How to extract data from a loop outside the loop

Question

I calculate standard deviations in a for loop as such:

times = os.listdir(r'filepathway')
    for file in times:
        if file.endswith('.txt'):
           ...
           ...
           z = df.iloc[1004:1255,:]
           y = np.std(z)
           print(y)

and I get a list of values. But when I print(y) in the next cell (outside of the loop), I don't get all the values. How can I basically extract the data from the loop into the next cell?

you need to store y value from each iteration of the loop in some sort of data structure, e.g. list. Then, after the loop, print this list. Also take a look at glob.glob() - you can specify pattern (path/*.txt) and it will return only txt files - no need to check the extension — buran
– buran, Commented Dec 20, 2018 at 18:44

JoshuaCS · Accepted Answer · 2018-12-20 18:50:27Z

1

The reason of why you can even print(y) is because the variable remains with the last value it had. You need to save all those values in a list:

result = []

times = os.listdir(r'filepathway')
for file in times:
    if file.endswith('.txt'):
       ...
       ...
       z = df.iloc[1004:1255,:]
       y = np.std(z)

       result.append(y)

print(result)

answered Dec 20, 2018 at 18:50

JoshuaCS

2,6341 gold badge15 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

JoshuaCS Over a year ago

@D.Kim, please, if this answer worked for you, mark it as accepted (the green checkmark ✓)

D.Kim Over a year ago

Yes that worked! I was waiting for stack overflow to let me accept your answer :)

Collectives™ on Stack Overflow

How to extract data from a loop outside the loop

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related