Check if a string is in a file with Python

Question

I'm new to Python and I'm trying to figure out how I can search for a string in a file and use it as a condition in a if clause: If "String" is in the file, Print("Blablabla")

hspandher · Accepted Answer · 2018-12-21T11:19:15.847

47

As you yourself said, just open the file and check if it is in it.

with open('myfile.txt') as myfile:
     if 'String' in myfile.read():
         print('Blahblah')

Isn't Python delightful?

edited Dec 21 '18 at 11:19

answered Sep 23 '15 at 21:01

hspandher

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If I'm not mistaken, we can use "open('myfile.txt', 'r')" in order to only reading the file, and avoiding the ".read()" ahead. – munizig Nov 25 '20 at 00:59
Is it possible to ignore case? – Ferdossi Feb 15 '21 at 14:48
2

@Ferdossi just do 'String'.lower() in myfile.read().lower() – hspandher Feb 15 '21 at 15:19

score 7 · Answer 2 · edited May 23 '17 at 12:01

7

This is the top answer from a very similar question.

if 'blabla' in open('example.txt').read():
    print "true"

edited May 23 '17 at 12:01

Community

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answered Sep 23 '15 at 21:01

camden

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Won't this leave the file stream open? – Carl Thomé Nov 20 '17 at 11:06
1

This method didn't work for me :( – SrgSprinkles Apr 14 '19 at 15:59
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@SrgSprinkles I'm guessing it didn't work because this answer is Python 2 where the first answer is Python 3. You have to call the right binary. print"" and print() are not interchangeable between versions – MGoBlue93 Aug 02 '20 at 04:36

Check if a string is in a file with Python

2 Answers2