Как удалить последнее слово из строки в Python

Thank you, for your example.

text = "hello world"
print('' if ' ' not in text else text.rsplit(' ', 1)[0])

# [] излишни
listToStr = ' '.join(str(elem) for elem in rm)

>>> text = 'hello world'
>>> ' '.join(word for word in text.split()[:-1])
'hello'
>>> def remove_last_word(text):
...     return text and ' '.join(word for word in text.split()[:-1])
...
>>> remove_last_word(None)
>>> remove_last_word('hello')
''
>>> remove_last_word('hello world')
'hello'
>>> remove_last_word('some other test string')
'some other test'