On 7/20/16, Danilo J. S. Bellini <danilo.bellini@gmail.com> wrote:
4. Unicode have more than one codepoint for some symbols that look alike, for example "Σ𝚺𝛴𝜮𝝨𝞢" are all valid uppercase sigmas. There's also "∑", but this one is invalid in Python 3. The italic/bold/serif distinction seems enough for a distinction, and when editing a code with an Unicode char like that, most people would probably copy and paste the symbol instead of typing it, leading to a consistent use of the same symbol.
I am not sure what do you like to say, so for sure some info: PEP-3131 (https://www.python.org/dev/peps/pep-3131/): "All identifiers are converted into the normal form NFKC while parsing; comparison of identifiers is based on NFKC."
From this point of view all sigmas are same:
set(unicodedata.normalize('NFKC', i) for i in "Σ𝚺𝛴𝜮𝝨𝞢") == {'Σ'}