Validating string input and concatenating it to a list

Question

studentNumber = len(age) - 1
age[studentNumber] = 0
house[studentNumber] = ''
reactionTime[studentNumber] = 0

while True:
  try:
    age[studentNumber] = int(input("What is the age of the student: "))
  except ValueError:
    age[studentNumber] = int(input("What is the age of the student: "))

  if age[studentNumber] in range(12, 17):
    break

house[studentNumber] = input("Which house is the student in (Saturn/Mars): ").lower()
while house[studentNumber] not in {"saturn", "mars"}:
  house[studentNumber] = input("Which house is the student in (Saturn/Mars): ").lower()

age.append(0)
house.append('')
reactionTime.append(0)

print(age + " " + house + " " + reactionTime)

I'm trying to validate the input as a string that is "saturn"or "mars", but I'm receiving the error TypeError: can only concatenate list (not "str") to list when I try to add it to my list

The command line:

What would you like to do:
1. Enter new information
2. House-based statsitics
3. Specific Criteria statistics
Enter 1 2 or 3:  1
What is the age of the student:  12
Which house is the student in (Saturn/Mars):  saturn
Traceback (most recent call last):
  File "python", line 46, in <module>
  File "python", line 32, in newInfo
TypeError: can only concatenate list (not "str") to list

Please post all of your code. None of the code you posted can raise the error you're getting. — Loocid
– Loocid, Commented Oct 2, 2018 at 6:11
@YousifAlnajjar Are age, house and reactionTime all lists? In the updated code you have posted they are undefined. — Matthew Smith
– Matthew Smith, Commented Oct 2, 2018 at 6:17
I think age + " " + house + " " + reactionTime is supposed to be age[studentNumber] + " " + house[studentNumber] + " " + reactionTime[studentNumber]? — Aran-Fey
– Aran-Fey, Commented Oct 2, 2018 at 6:18

blhsing · Accepted Answer · 2018-10-02 06:18:52Z

2

age, house and reactionTime are lists and cannot be concatenated with strings.

You should zip the three lists and iterate through the items for output.

Change:

print(age + " " + house + " " + reactionTime)

to:

for a, h, r in zip(age, house, reactionTime):
    print(a, h, r)

answered Oct 2, 2018 at 6:18

blhsing

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