[Python-ideas] π = math.pi

[Steven D'Aprano]

On Sun, Jun 04, 2017 at 02:36:50AM +1000, Steven D'Aprano wrote:

> But Python 3.5 does treat it as an identifier!
> 
> py> ℘ = 1  # should be a SyntaxError ?
> py> ℘
> 1
> 
> There's a bug here, somewhere, I'm just not sure where...

That appears to be the only Symbol Math character which is accepted as 
an identifier in Python 3.5:

py> import unicodedata
py> all_unicode = map(chr, range(0x110000))
py> symbols = [c for c in all_unicode if unicodedata.category(c) == 'Sm']
py> len(symbols)
948
py> ns = {}
py> for c in symbols:
...     try:
...             exec(c + " = 1", ns)
...     except SyntaxError:
...             pass
...     else:
...             print(c, unicodedata.name(c))
...
℘ SCRIPT CAPITAL P
py>



-- 
Steve