python frame 对象

import sys

def one():
    two()

def two():
    three()

def three():
    for num in range(3):
        frame = sys._getframe(num)
        show_frame(num, frame)

def show_frame(num, frame):
    print frame
    print "  frame     = sys._getframe(%s)" % num
    print "  funname   = %s()" % frame.f_code.co_name
    print "  file/line = %s:%s" % (frame.f_code.e, frame.f_lineno)

one()

Output

<frame object at 0x606c50>
  #返回当前stack frame
  frame     = sys._getframe(0)
  funname   = three()
  file/line = stack.py:12
<frame object at 0x180be10>
  #返回当前stack 的上层stack frame 
  frame     = sys._getframe(1)
  funname   = two()
  file/line = stack.py:7
<frame object at 0x608d30>
  frame     = sys._getframe(2)
  funname   = one()
  file/line = stack.py:4

sys._getframe([depth]) -> frameobject

Return a frame object from the call stack. If optional integer depth is
given, return the frame object that many calls below the top of the stack.
If that is deeper than the call stack, ValueError is raised. The default
for depth is zero, returning the frame at the top of the call stack.

frameobject 属性

f_back -> frameobject

f_builtins -> dict key:python的内置函数名

f_code -> 代码对象

def test():
    pass

print dir(test)

test.func_code #即是code object 

f_globals -> dict 全局对象 可以修改全局对象

f_locals -> dict 同上

f_lineno

通过pdb inspect current frame

import sys, pdb

def test():
    frame = sys._current_frames()
    a = "lmy"
    pdb.set_trace()

def aFunction():
    a = 1
    b = 'hello'
    c = (12, 3.45)
    test()
    d = "This won't show up in the frame"

aFunction()