功能traceback.print_stack()
打印调用堆栈。如果我们可以看到每个级别的参数值,将有助于调试。但我找不到办法做到这一点。
例如:
def f1(a=2):
f2(a=a+1)
def f2(a=3):
f3()
def f3(a=4):
print(a)
pdb.set_trace()
f1()
我想从 PDB 提示符打印堆栈,以便打印如下:
f3 a = Not specified
f2 a = 3
f1
我不久前写了一个模块来完成类似的事情。
我的笔记说它适用于 Python 2 和 3。
from __future__ import print_function
from itertools import chain
import traceback
import sys
def stackdump(id='', msg='HERE'):
print('ENTERING STACK_DUMP' + (': '+id) if id else '')
raw_tb = traceback.extract_stack()
entries = traceback.format_list(raw_tb)
# Remove the last two entries for the call to extract_stack() and to
# the one before that, this function. Each entry consists of single
# string with consisting of two lines, the script file path then the
# line of source code making the call to this function.
del entries[-2:]
# Split the stack entries on line boundaries.
lines = list(chain.from_iterable(line.splitlines() for line in entries))
if msg: # Append it to last line with name of caller function.
lines[-1] += ' <-- ' + msg
lines.append('LEAVING STACK_DUMP' + (': '+id) if id else '')
print('\n'.join(lines))
print()
sys.modules[__name__] = stackdump # Make a callable module.
if __name__ == '__main__':
import stackdump
def func1():
stackdump('A')
def func2():
func1()
func1()
print()
func2()
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