Compatibility with Google Colab

[tsuchm]

I tried watchpoints in Google Colab as follows:

!pip install watchpoints
from watchpoints import watch
x = 0
watch(x)

but it raised the following exception:

Exception                                 Traceback (most recent call last)
[<ipython-input-6-68c97bf397ec>](https://localhost:8080/#) in <cell line: 3>()
      1 from watchpoints import watch
      2 x = 0
----> 3 watch(x)

1 frames
[/usr/local/lib/python3.10/dist-packages/watchpoints/watch.py](https://localhost:8080/#) in __call__(self, *args, **kwargs)
     25         with self.set_lock:
     26             frame = inspect.currentframe().f_back
---> 27             argnodes = getargnodes(frame)
     28             for node, name in argnodes:
     29                 self.watch_list.append(

[/usr/local/lib/python3.10/dist-packages/watchpoints/util.py](https://localhost:8080/#) in getargnodes(frame)
     58     m = re.match(r".*?\((.*)\)", line)
     59     if not m:  # pragma: no cover
---> 60         raise Exception(f"Unable to locate watch line {line}")
     61     args = ["".join(s.strip().split()) for s in m.group(1).split(",")]
     62     try:

Exception: Unable to locate watch line from watchpoints import watch

I think that it will be difficult to make watchpoints compatible to Google Colab and Jupyter Notebook, but I will be happy if watchpoints will be available on them.

[gaogaotiantian]

Yeah watchpoints need to parse the file to determine which variable to trace, so colab probably won't work.