This community-built FAQ covers the “FoodWheel: Let the Food Choose For You” exercise from the lesson “Project: Board Slides for FoodWheel”.
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FAQs on the exercise FoodWheel: Let the Food Choose For You
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Why do I need to use “.reset_index()” on question 5 but not on question 4 of the lesson.
2 Likes
Why do we need to apply the dot operator to ‘name’ on q5? When I do restaurants.groupby('cuisine').count().reset_index() I get the same thing but it marks it incorrect
Yes with your Command you will getting the same output but its counting all the columns
cuisine id name neighborhood
0 American 10 10 10
1 Chinese 11 11 11
2 Italian 8 8 8
3 Japanese 4 4 4
4 Korean 3 3 3
5 Pizza 4 4 4
6 Vegetarian 4 4 4
We need to specify
name
as we only want to count that columns value…instead of counting all others also.
will give only names column
cuisine name
0 American 10
1 Chinese 11
2 Italian 8
3 Japanese 4
4 Korean 3
5 Pizza 4
6 Vegetarian 4
the correct syntax for writing this command is
dataframe_name.groupby('col1').col2.any_aggregate_command.reset_index()
reset_index() - return index with order
4 Likes
Since question 4 asks for giving a number, .reset_index() isn’t needed at all. But for question 5, I had the same question. My first answer for question 5 was
cuisine_counts = restaurants.groupby('cuisine').id.count()
and cuisine_counts was assigned the following Series:
cuisine
American 10
Chinese 11
Italian 8
Japanese 4
Korean 3
Pizza 4
Vegetarian 4
Here cuisine is the index (not a column).
On the other hand, the expected answer seems to be, for example:
cuisine_counts = restaurants.groupby('cuisine').id.count().reset_index()
In this case, the following DataFrame will be assigned to cuisine_counts:
cuisine id
0 American 10
1 Chinese 11
2 Italian 8
3 Japanese 4
4 Korean 3
5 Pizza 4
6 Vegetarian 4
cuisine is one of the columns. So probably the required one was a DataFrame with cuisine as one of its columns. I think the question statement was unclear in this point.
cuisine_counts = restaurants.groupby(‘cuisine’).name.count().reset_index()
I am not sure what the label should be formatted as. I tried cuisine_labels = restaurants[‘cuisine’] but I keep receiving an ‘label must be length of x’ error when I try to create the pie chart.
Can someone tell me what I’m doing wrong?
