CODEWITHSUNDEEP
pythonpython-3.x
qasim
qasim

Reputation: 437

how to skip lines starting with # in two files

My input files (1.txt and 2.txt) include the comment lines with a hash #. I want to ignore those lines while reading the input files but my codes ignores those lines only in 1.txt. How can I ignore those comment lines in both/multiple input files 1.txt and 2.txt?

1.txt:

#data 1 3 4 2
#normal data
2.5 1.2
5.5 6.5
3.2 6.3

2.txt:

#saved 0.2 11
#data
#from x data
50.20   13.7
165.55  21.0
128.64  23.0

Here is my code:

with open("1.txt") as f1, open("2.txt") as f2, open("output.txt", mode="w") as out:


    for line1, line2 in zip(f1, f2):

        first_data, second_data = line1.split(), line2.split()
        if not line1.startswith('#') or line2.startswith('#'):

Upvotes: 0

Views: 197

Answers (3)

DDS
DDS

Reputation: 2479

Fun with regex:

import re

# [.....] 

x = re.match("^[^ #].*$", line_from_file1) # this expression takes the lines not beginning with # from file1
if x:
    ## line from file 1 does not start with #
    pass

y = re.match("^[^ #].*$", line_from_file2)
if y:
    ## line from file2 does not start with #
    pass

if x and y:
    #neither line from file1 nor line from file2 start with #
    pass

Upvotes: 1

Jona
Jona

Reputation: 1288

You have to filter lines before applying zip(f1, f2).

Example :

with open("1.txt") as f1, open("2.txt") as f2, open("output.txt", mode="w") as out:

    lines1 = [l for l in f1.readlines() if not l.startswith('#')]
    lines2 = [l for l in f2.readlines() if not l.startswith('#')]

    for line1, line2 in zip(lines1, lines2):

         first_data, second_data = line1.split(), line2.split()
         print(first_data, second_data)

Upvotes: 1

rdas
rdas

Reputation: 21275

Try:

if not line1.startswith('#') or not line2.startswith('#'):

To ignore any line in either file that starts with '#'

Upvotes: 1

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