No output from print function
Question:
I am trying to create a program where a letter (in order), a,e,o,s,t, or r, is input and another letter, r,t,s,o,e, or a, is output. For example, if I were to enter a, I would receive r. I am also trying to make this case sensitive, so that if I were to input A, I would get R.
secret=input("Enter string with 1 character: ")
letter_map="aeostr"
cipher="rtsoea"
cnt=0
while cnt < 6:
if secret == letter_map[cnt]:
if str.islower(secret):
print(cipher[cnt])
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
cnt += 1
When I try to execute this line of code with an uppercase A or other string within the letter map
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
I receive a blank output. I originally tried it as
else:
print(str.upper(cipher[cnt]))
I am not sure where I went wrong, but I am coming up short.
Answers:
You should use secret.lower() == letter_map[cnt]
in first if statement.
secret=input("Enter string with 1 character: ")
letter_map="aeostr"
cipher="rtsoea"
cnt=0
while cnt < 6:
if secret.lower() == letter_map[cnt]:
if str.islower(secret):
print(cipher[cnt])
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
cnt += 1
Here’s a better version:
secret=input("Enter string with 1 character: ")
letter_map="aeostr"
cipher="rtsoea"
for cnt in range(6):
if secret == letter_map[cnt] or secret == letter_map[cnt].upper():
if str.islower(secret):
print(cipher[cnt])
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
As Abdul Aziz pointed out, the issue is with the first if
. letter_map
only contains lowercase letters, and in Python, uppercase doesn’t match lowecase; this can be a source of frustration to new Pythoners coming from languages where lowercase does match uppercase. I also changed the while
loop as it makes a little better sense among intermediate Python programmers.
You don’t need a loop at all (unless I’m misunderstanding the functionality). Surely it’s just a matter of…
if secret := input("Enter string with 1 character: "):
secret = secret[0] # ensure only one character
letter_map = "aeostr"
cipher = "rtsoea"
if (i := letter_map.find(secret)) >= 0:
print(cipher[i])
elif (i := letter_map.upper().find(secret)) >= 0:
print(cipher.upper()[i])
else:
print('Invalid input')
Or…
if secret := input("Enter string with 1 character: "):
letter_map = "aeostr"
letter_map += letter_map.upper()
cipher = "rtsoea"
cipher += cipher.upper()
if (i := letter_map.find(secret[0])) >= 0:
print(cipher[i])
else:
print('Invalid input')
I am trying to create a program where a letter (in order), a,e,o,s,t, or r, is input and another letter, r,t,s,o,e, or a, is output. For example, if I were to enter a, I would receive r. I am also trying to make this case sensitive, so that if I were to input A, I would get R.
secret=input("Enter string with 1 character: ")
letter_map="aeostr"
cipher="rtsoea"
cnt=0
while cnt < 6:
if secret == letter_map[cnt]:
if str.islower(secret):
print(cipher[cnt])
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
cnt += 1
When I try to execute this line of code with an uppercase A or other string within the letter map
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
I receive a blank output. I originally tried it as
else:
print(str.upper(cipher[cnt]))
I am not sure where I went wrong, but I am coming up short.
You should use secret.lower() == letter_map[cnt]
in first if statement.
secret=input("Enter string with 1 character: ")
letter_map="aeostr"
cipher="rtsoea"
cnt=0
while cnt < 6:
if secret.lower() == letter_map[cnt]:
if str.islower(secret):
print(cipher[cnt])
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
cnt += 1
Here’s a better version:
secret=input("Enter string with 1 character: ")
letter_map="aeostr"
cipher="rtsoea"
for cnt in range(6):
if secret == letter_map[cnt] or secret == letter_map[cnt].upper():
if str.islower(secret):
print(cipher[cnt])
else:
upper_ver = str.upper(cipher[cnt])
print(upper_ver)
As Abdul Aziz pointed out, the issue is with the first if
. letter_map
only contains lowercase letters, and in Python, uppercase doesn’t match lowecase; this can be a source of frustration to new Pythoners coming from languages where lowercase does match uppercase. I also changed the while
loop as it makes a little better sense among intermediate Python programmers.
You don’t need a loop at all (unless I’m misunderstanding the functionality). Surely it’s just a matter of…
if secret := input("Enter string with 1 character: "):
secret = secret[0] # ensure only one character
letter_map = "aeostr"
cipher = "rtsoea"
if (i := letter_map.find(secret)) >= 0:
print(cipher[i])
elif (i := letter_map.upper().find(secret)) >= 0:
print(cipher.upper()[i])
else:
print('Invalid input')
Or…
if secret := input("Enter string with 1 character: "):
letter_map = "aeostr"
letter_map += letter_map.upper()
cipher = "rtsoea"
cipher += cipher.upper()
if (i := letter_map.find(secret[0])) >= 0:
print(cipher[i])
else:
print('Invalid input')