There is something wrong with pt using python.

[Yggdroot]

import subprocess
aaa = subprocess.check_output('pt -g"" .', shell=True)
bbb = subprocess.Popen('pt -g "" .',shell=True,stdout=subprocess.PIPE).stdout.read()
ccc = subprocess.Popen('pt -g "" .',shell=True,stdin=subprocess.PIPE,stdout=subprocess.PIPE).stdout.read()

print aaa
print bbb
print ccc

The result of aaa and bbb is good as expected, but ccc is empty.
I think there is something wrong with pt about pipe.

On windows 10.