printassign.py

import builtins
import inspect
import sys

_print = builtins.print


def trace_func(frame, event, arg):
    for l in [frame.f_globals, frame.f_locals]:
        if l.get("print") is not None and l["print"] is not _print:
            _print(l["print"])
            l["print"] = None

    return trace_func


def begin():
    frame = inspect.currentframe()
    while frame:
        frame.f_trace = trace_func
        frame = frame.f_back
    sys.settrace(trace_func)


begin()