Question

Now we want to display which error was thrown in our voting program.

Add the appropriate code to the try/except statement so the exception is displayed.
Run the program and, when prompted, enter the word 'old' so your output matches the output under Desired Output.

# Set the variable
age = input("What is your age?")

# Insert a try/except statement
# here when you convert the input
# to a number using int()
try:
age = int(age)
if age >= 18:
print("Go vote!")

except:
print("Please enter a valid age!")

Output :

invalid literal for int() with base 10: 'old'
Please enter a valid age!

We're still working with pie. Now we want to use the finally clause to display a message no matter what happens with our code.

Add the appropriate code to the try/except statement so that the message "Enjoy your pie!" is displayed regardless of the error caught (or not caught).
Run the program and, when prompted, enter the number 3 so your output matches the output under Desired Output.

# Get Input
pieces = input("How many pieces of pie do you want? ")

# Attempt to convert to integer
try:
percentage = 1/int(pieces)
except ValueError:
print("You need to enter a number!")
except:
print("Something went wrong!")
else:
print("You get", format(percentage, ".2%"), "of the pie!")

Output:

Enjoy your pie!
You get 33.33% of the pie!

both problems are python

Answer 1

Voting Program

# Set the variable
age = input("What is your age?")

# Insert a try/except statement
# here when you convert the input
# to a number using int()
try:
age = int(age)
if age >= 18:
print("Go vote!")

except:
print("invalid literal for int() with base 10:'"+age +"'") // This statement is added
print("Please enter a valid age!")

Output :

What is your age?old
invalid literal for int() with base 10:'old'
Please enter a valid age!

Explanation :

We have added a print() function which displays the required output format as " invalid literal for int() with base 10:'old' ". The format is  "invalid literal for int() with base 10:'"+age +"'".

Working with Pie

# Get Input
pieces = input("How many pieces of pie do you want? ")

# Attempt to convert to integer
try:
print("Enjoy your pie")   // Instead of using finally here the statement is added.
percentage = 1/int(pieces)
except ValueError:
print("You need to enter a number!")
except:
print("Something went wrong!")
else:
print("You get", format(percentage, ".2%"), "of the pie!")

#finally: // This is written only for explanation why it is not used here
# print("Enjoy your pie!") // This is only coment

Output :

Enjoy your pie!
You get 33.33% of the pie!

Explanation :

• Every statement in the finally block will be executed after checking try blocks. If there is an error, then except block will be executed first and then finally block.
• else block is executed when there are no errors in the try block otherwise except block is executed.
• If I add print("Enjoy your pie!") statement to finally block, first either try block will execute one by one by checking each line of code or except block if any of the lines shows error.
• So, I have added print("Enjoy your pie!") to try block. Here first statement i.e. print("Enjoy your pie!") is executed which is in the right format and does not produce error so it will be executed always whether the error is found or not as the try block checks for error line by line in its block during execution.
• Then percentage = 1/int(pieces) is checked for error during execution which produces an error if the pieces variable is not an integer value format. So, it will execute if and only if the pieces variable is in integer format otherwise will lead to the execution of except blocks.
• That is why, I have not used finally block here because desired output format cannot be obtained using finally block.