Values in dictionary are ints?

Question

Hi There,

When trying to create the stats function, the console returns the error "object of type int has no len()"

Code:

def stats(dicts): for i in dicts: dicts[i] = len(dicts[i]) return dicts

This code functions perfectly in the workspace and returns a dictionary with the teachers and the quantity of classes they teach. Any ideas why this doesnt work in this exercise?

Thanks

teachers.py

# The dictionary will be something like:
# {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Often, it's a good idea to hold onto a max_count variable.
# Update it when you find a teacher with more classes than
# the current count. Better hold onto the teacher name somewhere
# too!
#
# Your code goes below here.
def most_classes(dicts):
  winner = ""
  max_count = 0
  for i in dicts:
    if winner == "":
      max_count = len(dicts[i])
      winner = i
    elif len(dicts[i]) > max_count:
      max_count = len(dicts[i])
      winner = i
  return winner

def num_teachers(dicts):
  total = 0
  for i in dicts:
    total += 1
  return total

def stats(dicts):
  for i in dicts:
    dicts[i] = len(dicts[i])
  return dicts

Answer 1 · 2015-08-21T19:02:10Z

August 21, 2015 7:02pm

Try this code.

def stats(adict):
  statlist = []
  for key, value in adict.items():
    sub_list = [key, int(len(value))]
    statlist.append(sub_list)
  return statlist

My only hypothesis for you getting that error was that somehow in the course of the challenge you somehow managed to modify the values of the dictionary. I just got that error in my python interpreter after using a for loop to change each key's value to an integer, than trying to run the stat function again. I can't yet find a reason why your solution shouldn't work unless the values of the dictionary were modified. :\ SMH

Scratch all that, i figured it out! Your version of the stats function changes the values assigned to the keys of the dictionary to integers, wiping out the original dictionary, that is why it's giving you an error.

Trying to run your stats function twice in a row results in an error on the second time because all the values assigned to the keys of the dictionary have been change to integers. Use a function that preserves the natural order of the dictionary while giving the length of the number of classes.

Answer 2 · 2015-08-23T08:16:48Z

August 23, 2015 8:16am

Hi There - thanks for the response, definitely helped.

I think the simple answer is that the question is asking for a "list of lists" and I was returning a dictionary. Yours returns a list, so works.

Thanks for you help again - I need to read the question better!

Welcome to the Treehouse Community

Looking to learn something new?

Owen Grace

Owen Grace

Values in dictionary are ints?

2 Answers

Brandon Wall

Brandon Wall

Owen Grace

Owen Grace