Step $2$: Create an if$/$elif$/$else function.

What if we have more than two conditional statements to consider? In this case, we can use elif statements in the middle of the if$/$else function. An elif statement is evaluated if the if statement is false and before the else statement. You can have as many elif statements as you would like. However, the first one matched will be executed and none of the remaining elif statements will be checked. Nor will the else statement.

The script in the following example asks the user to input the number of an IPv$4$ ACL and then checks whether that number is a standard IPv$4$ ACL, extended IPv$4$ ACL, or neither standard or extended IPv$4$ ACL. a$.$ Create this script for your files. Open a blank script and save it as if$-$acl.py$.$ Copy the script into the file.

aclNum $=$ int$($input$("$What is the IPv$4$ ACL number? $"))$ if aclNum $>=1$ and aclNum $<=99$:

print$("$This is a standard IPv$4$ ACL."$)$ elif aclNum $>=100$ and aclNum $<=199$:

print$("$This is an extended IPv$4$ ACL."$)$ else:

print$("$This is not a standard or extended IPv$4$ ACL."$)$