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# Stuck in Teacher Stats Q4

Can someone help me to figure out how to do challenge # 4 to list all courses offered by all teachers?

Additionally, I am struggling to figure out a program solution on top of my head with each challenge. I always need to go trial and error and change some lines of code before I finally got the correct solution. Are there ways to improve our brain mentally and be able to figure out a program in our head for different challenges with practice before we start coding?

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(teacherdict):
newdict = {}
for key, value in teacherdict.items():
newdict[ len(value) ] = key
return newdict[ max(newdict.keys()) ]

def num_teachers(teacherdict):
return len(teacherdict)

def stats(teachers):
num_classes = []
for name, value in teachers.items():
new_list = [name, len(value)]
num_classes.append(new_list)
return num_classes

def courses(teachers):
class_list = []
for value in teachers.values():
```

PLUS
```def most_classes(dict):
max_count = 0
str = ""
alist = dict.values()
for key, value in dict.items():
if len(value) > max_count:
max_count = len(value)
str = key
return str

def num_teachers(dict):
return len(dict.keys())

def stats(dict):
slist = []
for key, value in dict.items():
slist.append([key, len(value)])
return slist

def courses(dict):
clist = []
for value in dict.values():
clist.extend(value)
return clist
```

Looks like you're almost there. You already extract the list of classes for each teacher into value.

So now you just need to add the value list to the class_list (concatenate, not append).

Finally return the class_list.

Hi Steven, do I have to create another empty list to hold value inside for loop?