Python debug breakpoint

debug.py

# -*- coding:utf-8 -*-
#
# When executed, this file shows to following behavior:
#
# $ python debug.py
# * Break: debug.py ::: Line 72
# * Continue with Ctrl+D...
# >>> a
# 10
# >>>
# * Break: debug.py ::: Line 80
# * Continue with Ctrl+D...
# >>> b
# 'Hello'
# >>> mylist
# [20, 'Hello', 20]
# >>> mylist.append(a)
# >>>
# * Break: debug.py ::: Line 86
# * Continue with Ctrl+D...
# >>> a
# '1_one'
# >>> mylist
# [20, 'Hello', 20, 20]
# >>>
# Traceback (most recent call last):
#   File "debug.py", line 92, in <module>
#     tuple()[0]
# IndexError: tuple index out of range
# * Break: debug.py ::: Line 94
# * Continue with Ctrl+D...
# >>>


def debug_breakpoint():
    """
    Python debug breakpoint.
    """
    from sys import exc_info
    from code import InteractiveConsole
    from inspect import currentframe
    from traceback import print_exception
    try:
        import readline # noqa
    except ImportError:
        pass

    caller = currentframe().f_back

    env = {}
    env.update(caller.f_globals)
    env.update(caller.f_locals)

    exc = exc_info()
    if all(exc):
        print_exception(*exc)
    del exc

    shell = InteractiveConsole(env)
    shell.interact(
        '* Break: {} ::: Line {}\n'
        '* Continue with Ctrl+D...'.format(
            caller.f_code.co_filename, caller.f_lineno
        )
    )


a = 10
b = 20
c = 'Hello'

debug_breakpoint()

a = 20
b = c
c = a

mylist = [a, b, c]

debug_breakpoint()


def bar():
    a = '1_one'
    b = '2+2'
    debug_breakpoint()

bar()


try:
    tuple()[0]
except:
    debug_breakpoint()