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   • Basic Calculator in Python

     Top Answer

     Answered Jan 24, 2016 · 1 votes

     Based on the code above, you are never actually running main(). Right now, you have said that the definition of main is to prompt the user, check if the input was correct, and then do the math. The main() at the end causes the program to repeat after doing all this (not sure if you want the loop or not).

     If you don't want the loop, and just want to run the calculator once, just remove the indent of the last main(), because right now the indentation means it is inside of def main(). Just move it to the left to be at the same indentation level as the def main(): and your program should run fine.

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     1/5

   • Basic Tax Calculator in Python 3.7.6

     Top Answer

     Answered Feb 27, 2020 · 0 votes

     This code looks totally fine to me and running it behaved as I would expect:

     $ python test.pyEnter the #: 1012.0-

     Just guessing at a few ways it might not be working:

     • You are typing a number into the terminal after you run it, right? Calling input will pause the program until you type some string and then press enter. Are you doing that?
     • How are you running the code? You should run it from a terminal (1. open the terminal. 2. cd to your python file. 3. type python3 myfile.py.) If you saved this code in a python file and then ran it from your desktop environment (like by double clicking it in Windows) then it actually will work but the terminal window will close as soon as the program finishes so it will look like nothing happens. If you want this to work, just put input("Press Enter to exit...") as the final line of your program so it will wait and not close right away.

     Also -- a few tips:

     • On line 1, you might want to handle the case where the user enters something that isn't a float -- if they type in some letters instead the program will crash with an exception. You can easily do this with a try...except block.
     • On line 2, float(...) is unnecessary because 1.2 is already a float.
     • Actually, though, when working with money it's a good idea to not use floats because of floating point precision errors. Instead, do your calculations as integer numbers of cents and then divide by 100 at the very end.

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     2/5

   • Creating a basic calculator in python

     Top Answer

     Answered Oct 23, 2016 · 2 votes

     your using = instead of ==

     so it should be like this

     if second =="+":-

     and do the same for all

     = is an assignment statement not comparison

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     3/5

   • Calculator in python

     Top Answer

     Answered Feb 27, 2013 · 1 votes

     You partition the input string regardless, never checking if the operator is even there. .partition() returns empty strings if the partition character is not present in the input:

     >>> '1+1'.partition('*') ('1+1', '', '')-

     So you'll call s.partition('*') but never check if there is any such operator present, resulting in unconditional calls to ret(). You'll always call ret(parts[0]) * ret(parts[2]) regardless of wether * is present in s or not.

     The solution is to either test for the operator first or to check the return value of .partition(). The latter is probably easiest:

     for c in ('+','-','*','/'): parts = s.partition(c) if parts[1] == '*': return ret(parts[0]) * ret(parts[2]) elif parts[1] == '/': return ret(parts[0]) / ret(parts[2]) elif parts[1] == '+': return ret(parts[0]) + ret(parts[2]) elif parts[1] == '-': return ret(parts[0]) - ret(parts[2])

     Note that I reversed the operator order; yes, multiplication and division need to be applied before addition and subtraction, but you are working in reverse here; splitting up the expression into smaller parts, and the operations are then applied when the sub-expression has been processed.

     You could use assignment unpacking to assign the 3 return values of .partition() to easier names:

     for c in ('+','-','*','/'): left, operator, right = s.partition(c) if operator == '*': return ret(left) * ret(right) elif operator == '/': return ret(left) / ret(right) elif operator == '+': return ret(left) + ret(right) elif operator == '-': return ret(left) - ret(right)

     Next you can simplify all this by using the operator

     module, which has functions that perform the same operations as your arithmetic operations. A map should do:

     import operatorops = {'*': operator.mul, '/': operator.div, '+': operator.add, '-': operator.sub}-for c in ('+','-','*','/'): left, operator, right = s.partition(c) if operator in ops: return ops[operator](ret(left), ret(right))

     Other Answers

     Answered Feb 27, 2013 · 1 votes

     The main thing you are doing wrong is that you are checking the value of c rather that the partitioned operator. You can also unpack the result from s.partition to make things a little easier by using left and right for the actual operations.

     def ret(s): s = str(s) if s.isdigit(): return float(s) for c in ('-','+','*','/'): left, op, right = s.partition(c) if op == '*': return ret(left) * ret(right) elif op == '/': return ret(left) / ret(right) elif op == '+': return ret(left) + ret(right) elif op == '-': return ret(left) - ret(right)print(ret('1+2'))

     Also, you will need to reverse the order of your operations as you want to first do addition and subtraction, followed by multiplication and division.

     What I mean is, if you have an expression like 4+4*3, you want to divide it into

     ret(4) + ret(4 * 3)-

     Since it is a recursive call, you want the operators with the highest precedence to be the last on the call stack so they are executed first when the function returns.

     As an example:

     print(ret('1+2*6'))print(ret('3*8+6/2'))-

     OUTPUT

     13.027.0-

     Other Answers

     Answered Feb 27, 2013 · 0 votes

     In your code you have no condition on the result of s.partition(c), so even if the partition results in ('anything', '', '') you will do a recursion on the first if.

     Edited

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     4/5

   • Basic Python calculator

     Top Answer

     Answered Nov 28, 2021 · 3 votes

     You call main from inside itself. Set this outside the function like this:

     def add(num1, num2): return num1 + num2-def subtract(num1, num2): return num1 - num2def div(num1, num2): return num1/num2def multi(num1,num2): return num1*num2def main(): operation = input("What do you want to do?(+, -, *, or /):") if (operation != "+" and operation != "-" and operation != "*" and operation != "/"): print("Your input is invalid. Please enter a valid input.") else: num1 = float(input("Enter value for num1: ")) num2 = float(input("Enter value for num2: ")) if (operation == "+"): print(add(num1, num2)) elif (operation == "-"): print(subtract(num1, num2)) elif (operation == "*"): print(multi(num1,num2)) elif (operation == "/"): print(div(num1,num2))main() # Added main outside the function

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2. www.programiz.com › python-programming › examplesPython Program to Make a Simple Calculator

   www.programiz.com › python-programming › examples

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   print("2.Subtract") print("3.Multiply") print("4.Divide") while True: # take input from the user. choice = input("Enter choice(1/2/3/4): ") # check if choice is one of the four options if choice in ('1', '2', '3', '4'): try: num1 = float(input("Enter first number: "))

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3. www.geeksforgeeks.org › make-simple-calculatorPython Program to Make a Simple Calculator - GeeksforGeeks

   www.geeksforgeeks.org › make-simple-calculator

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   Sep 23, 2023 · Python Program to Make a Simple Calculator. Create a simple calculator which can perform basic arithmetic operations like addition, subtraction, multiplication, or division depending upon the user input. Approach : User chooses the desired operation. Options 1, 2, 3, and 4 are valid.

4. People also ask

   What is a calculator in Python?

   • The program calls the " calculator " function at the end, which starts the program. Learn how to build a simple calculator in Python using basic mathematical calculations on user input. This step-by-step tutorial will walk you through the process of building a functional calculator that can add, subtract, multiply, and divide numbers.

   Simple Calculator Program in Python - W3Schools

   www.w3schools.in/python/examples/simple-calculator

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   How to use a calculator?

   • We print a menu of operation that the calculator can perform which are Add, Subtract, Multiply, Divide. Then we prompt the user to enter their choice of operation using input () builtin function. Then prompt the user to enter two numbers. We use an if-elif-else block to check the value of the choice variable and call the appropriate function.

   Python Calculator Program

   pythonexamples.org/python-calculator-program/

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   How to use a python function to divide a number?

   • To understand this example, you should have the knowledge of the following Python programming topics: # This function subtracts two numbers def subtract(x, y): return x - y # This function multiplies two numbers def multiply(x, y): return x * y # This function divides two numbers def divide(x, y): return x / y print("Select operation.")

   Python Program to Make a Simple Calculator

   www.programiz.com/python-programming/examples/calculator

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   How to perform arithmetical operations in Python?

   • As you can see that we have created a simple calculator in Python, which can perform different arithmetical operations like add, subtract, multiply, and divide. The user-defined function is add (), subtract (), multiply () and divide () will evaluate the respective operation and display the output. Example: return x + y return x - y return x * y

   How to make a calculator in Python - Python Guides

   pythonguides.com/make-a-calculator-in-python/

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5. www.w3schools.in › python › examplesSimple Calculator Program in Python - W3Schools

   www.w3schools.in › python › examples

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   Enter '+' to add two numbers. Enter '-' to subtract two numbers. Enter '*' to multiply two numbers. Enter '/' to divide two numbers. Enter 'quit' to end the program. : +. Enter a number: 10. Enter another number: 5 10.0 + 5.0 = 15.0. The above program is a simple calculator written in Python.

6. www.digitalocean.com › community › tutorialsHow To Make a Calculator Program in Python 3 | DigitalOcean

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   • — Prompt Users for Input. Calculators work best when a human provides equations for the computer to solve. You’ll start writing your program at the point where the human enters the numbers that they would like the computer to work with.
   • — Adding Operators. Before the program is complete, you’ll add a total of four mathematical operators: + for addition, - for subtraction, * for multiplication, and / for division.
   • — Adding Conditional Statements. The goal of the calculator.py program is for the user to be able to choose among the different operators. Start by adding some information at the top of the program, along with a choice to make, so that the person knows what to do.
   • — Defining Functions. To handle the ability to perform the program as many times as the user wants, you’ll define some functions. First, put your existing code block into a function.

7. pythonexamples.org › python-calculator-programPython Calculator Program

   pythonexamples.org › python-calculator-program

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   Division. We use Arithmetic Operators to perform these operations. Python Program. def add(x, y): """This function adds two numbers""" return x + y. def subtract(x, y): """This function subtracts two numbers""" return x - y. def multiply(x, y): """This function multiplies two numbers""" return x * y.

8. phoenixnap.com › kb › python-calculatorHow to Make a Calculator With Python {in 5 Steps} - phoenixNAP

   phoenixnap.com › kb › python-calculator

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   Feb 1, 2023 · A simple calculator in Python is an excellent project for beginners and advanced programmers. The process of making a calculator involves some basic programming concepts. This includes taking user input, conditional statements , and functions.

9. pythonguides.com › make-a-calculator-in-pythonHow to make a calculator in Python - Python Guides

   pythonguides.com › make-a-calculator-in-python

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   Dec 12, 2020 · As you can see that we have created a simple calculator in Python, which can perform different arithmetical operations like add, subtract, multiply, and divide. The user-defined function is add (), subtract (), multiply () and divide () will evaluate the respective operation and display the output. Example: def add(x,y): return x + y.