I've very recently migrated to Py 3.5. This code was working properly in Python 2.7:

with open(fname, 'rb') as f: lines = [x.strip() for x in f.readlines()] for line in lines: tmp = line.strip().lower() if 'some-pattern' in tmp: continue # ... code 

After upgrading to 3.5, I'm getting the:

TypeError: a bytes-like object is required, not 'str' 

error on the last line (the pattern search code).

I've tried using the .decode() function on either side of the statement, also tried:

if tmp.find('some-pattern') != -1: continue 

- to no avail.

I was able to resolve almost all 2:3 issues quickly, but this little statement is bugging me.