Calculate of MolarMass.py

# -*- coding: utf-8 -*-
"""
Created on Thu Apr 11 18:33:28 2019
版权所有（c）<2019> 氘化氢

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"""
import re
elements = {"H": 1.008, "He": 4.003, "Li": 6.941, "Be": 9.012, "B": 10.81, "C": 12.011, "N": 14.007, "O": 15.999, "F": 18.998, "Ne": 20.179, "Na": 22.990, "Mg": 24.305, "Al": 26.982, "Si": 28.086, "P": 30.974, "S": 32.06, "Cl": 35.453, "Ar": 39.948, "K": 39.098, "Ca": 40.08, "Sc": 44.956, "Ti": 47.88, "V": 50.942, "Cr": 51.996, "Mn": 54.938, "Fe": 55.847, "Co": 58.933, "Ni": 58.693, "Cu": 63.546, "Zn": 65.39, "Ga": 69.72, "Ge": 72.61, "As": 74.922, "Se": 78.96, "Br": 79.904, "Kr": 83.80, "Rb": 85.468, "Sr": 87.62, "Y": 88.906, "Zr": 91.224, "Nb": 92.906, "Mo": 95.94, "Tc": 97.907, "Ru": 101.07, "Rh": 102.906, "Pd": 106.42, "Ag": 107.868, "Cd": 112.411, "In": 114.82, "Sn": 118.710, "Sb": 121.757, "Te": 127.60, "I": 126.905, "Xe": 131.29, "Cs": 132.905, "Ba": 137.327, "La": 138.905, "Ce": 140.12, "Pr": 140.908, "Nd": 144.24, "Pm": 144.913, "Sm": 150.36, "Eu": 151.96, "Gd": 157.25, "Tb": 158.925, "Dy": 162.50, "Ho": 164.930, "Er": 167.26, "Tm": 168.934, "Yb": 173.04, "Lu": 174.967, "Hf": 178.49, "Ta": 180.948, "W": 183.85, "Re": 186.207, "Os": 190.2, "Ir": 192.22, "Pt": 195.08, "Au": 196.967, "Hg": 200.59, "TI": 204.383, "Pb": 207.2, "Bi": 208.980, "Po": 208.982, "At": 209.987, "Rn": 222.018, "Fr": 223.020, "Ra": 226.025, "Ac": 227.028, "Th": 232.038, "Pa": 231.036, "U": 238.029, "Np": 237.048, "Pu": 244.064, "Am": 243.061, "Cm": 247.070, "Bk": 247.070, "Cf": 251.080, "Es": 252.083, "Fm": 257.095, "Md": 258.099, "No": 259.101, "Lr": 262, "Rf": 261, "Db": 262, "Sg": 263, "Bh": 262, "Hs": 265, "Mt": 266}
def cut(compoundstr):
    pattern="[A-Z]"
    cut0=re.sub(pattern,lambda x:" "+x.group(0),compoundstr)
    cut1=cut0.split()
    return cut1
def calc(eles):
    if eles[-1] in "0123456789":
        return elements[eles[:-1]]*int(eles[-1])
    else:
        return elements[eles]
def calu():
    s=0
    compound=input("input the compound to calculate the molarmass:\n")
    print("start cutting")
    elementslist=cut(compound)
    print(elementslist)
    for i in elementslist:
        print(i)
        print(calc(i))
        s+=calc(i)
    return s
if __name__ =="__main__":
    while input("input enter to contiune,other to exit")=="":
        try:
            print("calculate finished.\n",calu())
        except KeyError:
            print("input error!")
            break