Input as not default method parameter

[snippsat]

As mention input name is used,if not sure of build in names test it.

# Also not okay name is used 
>>> input
<built-in function input>

# foo can be use get a NameError
>>> foo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'foo' is not defined

name 'foo' is not defined

What´s the variable of that input? How can I use it´s value inside that function?

It can be None or any that user give that's the point of default arguments.

def function(param1, my_input=""):
    if my_input == '':
        return f'No argument given so i just return <{param1}> and <{repr(my_input)}>'
    return f"Ohh user want something else than '' so i return <{param1}> and <{my_input}"

Use:

# Will not get a error if give one argument
>>> function('hello')
"No argument given so i just return <hello> and <''>"

>>> function('hello', 999)
"Ohh user want something else than '' so i return <hello> and <999>"
>>> function('hello', 'world')
"Ohh user want something else than '' so i return <hello> and <world>"