return x
print(func())

6. Global Variable Overuse:

• Wrong: Modifying globals inside functions.

x = 5
def change(): x = 10

• Right: Pass and return values.

x = 5
def change(x): return x + 5
x = change(x)

7. Ignoring Exception Handling:

• Wrong: Dividing by zero without handling.

print(10/0)

• Right: Use try-except for error handling.

try: 
  print(10/0)
except ZeroDivisionError: 
  print("Can't divide by zero.")