How does Python treat whitespace in code?

Python treats whitespace as significant, particularly when it comes to defining code blocks through indentation. In Python, the structure of the code relies on indentation levels to determine the scope of loops, functions, and conditionals, rather than using braces or other delimiters that are common in many other programming languages. This means that consistent use of whitespace is crucial for proper code execution and clarity.

For example, when defining a function or starting a control structure like a loop or an if statement, the body of that structure must be indented. If the indentation is inconsistent or incorrect, Python will raise an indentation error, indicating that it is unable to interpret the intended structure of the code. Thus, whitespace is not just aesthetic; it directly affects how the code is parsed and executed.

Therefore, proper use of whitespace in Python ensures that the code runs as intended, adhering to the block structure defined by indentation levels.