Python Functions: `return None` vs. `return` vs. No `return` - When to Use Which?

Python Return Syntax: None vs. No Return

Python functions can return values or conclude without returning anything. While these actions may appear similar, there are subtle differences and preferred use cases for each syntax.

return None

"my_func1" explicitly returns "None" to indicate that it's meant to return a value, albeit that value is empty. This is useful when the function could potentially return different values, but in this case happens to return nothing.

return

"my_func2" uses "return" without an argument, signaling an early exit from the function. It's equivalent to "break" in loops, primarily used when exiting a function is the intended action and no return value is needed.

No Return

"my_func3" does not include a "return" statement at all. By default, Python functions return "None" if no value is explicitly returned. This is useful when the function serves as a standalone action and its completion indicates success.

Usage Recommendations

return None is appropriate when:

• The function is expected to return a value, even if that value is None.
• None is a valid and meaningful return value.

return is advisable when:

• The function should exit prematurely.
• No return value is necessary.

No return is suitable when:

• The function's completion alone signifies success.
• No return value is expected or meaningful.

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