atomic weight concerns

[matecsaj]

The atomic weights for Cn and Fl are too low. Also, as indicated by the crash, an atomic weight appears to be absent.

from chempy import Substance
from chempy.util.periodic import symbols

for symbol in symbols:
        print(symbol + ' ' + '%.4f' % Substance.from_formula(symbol).mass)

H 1.0080
He 4.0026
Li 6.9400
Be 9.0122
B 10.8100
C 12.0110
N 14.0070
O 15.9990
F 18.9984
Ne 20.1797
Na 22.9898
Mg 24.3050
Al 26.9815
Si 28.0850
P 30.9738
S 32.0600
Cl 35.4500
Ar 39.9480
K 39.0983
Ca 40.0780
Sc 44.9559
Ti 47.8670
V 50.9415
Cr 51.9961
Mn 54.9380
Fe 55.8450
Co 58.9332
Ni 58.6934
Cu 63.5460
Zn 65.3800
Ga 69.7230
Ge 72.6300
As 74.9216
Se 78.9710
Br 79.9040
Kr 83.7980
Rb 85.4678
Sr 87.6200
Y 88.9058
Zr 91.2240
Nb 92.9064
Mo 95.9500
Tc 98.0000
Ru 101.0700
Rh 102.9055
Pd 106.4200
Ag 107.8682
Cd 112.4140
In 114.8180
Sn 118.7100
Sb 121.7600
Te 127.6000
I 126.9045
Xe 131.2930
Cs 132.9055
Ba 137.3270
La 138.9055
Ce 140.1160
Pr 140.9077
Nd 144.2420
Pm 145.0000
Sm 150.3600
Eu 151.9640
Gd 157.2500
Tb 158.9254
Dy 162.5000
Ho 164.9303
Er 167.2590
Tm 168.9342
Yb 173.0450
Lu 174.9668
Hf 178.4900
Ta 180.9479
W 183.8400
Re 186.2070
Os 190.2300
Ir 192.2170
Pt 195.0840
Au 196.9666
Hg 200.5920
Tl 204.3800
Pb 207.2000
Bi 208.9804
Po 209.0000
At 210.0000
Rn 222.0000
Fr 223.0000
Ra 226.0000
Ac 227.0000
Th 232.0377
Pa 231.0359
U 238.0289
Np 237.0000
Pu 244.0000
Am 243.0000
Cm 247.0000
Bk 247.0000
Cf 251.0000
Es 252.0000
Fm 257.0000
Md 258.0000
No 259.0000
Lr 266.0000
Rf 267.0000
Db 268.0000
Sg 269.0000
Bh 270.0000
Hs 269.0000
Mt 278.0000
Ds 281.0000
Rg 282.0000
Cn 12.0110
Uut 286.0000
Fl 18.9984
Uup 289.0000
Traceback (most recent call last):
File "/Users/matecsaj/Dropbox (Personal)/Projects/electrochemistry/main.py", line 5, in
sub = Substance.from_formula(symbol)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/chempy/chemistry.py", line 180, in from_formula
composition=formula_to_composition(formula),
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/chempy/util/parsing.py", line 281, in formula_to_composition
comp = _parse_stoich(stoich)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/chempy/util/parsing.py", line 209, in _parse_stoich
in _get_formula_parser().parseString(stoich)}
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pyparsing.py", line 1955, in parseString
raise exc
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pyparsing.py", line 3342, in parseImpl
raise ParseException(instring, loc, self.errmsg, self)
pyparsing.ParseException: Expected {Re:('A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|E[rsu]|F[emr]?|G[ade]|H[efgos]?|I[nr]?|Kr?|L[airu]|M[dgnot]|N[abdeiop]?|Os?|P[abdmortu]?|R[abefghnu]|S[bcegimnr]?|T[abcehilm]|Uu[bhopqst]|U|V|W|Xe|Yb?|Z[nr]') | Group:({{Suppress:("(") : ...} Suppress:(")")})}, found 'L' (at char 0), (line:1, col:1)

Process finished with exit code 1