[Python] python : the longest word in a string

I'm developing a function that returns the longest word from a string, my code is :

def longestWord(sen):
max = 1
i = 0
ind = 1
while ind != 0 :
if sen == " ":
i = i+1
word = ""
lenth = 0

while(sen != " " and i < len(sen)):
word = word + sen
lenth = lenth+1
if(lenth > max):
max = lenth
longestword = word
i = i+1
if i == len(sen)-1:
ind = 0



return longestword

print(longestWord("ceci est un texte"))


When I try to run it an error shows up saying that "string index out of range"

The error message:

Traceback (most recent call last):
File "C:\Users\pc\PycharmProjects\pythonProject2\venv\tp2\longestWord.py", line 25, in <module>
print(longestWord("ceci est un texte"))
File "C:\Users\pc\PycharmProjects\pythonProject2\venv\tp2\longestWord.py", line 11, in longestWord
while(sen != " " and i < len(sen)):
IndexError: string index out of range

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