function for extracting data from lists

[ibreeden]

(Sorry Larz, we were almost at the same time answering.)

Very well, you are making progress. But you should be more precise than saying: " but didn't work as well". You get the following message, right?

Error:
Traceback (most recent call last):
  File "/home/ibreeden/PycharmProjects/Forum/venv/impos01.py", line 23, in <module>
    output = get_data(data, key)
NameError: name 'key' is not defined

It is because you write:

get_data(list_1,'length')
output = get_data(data,key)

Replace that with:

output = get_data(list_1, 'length')

Output:
19.75 

Now this is still not what you want, because this is only the first occurence.
In the function get_data() you have a return in the for-loop. That is wrong. You must return after the loop has finished. So unindent the return statement.

Output:
20.34

Still not what you want, now it shows only the last occurrence. Have a look at the list "y = []". Do you know how to append() values to a list?