CODEWITHSUNDEEP
pythonpython-2.7
Aidan Tulloch
Aidan Tulloch

Reputation: 3

Python 2: How do I search for a string in a text file before returning the entire line from the text file that contains this string?

Use case: The user enters an ID code. A stored file contains information about people, one line per person, including their ID codes. I need to find this user's line in the file and append that to another text file.

with open("file.txt") as file:
for line in file:
    if id_code in line:
        yield line

Now what? How do I go from yielding the line to getting it in another file? Also, if the id code isn't in the file at all, can I ask them to try again?

Upvotes: 0

Views: 43

Answers (1)

wpercy
wpercy

Reputation: 10090

Without the actual txt file, it's hard to say if this will work perfectly, but it's the right general idea.

with open("file.txt", "r") as f, open("otherfile.txt", "a") as g:
    for line in file.readlines():
        lineparts = line.split()
            if id_code in lineparts:
                g.write(line)

Upvotes: 1

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