show variable
inspect with pexpect = infinite loop
example 1
frame = inspect.currentframe ().f_back
print ('frame2:', inspect.getframeinfo (inspect.currentframe ()))
print ('frame:', frame)
print ('frame2:', inspect.getframeinfo (frame))
filename = inspect.getframeinfo (frame).filename
lineno = inspect.getframeinfo (frame).lineno
example 2
print (inspect.stack())