Module 3

Common loop mistakes

Errors to watch out for.

Three common mistakes

Here are three mistakes that beginners often make with loops.

PythonThree common mistakes.

# Mistake 1: forgetting to update the variable
# while count < 3:
#     print(count)    infinite loop!

# Mistake 2: wrong indentation
# for i in range(3):
# print(i)            IndentationError

# Mistake 3: off-by-one with range
# range(3) gives 0, 1, 2 (not 3)

→

What causes an infinite loop?

3.10 · Nested repetition, introductory 3.12 · Module challenge