how to print from a particular line from text file in python

Question

I am searching far a particular string using this code:

stringToMatch = 'blah'
matchedLine = ''
#get line
with open(r'path of the text file', 'r') as file:
    for line in file:
        if stringToMatch in line:
            matchedLine = line
            break
#and write it to the file
with open(r'path of the text file ', 'w') as file:
    file.write(matchedLine)

This prints only the string once even if it occurs multiple times. I also want to print all the lines after a particular word occurs. How do i do that?

Your break says leave the for loop once it found one case. You may need to remove/modify that. — Ala Tarighati
– Ala Tarighati, Commented May 11, 2020 at 7:25

AKX · Accepted Answer · 2020-05-11 07:24:54Z

2

Set a flag to keep track of when you've seen the line, and write the lines into the output file in the same loop.

string_to_match = "blah"
should_print = False
with open("path of the text file", "r") as in_file, open("path of another text file", "w") as out_file:
    for line in in_file:
        if string_to_match in line:
            # Found a match, start printing from here on out
            should_print = True
        if should_print:
            out_file.write(line)

answered May 11, 2020 at 7:24

AKX

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Comments

ErdoganOnal · Accepted Answer · 2020-05-11 07:25:30Z

1

stringToMatch = 'blah'
matchedLine = ''

# get line
lines = ''
match = False
with open(r'path of the text file', 'r') as file:
    for line in file:
        if match:
            # store lines if matches before
            lines += line + '\n'
        elif stringToMatch in line:
            # If matches, just set a flag
            match = True

# and write it to the file
with open(r'path of the text file ', 'w') as file:
    file.write(lines)

answered May 11, 2020 at 7:25

ErdoganOnal

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Comments

Ankit Badadiya · Accepted Answer · 2020-05-11 07:53:16Z

0

You can modify your code like this:-

stringToMatch = 'blah'
matchedLine = ''
#get line
with open(r'path of the text file', 'r') as file:
    for line in file:
        if stringToMatch in line:
            matchedLine += line + '\n'

#and write it to the file
with open(r'path of the text file ', 'w') as file:
    file.write(matchedLine)

Hope you got it.

answered May 11, 2020 at 7:53

Ankit Badadiya

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