How to add values of keys in dictionaries from input in python

Question

I'm very new to python and am trying to figure out a way to access dictionaries from an input and then add values of similar keys in the dictionaries, then print the resulting value from adding those similar key values. The bad code I have now is:

p = {  
    "charge" : 1,  
    "energy": 938,  
    "spin": 1/2,  
}  
n = {  
    "charge" : 0,  
    "energy": 940,  
    "spin": 1/2,  
}  
e = {  
    "charge": -1,  
    "energy": 0.511,  
    "spin": 1/2,  
}  
x = input("First particle:")  
y = input("Second particle:")  
tcharge = x.get("charge")+y.get("charge")  
tenergy = x.get("energy")+y.get("energy")  
tspin = x.get("spin")+y.get("spin")  
print(tcharge)  
print(tenergy)  
print(tspin)

Answer 1

Use a dictionary to store the names of the particles and their descriptions. Your inputs are strings so the keys of the dictionary should be strings. The values in the dictionary are the dictionaries you've created:

particle = {}
particle['p'] = {  
    "charge" : 1,  
    "energy": 938,  
    "spin": 1/2,  
}  
particle['n'] = {  
    "charge" : 0,  
    "energy": 940,  
    "spin": 1/2,  
}  
particle['e'] = {  
    "charge": -1,  
    "energy": 0.511,  
    "spin": 1/2,  
}  
x = input("First particle:")  
y = input("Second particle:")  
tcharge = particle[x]['charge'] + particle[y]['charge']
tenergy = particle[x]['energy'] + particle[y]['energy']
tspin = particle[x]['spin'] + particle[y]['spin']
print(tcharge)  
print(tenergy)  
print(tspin)