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I need help fixing this, i need to make the operations shorter, but they need to still work. BTW I am using python 3

+3 votes
asked Feb 13 by Christopher Bartholf (270 points)
if operation == "add":
    print(num1, "+", num2,"=", num1 + num2)
elif operation == "subtract":
    print(num1, "-", num2,"=", num1 - num2)
elif operation == "multiply":
    print(num1, "*", num2,"=", num1 * num2)
elif operation == "divide":
    print(num1, "/", num2,"=", num1 / num2)
else:
    print("Not a valid operation.")

2 Answers

0 votes
answered Feb 13 by diawara (140 points)
def calcule(a, b, operator):
    operations = {"add":a+b, "subt":a-b, "mul":a*b, "div":a/b}
    symbole = {"add":'+', "subt":'-', "mul":'*', "div":'/'}
    
    try:
        # if the key doesn't exist, it will will throw keyError
        print(a, symbole[operator], b, " = ", operations[operator])
    except KeyError:
        print("unknown operator")

# I'm a beginer too. So of you see a bad pratice in my code, don't hesitate to tell me.

# another error (like) zeroDivisionError can happen too. So you have to upgrade the code
0 votes
answered Feb 13 by Jeff The Chicken (2,810 points)

I don't think there is a shorter way to write it, though Here are two ways to execute it:

Method 1:

Make a calculate function.

def calculate():#This makes a function that asks for the numbers and what to use on them.
    num1 = int(input("Enter a number: "))
    num2 = int(input("Enter a second number: "))
    operation = input("What do you want to do? ")
    if operation == "add":
        print(num1, "+", num2,"=", num1 + num2)
    elif operation == "subtract":
        print(num1, "-", num2,"=", num1 - num2)
    elif operation == "multiply":
        print(num1, "*", num2,"=", num1 * num2)
    elif operation == "divide":
        print(num1, "/", num2,"=", num1 / num2)
    else:
        print("Not a valid operation.")

calculate()#Now all you have to do is call the function like this whenever you want to use it in the code.

Method 2:

Give the function parameters instead of input variables.

def calculate(num1,num2,operation):#This gives the function parameters to use as it operates.
    if operation == "add":
        print(num1, "+", num2,"=", num1 + num2)
    elif operation == "subtract":
        print(num1, "-", num2,"=", num1 - num2)
    elif operation == "multiply":
        print(num1, "*", num2,"=", num1 * num2)
    elif operation == "divide":
        print(num1, "/", num2,"=", num1 / num2)
    else:
        print("Not a valid operation.")

calculate(3,4,"add")#now Whenever you call the function in the code, you can give it instructions for what to do.
calculate(3,4,"subtract")
calculate(3,4,"multiply")
calculate(3,4,"divide")
calculate(3,4,"jeff")
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