Why does P4Python not recognize P4CONFIG setting?
# script0.py
def main():
    p4 = p4python.P4.P4()
    p4.connect()
    print os.environ['P4CONFIG']
    print p4.p4config_file
    p4.disconnect()

# script0_test.py
subprocess.check_call(['script0.py'])

.p4config
noconfig

.p4config
/home/nyap/proj/.p4config