- It is very important to be able to check the type of data entered
- If you try to convert data to a type that won’t ‘fit’, your program will crash
- The code below will crash if a non-numeric input is supplied
#This will crash if you enter a string
x = input("Enter a number: ")
x = int(x)- The example below uses the Try/Except statement to catch the error
- The program attempts to execute the code in the try section
- If an error occurs, the code in the Except section is executed
- This works equally well at checking float() conversions too
#This will catch the error, print a message, and set x = 0
x = input("Enter a number: ")
try:
x = int(x)
except:
x = 0
print("You didn't enter a number")Tasks
- Type in the code above and ensure it works
- Modify the program to output “You entered a number” if the input is valid
- Save and label your code
Extension Task
You can use this technique to detect an attempt to divide by zero. Use this code to create a small program that will ask for two numbers and detect any attempt to divide by zero