Chris Angelico wrote:
> On Fri, May 29, 2020 at 5:25 AM Alex Hall alex.moj...@gmail.com wrote:
> >
> > On Thu, May 28, 2020 at 12:57 PM Paul Sokolovsky pmis...@gmail.com wrote:
> > >
> > And in all fairness, all good ideas already came
> > to somebody else years
> > ago. There's https://www.python.org/dev/peps/pep-0299/
> > , successfully
> > rejected yet back in 2002. (So, feel free to use it in your own
> > environment/Python dialect.)
> > Thanks for the link. Pity it was rejected. I can think of one reason I'd
> > quite
> > like this beyond it being DRY and concise: I often see code written by
> > others like
> > this:
> > def foo(bar):
> > print(bar)
> >
> > if __name__ == '__main__':
> > bar = 3
> > foo(bar)
> >
> > Now bar is both a local and global variable, which leads to both annoying
> > IDE warnings and actual bugs. I think I encountered a bug related to this
> > when someone
> > used eval() (which was the right thing to do in this case) and didn't
> > specify
> > the namespaces correctly, but name shadowing made it seem like their code
> > was
> > correct.
> > Point is, I'd like something that encourages people to put all their
> > __main__ logic and variables into a function, rather than a module level
> > conditional.
> > People can already put all their main logic into a function. If you
> want to unit-test your main function, that's the best way to do it.
> The trouble is, how much goes into main() and how much into if
> __name__ == '__main__'? For example: Does your main function accept a
> list of arguments, or does it look in sys.argv? Neither answer is
> wrong. And that means the best way is to NOT force everyone across all
> of Python to choose the same way - let people write their code their
> way.
> ChrisA
It is not enforcing user it just to provide more choice:
```python
if __name__ == '__main__':
... main logic ...
```
or this way:
```python
def __main__();
sys.argv[0]
... main logic ...
```
`__main__` will be called only once at the end of script if it was called as
script
Also on additional benefit, it will help people that came from other languages:
```rust
fn main() {
...
}
```
or
```c
void main() {
...
}
```
or
```java
class MyClass {
public void main(...) {
...
}
}
```
and in Python it could look like this:
```python
def __main__();
... main logic ...
```
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