In Python, a SyntaxError happens when the interpreter finds code that does not conform to the rules of the Python language.

Python lets you set default values for function arguments, which is super convenient. But when those default values are mutable (like lists or dictionaries), you're walking into a sneaky bug trap.

Python Functions: Python Functions, Function Argument, Python Recursion Anonymous Function, Global, Local and Nonlocal, Python Global Keyword, Python Modules, Python Package.