Want to continue running the calculator after the answer - python-3.x

Question

def add(n1, n2):
return n1 + n2
def sub(n1, n2):
return n1 - n2
def mul(n1, n2):
return(n1 * n2)
def div(n1, n2):
return n1 / n2
def pow(n1, n2):
return n1 ** n2
operations = {
"+ = Add": add,
"- = Subtract": sub,
"* = Muliply": mul,
"/ = Division": div,
"** = Power": pow
}
try:
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
for sym in operations:
print(sym)
operator = input("Pick an operator from the line above: ")
if operator == "+":
answer = add(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "-":
answer = sub(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "*":
answer = mul(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "/":
answer = div(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "**":
answer = pow(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
else:
print("Enter a valid operator.")
except ValueError:
print("Enter valid inputs.")
Want to write a statement to continue running the calculator after the answer is shown as output. Example, 2.0 + 2.0 = 4.0
I want the code to ask 'Do you want to continue operations with 4? Type 'y' for yes and 'n' for no.'
And then let's say I enter the multiply operator again, and another number to do the calculation with, it should show, 4.0 * 2.0 = 8.0

Answer 1

Okay, as stated in the comments to your original question, you were super close. All you needed to do is wrap your logic in a loop so you can iterate over the items, which I do in my example below with a while True loop. Then outside of that loop, you needed to track a value that the user creates...for example:
def add(n1, n2):
return n1 + n2
def sub(n1, n2):
return n1 - n2
def mul(n1, n2):
return(n1 * n2)
def div(n1, n2):
return n1 / n2
def pow(n1, n2):
return n1 ** n2
operations = {
"+ = Add": add,
"- = Subtract": sub,
"* = Muliply": mul,
"/ = Division": div,
"** = Power": pow
}
try:
# track this value out of loop so it isn't reset
tracked_value = None
# make a continuous loop...
while True:
# anything here will reiterate unless broken
# tracked_value will always be none unless the user opts to reuse it below...
if tracked_value is None:
num1 = float(input("Enter first number: "))
else:
# now we can turn num1 into the tracked value, the user wishes to reuse it
num1 = tracked_value
print(f'You opted to reuse the tracked value for number 1, which was: "{num1}"')
# always will be asked.
num2 = float(input("Enter second number: "))
# print options
for sym in operations:
print(sym)
operator = input("Pick an operator from the line above: ")
# honestly I would alter your dict to remove the need for
# this huge conditional, but I didn't want to change too much
# ex: method = operations.get(operator, None)... if method not None: answer = method(num1, num2)
if operator == "+":
answer = add(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "-":
answer = sub(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "*":
answer = mul(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "/":
answer = div(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "**":
answer = pow(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
else:
print("Enter a valid operator. Try again...")
# 'continue' so you don't hit the code below, this starts the loop again
continue
# now logic is done, ask if they wish to continue or break
should_continue = input(f"Do you want to continue your calculation with your current answer: '{answer}'? "
"Type 'y' for yes and anything else for no. ")
# logic to continue or not, remember continue starts the iteration over
if should_continue.lower() in ['y', 'yes']:
# assign the tracked value now the user wants it.
tracked_value = answer
continue
else:
print('Thanks for using my calulator. See you next time.')
# break out of the while loop, the user opts to exit.
break
except ValueError as ex:
print(f"Enter valid inputs: {ex}")

Answer 2

def add(n1, n2):
return n1 + n2
def sub(n1, n2):
return n1 - n2
def mul(n1, n2):
return(n1 * n2)
def div(n1, n2):
return n1 / n2
def pow(n1, n2):
return n1 ** n2
operations = {
"+ = Add": add,
"- = Subtract": sub,
"* = Muliply": mul,
"/ = Division": div,
"** = Power": pow
}
def calculator():
try:
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
for sym in operations:
print(sym)
operator = input("Pick an operator from the line above: ")
if operator == "+":
answer = add(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "-":
answer = sub(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "*":
answer = mul(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "/":
answer = div(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
elif operator == "**":
answer = pow(num1, num2)
print(f"{num1} {operator} {num2} = {answer}")
else:
print("Enter a valid operator.")
except ValueError:
print("Enter valid inputs.")
calculator()
should_continue = input("Do you want to continue your calculation with your current answer? Type 'y' for yes and 'n' for no. ")
if should_continue == 'y':
should_continue = True
else:
should_continue = False
print("Thank you for using the calculator.")
while should_continue:
calculator()
break