[PoC] Modify an instance method using the built-in class type.

instancemethod.py

#!/usr/bin/env python3

# The focus here is the L#34 and L#35.

class Birthday:
    def __init__(self, day=1, month=2, year=3):
        self._day = day
        self._month = month
        self._year = year

    def show(self):
        return f"Day: {self._day}, Month: {self._month}, Year: {self._year}"

class Person:
    def __init__(self, first='tom', last='angelripper', birthday=None):
        self._first = first
        self._last = last

        if birthday is None:
            birthday = Birthday()
            self._birthday = birthday

    @property
    def name(self):
        return f"{self._first} {self._last}\n" + self._birthday.show()

def _(*args):
    retval = s._birthday._show()
    return retval.replace(',', '/')

s = Person()

print('Before:',s._birthday.show())
s._birthday._show = s._birthday.show
s._birthday.show = type(s._birthday.show)(_, ())

print('After:',s._birthday.show())

Output:

$ python3 instancemethod.py 
Before: Day: 1, Month: 2, Year: 3
After: Day: 1/ Month: 2/ Year: 3

This PoC is helpful to understand what sqlmap does.

https://docs.python.org/3/library/types.html
https://python-course.eu/oop/dynamically-creating-classes-with-type.php
https://www.freecodecamp.org/news/dynamic-class-definition-in-python-3e6f7d20a381/

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