How to name any elements of a list

[Marcozeus]

Hi, I have some problem with my code:

from time import*
from turtle import*
 
 
mot = input("Quel est votre mot?")
longueurMot = len(mot)
lettre = list(mot)
 
a = 0
b = -1
while a != longueurMot:
    a = a +1
    b = b +1
    down()
    forward(100)
    left(90)
    forward(50)
    left(90)
    forward(100)
    left(90)
    forward(50)
    left(90)
    up()
    forward(50)
    left(90)
    forward(25)
    write(lettre[b])
    left(180)
    forward(25)
    left(90)
    forward(150)
lettreEntrée = input("Entrez une lettre svp.")
while lettreEntrée != lettre[]:
    print("Cette lettre ne fait pas partie du mot. Réessayez.")
    lettreEntrée = input("Entrez une lettre svp.")
    if lettreEntrée == lettre[]:
        break
 

When I ask to write a letter, I want to know if this letter is in my list. If not, I want to print : This letter is not in my word.

P.S.: I am french so sorry if you don't understand some words :)

[bvdet]

The "in" operator can be applied to a sequence such as a string or list.

>>> word = "example"
>>> if "e" in word:
...     print "This letter is in my word"
... else:
...     print "This letter is not in my word"
...     
This letter is in my word
>>> 

[Marcozeus]

Thank you very much :D