In python, monkey-patching is the dynamic modification of a class or module. Here is an example of monkey-patching python's native  `time` module:

```python
# import an external module
>>> import time

# monkey-patch module internal function
>>> time.time= lambda: 5.0

# invoke patched function
>>> time.time()
5.0
```

In the above example, the user dynamically changes the behavior of the `time` function, making return a constant value of 5 rather than the correct Unix time.
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