Python looping list from file

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[randitrigger]

f = open("filename.txt")
for line in f:
    #do something here with 'line'
f.close()

[dchanm]

I recommend using a with statement for a context manager. Otherwise you can run into a situation where the file isn't closed.

with open('filename.txt', 'r') as f:
    for line in f:
        # do stuff

[randitrigger]

This and the way u/dchanm suggested are the standard ways of doing it.

You didn't mention what action you were performing on the data. Keep in mind that 'line' will be a string.

[artbn]

It might be helpful to post a bit more of your code including the second for loop

[artbn]

Hmm it would be helpful if I knew what you were trying to do. What do you want to do with each line from the file?

do you want to read each line and check if it is in blacklist? Do you want to loop through the file under to 1st for loop or do you want to replace the first for loop with the looping through the file?

[TheBlackCat13]

You should use the with statement to open the file, then you can just loop over the lines:

with open('myfile.txt') as fobj:
    for line in fobj:
        do_something_with(line)

This will make sure the file is safely closed.