Python Error Types

Syntax Error

Occurs when Python encounters code that violates its syntax rules.

Example of Syntax Error

print("Hello World") - The closing quote is missing.

Indentation Error

Occurs when the code is not properly indented, breaking Python’s strict indentation rules for blocks.

Example of Indentation Error

for i in range(5): print(i) - The print statement should be indented under the for loop.

Name Error

Happens when a variable or function is used before it is defined.

Example of Name Error

print(myvariable) - myvariable is not defined before it is used.

Type Error

Raised when an operation is performed on incompatible data types.

Example of Type Error

result = 5 + "10" - Cannot add an integer (5) and a string ("10").

Attribute Error

Occurs when a non-existent attribute is accessed on an object.

Example of Attribute Error

text = "Hello"; text.append(" World") - Strings do not have an append() method.

Value Error

Happens when a function receives an argument of the correct type but an inappropriate value.

Example of Value Error

number = int("Hello") - The string "Hello" cannot be converted to an integer.

Index Error

Occurs when trying to access an element of a list or tuple that is out of range.

Example of Index Error

mylist = [1, 2, 3]; print(mylist[3]) - The list has only three elements (indices 0, 1, and 2).

Import Error

Occurs when an imported module cannot be found or cannot be loaded.

Example of Import Error

import nonexistentmodule - The specified module does not exist.