Broken CI on macosx with MNIST example

[vfdev-5]

Another weird failure with Macos

Run # MNIST
  File "examples/mnist/mnist.py", line 67
    pbar = tqdm(initial=0, leave=False, total=len(train_loader), desc=f"ITERATION - loss: {0:.2f}")
                                                                                                 ^
SyntaxError: invalid syntax
Error: Process completed with exit code 1.

[trsvchn]

Yeah, that's weird, looks like Python 2 is used:

  # MNIST
  # 1) mnist.py
  which python
  python --version
  python examples/mnist/mnist.py --epochs=1
  shell: /bin/bash -l {0}
  env:
    pythonLocation: /Users/runner/hostedtoolcache/Python/3.8.12/x64



/usr/local/bin/python
Python 2.7.18
  File "examples/mnist/mnist.py", line 67
    pbar = tqdm(initial=0, leave=False, total=len(train_loader), desc=f"ITERATION - loss: {0:.2f}")
                                                                                                 ^

on ubuntu we have:

Run # MNIST
  # MNIST
  # 1) mnist.py
  which python
  python --version
  python examples/mnist/mnist.py --epochs=1
  shell: /usr/bin/bash -l {0}
  env:
    pythonLocation: /opt/hostedtoolcache/Python/3.8.12/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.8.12/x64/lib


/opt/hostedtoolcache/Python/3.8.12/x64/bin/python
Python 3.8.12

[trsvchn]

This is because of "conda to pip migration", now we are using default python, and for macosx it's python 2.7
https://docs.python.org/3/using/mac.html#getting-and-installing-macpython

[trsvchn]

Let me check possible solution!