TypeError: get_formatted_name() missing 1 required positional argument: 'last_name'

[tjnichols]

This is my code...

def get_formatted_name(first_name, middle_name, last_name):
    """Return a full name, neatly formatted."""
    if middle_name:
        full_name = first_name + ' ' + middle_name + ' ' + last_name
    else:
        full_name = first_name + ' ' + last_name
    return full_name.title()

musician = get_formatted_name('john', 'lee', 'hooker')
print(musician)

musician = get_formatted_name('jimi', 'hendrix')
print(musician)

This is what I get...

Error:
John Lee Hooker
Traceback (most recent call last):
  File "C:/Python Tutorials/formatted_name.py", line 12, in <module>
    musician = get_formatted_name('jimi', 'hendrix')
TypeError: get_formatted_name() missing 1 required positional argument: 'last_name'

As you can see it works for John Lee Hooker. This is because it has first, middle and last names. The second Jimi Hendrix, doesn't work (I think) because it's missing a middle name.

As always any help is most appreciated!!