* Remove code with side effects from main
When running tests withy pytest, some modules execute code in main scope
and open plot or browser windows.
Moves such code under `if __name__ == "__main__"`.
* fixup! Format Python code with psf/black push
* Factors of a number
* Update factors.py
* Fix mypy issue in basic_maths.py
* Fix mypy error in perceptron.py
* def primes(max: int) -> List[int]:
* Update binomial_heap.py
* Add a space
* Remove a space
* Add a space
* fix: Syntax Error lgtm display in matrix/matrix_operation.py.
* Testing for None should use the 'is' operator.
* fix: Too many arguments for string format.
* fix: supress lgtm alert as false positive.
* style: Unnecessary 'pass' statement.
* Revert "fix: Syntax Error lgtm display in matrix/matrix_operation.py."
This reverts commit 4c629b4ce1.
* Travis CI: Add pytest --doctest-modules neural_network
Fixes#987
```
neural_network/perceptron.py:123: in <module>
sample.insert(i, float(input('value: ')))
../lib/python3.7/site-packages/_pytest/capture.py:693: in read
raise IOError("reading from stdin while output is captured")
E OSError: reading from stdin while output is captured
-------------------------------------------------------------------------------- Captured stdout --------------------------------------------------------------------------------
('\nEpoch:\n', 399)
------------------------
value:
```
* Adding fix from #1056 -- thanks @QuantumNovice
* if __name__ == '__main__':
* pytest --ignore=virtualenv # do not test our dependencies
