Reduce a while-loop condition - python-CodePudding

I'm trying to create a constraint so that the "lettera" input variable is a letter of the alphabet between a and h on this code *1 but I think there's a better way to write the condition for the loop.

Thanks if someone could help me figuring out how re-write it smaller.

while (lettera != 'a' and lettera != 'b' and lettera != 'c' and lettera != 'd' and lettera != 'e' and lettera != 'f' and lettera != 'g' and lettera != 'h'):
    lettera= input('Inserisci un valore lettera a-h ')

CodePudding user response：

while lettera not in 'abcdefgh':

CodePudding user response：

you could use python's ord() function to get the ascii code of a letter / character and check against a range, a-h are 97-104.

CodePudding user response：

lettera= input('Inserisci un valore lettera a-h ')
ttt = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
b = all([x != lettera for x in ttt])
while b == False:
    print(b)

CodePudding user response：

constraint ... is a letter of the alphabet between a and h

Direct translation to Python would be

letter_a = ...
while not 'a' <= letter_a <= 'h':
    letter_a = read("Please try again: ")

This would make it easy to raise 'h' to e.g. 'n'. If any letter could be added, the answer from @yzhang is more suitable.

CodePudding user response：

flag=True
while (flag):
    lettera=input()
    ascii_val = ord(lettera)
    print(ascii_val)
    if ((ascii_val>=97) and (ascii_val<=104)):
        flag=False

CodePudding user response：

You can use filter function to filter from input

lettera= filter(lambda x: x not in "abcdefgh ", input('Inserisci un valore lettera a-h '))

print(*lettera)