CODEWITHSUNDEEP
pythonlist-comprehensionreadlinesstartswith
Yafim Simanovsky
Yafim Simanovsky

Reputation: 636

python empty list output for list comprehension from txt

Trying to read a txt file and filter irrelevant lines. Some lines are random strings, some being with '#' hashtag character.

base_txt = open(path, 'rU')
  txt = base_txt.readlines()
  txt = [x for x in base_txt if x.startswith('#')]
  print txt
  print len(txt)

The output is an empty list. If I print txt before the list comprehension then it prints out all the strings in the file.

Is there a syntax error I'm doing?

Upvotes: 0

Views: 78

Answers (1)

ViG
ViG

Reputation: 1868

Your code is ok, you're just looping over the wrong variable. It should be

txt = [x for x in txt if x.startswith('#')]

instead of 

txt = [x for x in base_txt if x.startswith('#')]

Upvotes: 1

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