I'm using this code to get standard output from an external program:
>>> from subprocess import * >>> command_stdout = Popen(['ls', '-l'], stdout=PIPE).communicate()
The communicate() method returns an array of bytes:
>>> command_stdout b'total 0\n-rw-rw-r-- 1 thomas thomas 0 Mar 3 07:03 file1\n-rw-rw-r-- 1 thomas thomas 0 Mar 3 07:03 file2\n'
However, I'd like to work with the output as a normal Python string. So that I could print it like this:
>>> print(command_stdout) -rw-rw-r-- 1 thomas thomas 0 Mar 3 07:03 file1 -rw-rw-r-- 1 thomas thomas 0 Mar 3 07:03 file2
I thought that's what the binascii.b2a_qp() method is for, but when I tried it, I got the same byte array again:
>>> binascii.b2a_qp(command_stdout) b'total 0\n-rw-rw-r-- 1 thomas thomas 0 Mar 3 07:03 file1\n-rw-rw-r-- 1 thomas thomas 0 Mar 3 07:03 file2\n'
Does anybody know how to convert the bytes value back to string? I mean, using the "batteries" instead of doing it manually. And I'd like it to be ok with Python 3.
You need to decode the bytes object to produce a string:
>>> b"abcde" b'abcde' # utf-8 is used here because it is a very common encoding, but you # need to use the encoding your data is actually in. >>> b"abcde".decode("utf-8") 'abcde'
You need to decode the byte string and turn it in to a character (unicode) string.
On Python 2
encoding = 'utf-8' 'hello'.decode(encoding)
On Python 3
encoding = 'utf-8' b'hello'.decode(encoding)