debug_info.py

import sys

class Debugger(object):
    def __init__(self):
        breakpoints = {}

    def call_trace(self):
        frame = sys._getframe(1)
        print(frame.f_code.co_filename, frame.f_lineno, frame.f_locals)

play.py

import dis

from types import CodeType


from debug_info import Debugger

debugger = Debugger()

def foo():
    a = 1
    b = 2
    c = 3
    d = 4

def trace():
    debugger.call_trace()

instruction_for_line = 4

code = foo.__code__
x = code.co_code[0:instruction_for_line]

code2 = trace.__code__
new_bytes = x + code2.co_code + code.co_code[instruction_for_line:]

new_code = CodeType(
    code.co_argcount,  # integer
    code.co_kwonlyargcount,  # integer
    code.co_nlocals,  # integer
    code.co_stacksize,  # integer
    code.co_flags,  # integer
    new_bytes,  # bytes
    code.co_consts,  # tuple
    code.co_names + code2.co_names,  # tuple
    code.co_varnames,  # tuple
    code.co_filename,  # string
    code.co_name,  # string
    code.co_firstlineno,  # integer
    code.co_lnotab,  # bytes
    code.co_freevars,  # tuple
    code.co_cellvars  # tuple
)


print("New code:")
dis.dis(new_code)

exec(new_code)