Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Matt Rule
1,928 PointsTeacher Stats Question
Have the attached code.
Getting the following TypeError: unhashable type: list
Any thoughts? I assume its a simple fix.
def most_courses(teachers_courses):
lng=0
tc="no teacher"
for teacher in teachers_courses:
if len(teachers_courses[teacher])>lng:
lng=len(teachers_courses[teacher])
tc=teacher
return tc
def courses(teachers_courses):
lst=[]
for value in teachers_courses.values():
lst.extend(value)
return lst
def num_teachers(teachers_courses):
num=0
for key in teachers_courses:
num+=1
return num
def num_courses(teachers_courses):
num=0
for value in teachers_courses.values():
num+=len(value)
return num
def stats(teachers_courses):
lst=[]
for teacher in teachers_courses.items():
lst.append([teacher,len(teachers_courses[teacher])])
return lst
1 Answer
Stuart Wright
41,120 PointsWhen iterating through dictionary items, you should have two different variables for key and value. You can call these whatever you want but k and v is common.
for k, v in teachers_courses.items():
lst.append([k, len(v)])