How to run another program by python?

Question

I’m looking to make a calculation engine on Python. For example, I have a name program engine.py, that takes an equation and returns the roots. I wanted to write another program named interface.py, that would just take the equation and send it to the engine to calculate and take the returned value. You can do this?

engine py.

x = str(input())  
x = x.replace("-","+-")  
Eq = list(x.split("+"))  
b = 0  
c = 0  
if "" in Eq: Eq.remove("")  
for i in range(0,len(Eq)):
    if (Eq[i] == "x²"):    
        a = 1  
    elif (Eq[i] == "-x²"):  
        a = -1  
    elif "x²" in Eq[i]:  
        aux = Eq[i]  
        a = int(aux.replace("x²",""))  
    elif (Eq[i] == "x"):  
        b = 1  
    elif (Eq[i] == "-x"):  
        b = -1  
    elif "x" in Eq[i]:
        aux = Eq[i]
        b = int(aux.replace("x",""))
    else:
        c = int(Eq[i])
delta = (b * b) - 4 * a * c 
print("Delta:",delta)
if delta<0:
    print('Essa equacao nao tem raiz real')
elif delta==0:
    x1 = (-b)/(2*a)
    print('Raiz:',x1)
else:
    from math import sqrt
    x1 = (-b+sqrt(delta))/(2*a)
    x2 = (-b-sqrt(delta))/(2*a)
    print('Raizes:')
    print("x':",x1)
    print("x'':",x2)  

Interface.py.

x = input()  
y = manda_para_engine(x)
print(x)

something like that

Answer 1

Yes.

Define your file engine.py more or less as follows:

def calcular_equacao(a, b, c):
    delta = (b * b) - 4 * a * c 
    print("Delta:", delta)
    if delta<0:
        print('Essa equacao nao tem raiz real')
        return None
    elif delta==0:
        x1 = (-b)/(2*a)
        return x1
    else:
        from math import sqrt
        x1 = (-b+sqrt(delta))/(2*a)
        x2 = (-b-sqrt(delta))/(2*a)
        return (x1, x2)  

In the archive interface.py, import engine.py as follows:

import engine

To call the engine function:

a = engine.calcular_equacao(1, 2, 3)

engine.py and interface.py must be in the same directory. Making a print of a, the result must be the tuple with the roots, or an integer, or None if it has no real roots.

Note that I have not directed the treatment logic of the expression to the function. The function is simply called with a, b and c already completed.