Python repeat

Hello, I am currently working on a final project at the university. The program I made is a chemical food calculator. It's just that the program itself works well, but once it goes back, it ends, so I'd like to add it like, "Please enter number 1 to calculate the other chemical quantity and number 2 to end it." But I didn't define the function, so I'd like to get help. I would appreciate it if you could tell me what to do if I change it to a function or if I can repeat it more without defining the function.

element_mass = {'H': 1.00794, 'He': 4.002602, 'Li': 6.941, 'Be': 9.012182, 'B': 10.811, 'C': 12.0107, 'N': 14.0067, 'O': 15.9994, 'F': 18.9984032, 'Ne': 20.1797, 'Na': 22.98976928,
'Mg': 24.305, 'Al': 26.9815386, 'Si': 28.0855, 'P': 30.973762, 'S': 32.065, 'Cl': 35.453, 'Ar': 39.948, 'K': 39.0983, 'Ca': 40.078, 'Sc': 44.955912, 'Ti': 47.867, 'V': 50.9415, 'Cr': 51.9961, 
'Mn': 54.938045, 'Fe': 55.845, 'Co': 58.933195, 'Ni': 58.6934, 'Cu': 63.546, 'Zn': 65.409, 'Ga': 69.723, 'Ge': 72.64, 'As': 74.9216, 'Se': 78.96, 'Br': 79.904, 'Kr': 83.798, 
'Rb': 85.4678, 'Sr': 87.62, 'Y': 88.90585, 'Zr': 91.224, 'Nb': 92.90638, 'Mo': 95.94, 'Tc': 98.9063, 'Ru': 101.07, 'Rh': 102.9055, 'Pd': 106.42, 'Ag': 107.8682, 'Cd': 112.411,
 'In': 114.818, 'Sn': 118.71, 'Sb': 121.760, 'Te': 127.6, 'I': 126.90447, 'Xe': 131.293, 'Cs': 132.9054519, 'Ba': 137.327, 'La': 138.90547, 'Ce': 140.116, 'Pr': 140.90465, 
'Nd': 144.242, 'Pm': 146.9151, 'Sm': 150.36, 'Eu': 151.964, 'Gd': 157.25, 'Tb': 158.92535, 'Dy': 162.5, 'Ho': 164.93032, 'Er': 167.259, 'Tm': 168.93421, 'Yb': 173.04, 
'Lu': 174.967, 'Hf': 178.49, 'Ta': 180.9479, 'W': 183.84, 'Re': 186.207, 'Os': 190.23, 'Ir': 192.217, 'Pt': 195.084, 'Au': 196.966569, 'Hg': 200.59, 'Tl': 204.3833, 'Pb': 207.2,
 'Bi': 208.9804, 'Po': 208.9824, 'At': 209.9871, 'Rn': 222.0176, 'Fr': 223.0197, 'Ra': 226.0254, 'Ac': 227.0278, 'Th': 232.03806, 'Pa': 231.03588, 'U': 238.02891, 
'Np': 237.0482, 'Pu': 244.0642, 'Am': 243.0614, 'Cm': 247.0703, 'Bk': 247.0703, 'Cf': 251.0796, 'Es': 252.0829, 'Fm': 257.0951, 'Md': 258.0951, 'No': 259.1009, 
'Lr': 262, 'Rf': 267, 'Db': 268, 'Sg': 271, 'Bh': 270, 'Hs': 269, 'Mt': 278, 'Ds': 281, 'Rg': 281, 'Cn': 285, 'Nh': 284, 'Fl': 289, 'Mc': 289, 'Lv': 292, 'Ts': 294, 'Og': 294}

import re
totalmass=0
print('Chemical Food Calculator' Please case-sensitive the formula and write the number right after the alphabet. e.g.)CO2, CH4, CuSO4'
formula=input("Please enter a formula":")

while formula.isalnum() is False:
    print('Please enter a formula consisting of only alphabets and numbers. The formula is case-sensitive.')
    formula=input("Please enter a formula":")
else: 
    x=re.findall('([A-Z][a-z]?)([0-9]*)', formula)
    for element,count in x:
        if count=='':
            count=1

        totalmass+=int(count)*element_mass[element]

print('Chemical food'', ',totalass')

If you enter CO2,

It's a chemical food calculator. Please case-sensitive the formula and write the number right after the alphabet. e.g. CO2, CH4, CuSO4
Please enter the formula:CO2
Chemical quantity is 44.0095.

This is how it's printed.

python

2022-09-22 18:21

1 Answers

I made it as simple as possible.

element_mass = {'H': 1.00794, 'He': 4.002602, 'Li': 6.941, 'Be': 9.012182, 'B': 10.811, 'C': 12.0107, 'N': 14.0067, 'O': 15.9994, 'F': 18.9984032, 'Ne': 20.1797, 'Na': 22.98976928,
'Mg': 24.305, 'Al': 26.9815386, 'Si': 28.0855, 'P': 30.973762, 'S': 32.065, 'Cl': 35.453, 'Ar': 39.948, 'K': 39.0983, 'Ca': 40.078, 'Sc': 44.955912, 'Ti': 47.867, 'V': 50.9415, 'Cr': 51.9961, 
'Mn': 54.938045, 'Fe': 55.845, 'Co': 58.933195, 'Ni': 58.6934, 'Cu': 63.546, 'Zn': 65.409, 'Ga': 69.723, 'Ge': 72.64, 'As': 74.9216, 'Se': 78.96, 'Br': 79.904, 'Kr': 83.798, 
'Rb': 85.4678, 'Sr': 87.62, 'Y': 88.90585, 'Zr': 91.224, 'Nb': 92.90638, 'Mo': 95.94, 'Tc': 98.9063, 'Ru': 101.07, 'Rh': 102.9055, 'Pd': 106.42, 'Ag': 107.8682, 'Cd': 112.411,
 'In': 114.818, 'Sn': 118.71, 'Sb': 121.760, 'Te': 127.6, 'I': 126.90447, 'Xe': 131.293, 'Cs': 132.9054519, 'Ba': 137.327, 'La': 138.90547, 'Ce': 140.116, 'Pr': 140.90465, 
'Nd': 144.242, 'Pm': 146.9151, 'Sm': 150.36, 'Eu': 151.964, 'Gd': 157.25, 'Tb': 158.92535, 'Dy': 162.5, 'Ho': 164.93032, 'Er': 167.259, 'Tm': 168.93421, 'Yb': 173.04, 
'Lu': 174.967, 'Hf': 178.49, 'Ta': 180.9479, 'W': 183.84, 'Re': 186.207, 'Os': 190.23, 'Ir': 192.217, 'Pt': 195.084, 'Au': 196.966569, 'Hg': 200.59, 'Tl': 204.3833, 'Pb': 207.2,
 'Bi': 208.9804, 'Po': 208.9824, 'At': 209.9871, 'Rn': 222.0176, 'Fr': 223.0197, 'Ra': 226.0254, 'Ac': 227.0278, 'Th': 232.03806, 'Pa': 231.03588, 'U': 238.02891, 
'Np': 237.0482, 'Pu': 244.0642, 'Am': 243.0614, 'Cm': 247.0703, 'Bk': 247.0703, 'Cf': 251.0796, 'Es': 252.0829, 'Fm': 257.0951, 'Md': 258.0951, 'No': 259.1009, 
'Lr': 262, 'Rf': 267, 'Db': 268, 'Sg': 271, 'Bh': 270, 'Hs': 269, 'Mt': 278, 'Ds': 281, 'Rg': 281, 'Cn': 285, 'Nh': 284, 'Fl': 289, 'Mc': 289, 'Lv': 292, 'Ts': 294, 'Og': 294}

import re
def calculate():
    totalmass=0
    formula=input ("Please enter a formula (exit:2):")

    if formula == '2': return "Quit"
    elif formula.isalnum() is False:
        print('Please enter a formula consisting of only alphabets and numbers. The formula is case-sensitive.')
        return "Retry"
    else: 
        x=re.findall('([A-Z][a-z]?)([0-9]*)', formula)
        for element,count in x:
            if count=='':
                count=1

            totalmass+=int(count)*element_mass[element]

    print('Chemical food'', ',totalass')
    return "Continue"

while True:
    print('Chemical Food Calculator' Please case-sensitive the formula and write the number right after the alphabet. e.g.)CO2, CH4, CuSO4'
    result = calculate()
    if result == 'Quit': break

2022-09-22 18:21

If you have any answers or tips

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