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Lance McCormick
7,553 PointsStats Challenge (Step 3) - How can I improve my code?
This step really challenged me, but I powered through it with many tests in the python interpreter and my own code editor. My code passed the challenge but I feel like there might be an easier, more pythonic way of thinking about these things.
At first I ran into string conversion issues when trying to append stuff directly into my teachers list. But I eventually moved away from that and decided on using a sub-list and appending that to the main teachers list instead. This one really made me think hard about how I could create a list of lists.
How can I improve my code?
def stats(teacher_dict):
teacher_list = []
for teacher in teacher_dict:
sub_list = ['', 0]
name = teacher
num_classes = len(teacher_dict[teacher])
sub_list[0] = name
sub_list[1] = num_classes
teacher_list.append(sub_list)
return teacher_list
2 Answers
Chris Freeman
Treehouse Moderator 68,423 PointsYou have all the right elements. The only improvements would be to streamline the statements.
# The for loop block
sub_list = ['', 0]
name = teacher
num_classes = len(teacher_dict[teacher])
sub_list[0] = name
sub_list[1] = num_classes
teacher_list.append(sub_list)
# Can be replaced by
teacher_list.append([teacher, len(teacher_dict[teacher])])
Using the dict.items() method to return both the key and the value, this can be compress further:
def stats(dct):
result = []
for teacher, course_list in dct.items():
result.append([teacher, len(course_list)])
return result
Aby Abraham
Courses Plus Student 12,531 Pointsdef stats(dict):
slist = []
for key, value in dict.items():
slist.append([key, len(value)])
return slist