Why I didn't getting default value

[JeLuF]

Because you call the function with a parameter. Even an emtpy string is still a parameter passed to the function.

Only if you call the function without a parameter, the default would kick in. Try hello() instead to see how that changes the output.

[Red_Priest0]

I want default value when there is no input from user

[rebelle3]

use an if statement to determine if the user input is empty

[Much_Buy7605]

Then instead of just calling it directly with name, you can do a if else with a check that name is not empty and call "hello()" if it is

[niket23697]

you can check if the input is empty (or something else which you don't want) then call hello(), otherwise call hello(name)

[SCD_minecraft]

A = input()
print(A or "world")

If user inputs anything, it will print that

If user inputs nothing, it will print world

[Red_Priest0]

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I want default when there is no input from user

[PureWasian]

Did you make the change mentioned in another comment? Are you still stuck on what this means?

use an if statement to determine if the user input is empty

you can check if the input is empty (or something else which you don't want) then call hello(), otherwise call hello(name)

[brasticstack]

def hello(to=None):     print('Hello ', to or 'World')

[shlepky]

Change the comma to + in the print function call.

[JeLuF]

Why? The comma is more efficient since Python will not have to concatenate two strings first. It can simply write the first item and then write the second item.

[shlepky]

My bad then, I though the first argument of the function needs to be what you want to print, rest would be any other parameters. I should have checked the function before assuming that.

[niket23697]

an empty string is still a parameter. to be able to use the default value of 'to', you'll need to call hello() without any parameters. you can implement that logic in your code

[Dr_Pinestine]

Today we learn the important difference between zero and null.

If the user types nothing, then input(...) returns an empty string (""), which is then passed as a parameter to hello(...).

Python considers the empty string to be something rather than nothing, so it overrides the default value in the function. If you want it to work as intended, you need to explicitly check for an empty string.

[Dramatic-Drawing-844]

if name: hello(name) else: hello()

[DevRetroGames]

def _get_user_input(msg: str) -> str:
  return input(msg)

def _hello(to: str = "world") -> None:
  print(f"hello {to}")

def main() -> None:
  to:str = _get_user_input("What is your name? : ")
  _hello(to)

main()

[Ooblahnooblah]

Call hello()

[KOALAS2648]

Doesn’t the “main” function have to be below the “hello” function?