python - 外部函数的调试包装器

Question

我正在寻找一种方法来同时打印和执行一个函数/方法，就像我可以通过包装一个函数来做的那样。问题是我不能直接装饰函数，因为我调用的函数是 jython 模块的一部分。所以我有一些类似的东西

from jythonModule import fun, obj

fun(a,b,c)
o = obj
o.method(e,f)

我正在寻找运行和打印代码所以它会显示

fun(a,b,c) o.method(e,f)

并执行这些命令。如果无法访问 jython 模块，我怎么能做到这一点？干杯

Answer 1

您可以使用sys.settrace：

# trace.py
import sys


def trace_function(frame, event, arg):
    if event == "call":  # Only report function calls
        code_name = frame.f_code.co_name
        code = frame.f_code
        print "Function call: {0} @ {1}:{2}".format(code.co_name, code.co_filename, code.co_firstlineno)
        print "Locals:", frame.f_locals
        print
    return trace_function  # Continue tracing the new scope



def f0(arg):
    print "In f0: ", arg
    print "Done"

def f1(arg):
    print "In f1: ", arg
    f0(arg)

def f2(arg):
    print "In f2: ", arg
    f1(arg)


sys.settrace(trace_function)


f2("The arg string")

将为您提供以下输出：

$ python trace.py:
Function call: f2 @ trace.py:23
Locals: {'arg': 'The arg string'}

In f2:  The arg string
Function call: f1 @ trace.py:19
Locals: {'arg': 'The arg string'}

In f1:  The arg string
Function call: f0 @ trace.py:15
Locals: {'arg': 'The arg string'}

In f0:  The arg string
Done
Function call: _remove @ /Users/thomas/.virtualenvs/ec2vpn/lib/python2.7/_weakrefset.py:38
Locals: {'item': <weakref at 0x106743158; dead>, 'selfref': <weakref at 0x1067956d8; to 'WeakSet' at 0x1067949d0>}

Function call: _remove @ /Users/thomas/.virtualenvs/ec2vpn/lib/python2.7/_weakrefset.py:38
Locals: {'item': <weakref at 0x1067430a8; dead>, 'selfref': <weakref at 0x106743050; to 'WeakSet' at 0x106744e90>}