Question

I have a small script that reads a file. After reading a line i’m trying to figure out that the particular line have a especific text in it. For so i do like this

for line in file:
    line = line.lower()

    if line.find('my string'):
        print ('found my string in the file')

reading the file that line.find aways evaluate to true. When i do like

for line in file:
    line = line.lower()

    if 'one big line'.find('my string'):
        print ('found my string in the file')

It evaluate to false, as it suppose to do. As i’m realy new to python programming just for what i’ve shown i just cant think of what i might look for…

Answer 1

It’s better idiomatic python to write this as:

for line in file:
    line = line.lower()

    if 'my string' in line:
        print ('found my string in the file')

rather than using .find() if you don’t care about the position within the string.