+- Python Forum (https://python-forum.io)
+-- Forum: Python Coding (https://python-forum.io/forum-7.html)
+--- Forum: Homework (https://python-forum.io/forum-9.html)
+--- Thread: create function let_to_num() (/thread-8301.html)
create function let_to_num() - Truman - Feb-13-2018
let_to_num() takes input of a single letter, space or empty string stored in an argument variable: letter
use while key < 10: to try numbers 0 - 9 as index for phone_letters ("key" = phone dial pad key)
check if letter variable is in the index of phone_letters[key]
key = 0
while key < 10:
if # Create Code: determine if letter is **
in** any of the phone_letters[key] where key is the index 0 -9:return key
else:
key = key + 1
return "Not Found"
return the number or "Not Found"
call let_to_num() to test the function so it prints the argument and return value with:
space
lowercase letter
different letter, uppercase
a number
my code:
phone_letters = [' ', '', 'ABC', 'DEF', 'GHI', 'JKL', 'MNO', 'PQRS', 'TUV', 'WXYZ']
def let_to_num(letter):
letter=input("Enter single letter, space or empty: ")
key = 0
while key < 10:
for letter in phone_letters:
if l in letter:
return (phone_letters.index(letter))
else:
key = key + 1
else:
print("Not found")
print(let_to_num(letter))
Whatever character that I add it prints 9. I'm not sure that I even understand the task, your opinion is appreciated.
RE: create function let_to_num() - ka06059 - Feb-15-2018
lets assume no semantic error....
phone_letters = [' ', '', 'ABC', 'DEF', 'GHI', 'JKL', 'MNO', 'PQRS', 'TUV', 'WXYZ']
def let_to_num(): #letter argument removed, input() will do the job
letter=input("Enter single letter, space or empty: ")
key = 0
while key < 10: # 'for letter in phone_letters' loop not needed, this line will loop along phone_letters anyway
if letter in phone_letters[key]:
return key #key is the index itself
else:
key = key + 1
return ("Not found") #should return 'not found' instead, it will be printed in line 11
print(let_to_num())Output:Enter single letter, space or empty: D
3
Enter single letter, space or empty: Q
7