Indentation

Python, unlike most other programming languages, enforces strict rules on indenting lines of code. This concept derives again from Guido's desire to produce clean, readable code. When creating functions, or using for loops or if...else statements, indentation is required on the succeeding lines of code. If a for loop is included inside an if...else statement, there will be two levels of indentation. New programmers generally find it to be helpful, as it makes it easy to organize code. A lot of programmers new to Python will create an indentation error at some point, so make sure to pay attention to the indentation levels.