What happens when a function returns none?

What happens when a function returns none?

Functions in Python return None if there is no return statement and you only return in the else branch of your program.

What is none in Python function?

The None keyword is used to define a null value, or no value at all. None is not the same as 0, False, or an empty string. None is a data type of its own (NoneType) and only None can be None.

Does a Python function need a return?

A Python function will always have a return value. There is no notion of procedure or routine in Python. So, if you don’t explicitly use a return value in a return statement, or if you totally omit the return statement, then Python will implicitly return a default value for you.

Can I return 0 in Python?

Function Return 0 in Python if assign a value is 0 and the function will end when the return keyword and value is reached.

Is none and null same?

None means Nothing, Nothing is a concept that describes the absence of anything at all. Nothing is sometimes confused with Null, but they are very different concepts because Nothing means absence of anything, while Null means unknown (you do not know if there is a thing or not).

Can I return none in Python?

There is no such thing as “returning nothing” in Python. Every function returns some value (unless it raises an exception). If no explicit return statement is used, Python treats it as returning None .

Do functions always need a return?

NO, a function does not always have to have an explicit return statement. If the function doesn’t need to provide any results to the calling point, then the return is not needed.

Do functions always need to return something?

No. A function does not need to return a value always. If the return type is void, then return is not needed. If the return type is non-void such as int, then return is strictly needed.

What is Python return?

The Python return statement is a special statement that you can use inside a function or method to send the function’s result back to the caller. A return statement consists of the return keyword followed by an optional return value. The return value of a Python function can be any Python object.

How does Python handle none?

Checking if a variable is None using is operator:

1. # Declaring a None variable. var = None.
2. # Declaring a None variable. var = None.
3. # Declaring a variable and initializing with None type.
4. # Comparing None with none and printing the result.
5. # Comparing none with False and printing the result.
6. # Declaring an empty string.

How do I remove none from function in Python?

Use filter() to remove None from a list in Python

1. print(list_of_values) [1, 2, None, 3, None]
2. Not_none_values = filter(None. __ne__, list_of_values)
3. list_of_values = list(Not_none_values)
4. print(list_of_values) [1, 2, 3]