python 3.5: TypeError: a bytes-like object is required, not 'str' when writing to a file
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.
You opened the file in binary mode:
with open(fname, 'rb') as f:
This means that all data read from the file is returned as
bytes objects, not
str. You cannot then use a string in a containment test:
if 'some-pattern' in tmp: continue
You'd have to use a
bytes object to test against
if b'some-pattern' in tmp: continue
or open the file as a textfile instead by replacing the
'rb' mode with