python function guts
import sys
import threading
def show_guts(f):
sentinel = object()
gutsdata = threading.local()
gutsdata.captured_locals = None
gutsdata.tracing = False
def trace_locals(frame, event, arg):
if event.startswith('c_'): # C code traces, no new hook
return
if event == 'call': # start tracing only the first call
if gutsdata.tracing:
return None
gutsdata.tracing = True
return trace_locals
if event == 'line': # continue tracing
return trace_locals
# event is either exception or return, capture locals, end tracing
gutsdata.captured_locals = frame.f_locals.copy()
return None
def wrapper(*args, **kw):
# preserve existing tracer, start our trace
old_trace = sys.gettrace()
sys.settrace(trace_locals)
retval = sentinel
try:
retval = f(*args, **kw)
finally:
# reinstate existing tracer, report, clean up
sys.settrace(old_trace)
for key, val in gutsdata.captured_locals.items():
print '{}: {!r}'.format(key, val)
if retval is not sentinel:
print 'Returned: {!r}'.format(retval)
gutsdata.captured_locals = None
gutsdata.tracing = False
return retval
return wrapper
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