CODEWITHSUNDEEP
pythonoutputcalculator
Ergkuf
Ergkuf

Reputation: 1

Python Calculator Error output

So I made a Calculator using python 2.7.8 and everything works like it should, unless one thing. I want to receive the error message "ERROR: Minimum Input: Number Operator Number!" when i for example try to calculate "2 +". But I can't get it working. Would be amazing if someone could point out what mistake(s) I made. Here is what is not working correctly:

except len(self.input) < 3:
        print "ERROR: Minimum Input: Number Operator Number!"

And here is the whole code:

import sys

class Calculator(object):

    def __init__(self, input):
        self.input = input

    def divide(self, number1, number2):
        return number1 / number2

    def add(self, number1, number2):
        return number1 + number2

    def sub(self, number1, number2):
        return number1 - number2

    def mult(self, number1, number2):
        return number1 * number2

    def modulo(self, number1, number2):
        return number1 % number2

    def exponentiate(self, number1, number2):
        return number1 ** number2

    def print_error(self, error):
        print error
        sys.exit(-1)

    def print_result(self, result):
        print result
        sys.exit(0)

    def process_input(self):
        try:
            result = float(self.input[1])
            current_operator = ""
            for element in self.input[2:]:
                if element in ["/", "+", "-", "*", "%", "**"]:
                    current_operator = element
                else:
                    number2 = float(element)
                    if current_operator == "/":
                        result = self.divide(result, number2)
                    elif current_operator == "+":
                        result = self.add(result, number2)
                    elif current_operator == "-":
                        result = self.sub(result, number2)
                    elif current_operator == "*":
                        result = self.mult(result, number2)
                    elif current_operator == "%":
                        result = self.modulo(result, number2)
                    elif current_operator == "**":
                        result = self.exponentiate(result, number2)
                    else:
                        self.print_error(error)

            self.print_result(result)
        except ZeroDivisionError:
            print "ERROR: Caught division by zero!"
        except ValueError:
            print "ERROR: Input number could not be parsed!"
        except OverflowError:
            print "ERROR: Result too large! Overflow encountered."
        except len(self.input) < 3:
            print "ERROR: Minimum Input: Number Operator Number!"

calc = Calculator(sys.argv)
calc.process_input()

Thanks for any answer!

Upvotes: 0

Views: 2247

Answers (3)

Walter Anderson
Walter Anderson

Reputation: 1

user_info = input("Enter the following info- Name Age Favorite Sport: ") user_info_split = user_info.split() print "Hello, " + user_info_split[0] + "! " + "I also enjoy " + user_info_split[2] + "!"

Upvotes: 0

Texom512
Texom512

Reputation: 4863

try:
    assert len(self.input) >= 3
    # ...Your code...
except AssertionError:
    print "ERROR: Minimum Input: Number Operator Number!"

The problem is "except" must be followed by an exception and "len(self.input) >= 3" is not an exception ! (AssertionError is an exception)

Upvotes: 0

GoBusto
GoBusto

Reputation: 4788

As you have it, the code won't work. Instead, you'll need to either change this part into an if statement or manually raise an exception:

Old version - won't work.

try:
    # ...code...
except len(self.input) < 3:
    print "ERROR: Minimum Input: Number Operator Number!"

New version - Option A.

if len(self.input) < 3:
    print "ERROR: Minimum Input: Number Operator Number!"
else:
    # ...code...

New version - Option B.

try:
    if len(self.input) < 3:
        raise RuntimeError("Not enough arguments.")
    # ...code...
except RuntimeError:
    print "ERROR: Minimum Input: Number Operator Number!"

I've used RuntimeError as an example, you might want to use something more suitable instead.

Upvotes: 1

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