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#python

175 posts126 participants22 posts today
Public *
Greg

#Python dicts are ordered (as of 3.7) by insertion order. But Sets are not. Seems ilke an oversight...?

There are 102 comments on this suggestion to add an OrderedSet but why not just enhance Set to work like dict keys? (A lot of the comments aren't helpful either because they just say 'ah you rube, sets aren't ordered' which is appeal to mathematical definition instead of how people use them irl)

discuss.python.org/t/add-order

Discussions on Python.org · Add `OrderedSet` to stdlibCan we have an OrderedSet class in collections? An OrderedSet is a set that maintains insertion ordering. The current workaround is to use dict but I thought that using a dictionary as a set was too ugly to use in my library so I wrote an OrderedSet wrapper around it. It would be nice to have collections.OrderedSet be a thing though.   Relevant: Issue 22097: Linked list API for ordereddict - Python tracker Does Python have an ordered set? - Stack Overflow
Public *
Paul McGuire

Pyparsing 3.2.2 cleans up a formerly internal-only utility method make_compressed_re(), and makes it part of the public API. Given a list of strings, it generates a regex to match those strings and only those (so no cheating like ".*").

Here are before/after expressions for matching chemical symbols.

A regular expression for matching chemical symbols: Ac|Ag|Al|Am|Ar|As|At|Au|Ba|Be|Bh|Bi|Bk|Br|B|Ca|Cd|Ce|Cf|Cl|Cm|Cn| Co|Cr|Cs|Cu|C|Db|Ds|Dy|Er|Es|Eu|Fe|Fl|Fm|Fr|F|Ga|Gd|Ge|He|Hf|Hg| Ho|Hs|H|In|Ir|I|Kr|K|La|Li|Lr|Lu|Lv|Mc|Md|Mg|Mn|Mo|Mt|Na|Nb|Nd|Ne |Nh|Ni|No|Np|N|Og|Os|O|Pa|Pb|Pd|Pm|Po|Pr|Pt|Pu|P|Ra|Rb|Re|Rf|Rg| Rh|Rn|Ru|Sb|Sc|Se|Sg|Si|Sm|Sn|Sr|S|Ta|Tb|Tc|Te|Th|Ti|Tl|Tm|Ts|U|V| W|Xe|Yb|Y|Zn|Zr An optimized regular expression for matching chemical symbols: A[cglmrstu]|B[aehikr]?|C[adeflmnorsu]?|D[bsy]|E[rsu]|F[elmr]?|G[ade] |H[efgos]?|I[nr]?|Kr?|L[airuv]|M[cdgnot]|N[abdehiop]?|O[gs]?|P[abdmo rtu]?|R[abefghnu]|S[bcegimnr]?|T[abcehilms]|U|V|W|Xe|Yb?|Z[nr]
#python#pyparsing#regex
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