len(S) to |S|

[h-g-s]

thanks for the amazing plugin. Would be possible to convert len(S) into the mathematical notation |S| (cardinality) ?

[ehamberg]

Unfortunately it's not possible to use conceal to surround something, as far as I know. (Or maybe it's possible by doing some tricks with contained in the syntax rules? Would love to know!)

In the moresymbols branch, # is used to signal length:

vim-cute-python/after/syntax/python.vim

Lines 43 to 44 in ee3b23d

	" Your background, and taste, may affect whether you like # for cardinality ;)
	syntax keyword pyNiceBuiltin len conceal cchar=#