How to search for a string in text files?

Question

I want to check if a string is in a text file. If it is, do X. If it\'s not, do Y. However, this code always returns True for some reason. Can anyone see what i

Answer 1

found = False
def check():
datafile = file('example.txt')
for line in datafile:
    if "blabla" in line:
        found = True
        break
return found

if check():
    print "found"
else:
    print "not found"