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python goto with system trace function
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import sys | |
def j(lineno): | |
frame = sys._getframe().f_back | |
called_from = frame | |
def hook(frame, event, arg): | |
if event == 'line' and frame == called_from: | |
try: | |
frame.f_lineno = lineno | |
except ValueError as e: | |
print "jump failed:", e | |
while frame: | |
frame.f_trace = None | |
frame = frame.f_back | |
return None | |
return hook | |
while frame: | |
frame.f_trace = hook | |
frame = frame.f_back | |
sys.settrace(hook) | |
def foo(): | |
a = 1 | |
j(30) | |
a = 2 | |
print 1 | |
print 2 | |
if a == 1: | |
j(28) | |
print 4 | |
foo() |
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2 | |
1 | |
2 | |
4 |
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