Asked By – imagineerThat
Can someone explain why the result I want, “hi”, is preceded with a letter ‘b’ and followed with a newline?
I am using Python 3.3
>>> import subprocess >>> print(subprocess.Popen("echo hi", shell=True, stdout=subprocess.PIPE).communicate()) b'hi\n'
This extra ‘b’ does not appear if I run it with python 2.7
Now we will see solution for issue: Why does Popen.communicate() return b’hi\n’ instead of ‘hi’?
The echo command by default returns a newline character
Compare with this:
print(subprocess.Popen("echo -n hi", \ shell=True, stdout=subprocess.PIPE).communicate())
As for the b preceding the string it indicates that it is a byte sequence which is equivalent to a normal string in Python 2.6+
This question is answered By – Necrolyte2
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