Challenge Task step 2 None error

Question

Here is my code:
def add_list(lst):
  total = 0
  for item in lst:
   total +=item
  return total
def summarize(lst):
  print('The sum of {} is {}.'.format(str(lst), add_list(lst)))
The error is output is 'None' return instead of the required one.

Stephen Whitfield · Accepted Answer

You can make the add_list part easier:
def add_list(lst):
   return sum(lst)
def summarize(lst):
   return ('The sum of {} is {}.'.format(lst, add_list(lst)))

nvcxnvkldsjaklfds · Answer

@Mohsen Qaddoura (https://teamtreehouse.com/mohsenqaddoura)  You get output 'None'. Because you are printing in your summarize() function instead return. Function generally return 'None'. You can override that by return statement. 
Challenge 2 they are asking you to make a function summarize() that takes in list and return ""The sum of X is Y.", replacing "X" with the string version of the list and "Y" with the sum total of the list."
So you should return in summarize(). Please code below for more clarification.
```
def addlist(passlist):
  total = 0
  for item in pass_list:
      total += item
  return total
def summarize(lst): 
    return('The sum of {} is {}.'.format(str(lst), add_list(lst)))
```
I hope it helps

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Mohsen Qaddoura

Mohsen Qaddoura

Challenge Task step 2 None error

2 Answers

Stephen Whitfield

Stephen Whitfield

Mohsen Qaddoura

Mohsen Qaddoura

nvcxnvkldsjaklfds

nvcxnvkldsjaklfds

Mohsen Qaddoura

Mohsen Qaddoura

nvcxnvkldsjaklfds

nvcxnvkldsjaklfds