Looking for critique on my code

[zeevo234]

That link is really useful, thanks. I'll spend some time to figure out the more proper ways of formatting things. The lsit thing sounds interesting, I'll take a look at that as well.

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        if(a==0):
            print("\nThe \"A\" coefficient can't be equal to zero.\n")
        if((a==0)&(CanCalc==False)):
            print("and")
        if(CanCalc==False):
            print("\nYou can't enter letters.\n")

Why not...

        if(a==0):
           print("\nThe \"A\" coefficient can't be equal to zero.\n")
           if(CanCalc==False):
               print("and")
               print("\nYou can't enter letters.\n")

I have the if statement with the variable CanCalc separate from the other error detection, so that they can display separately as well as simultaneously.