Python; Error Checking

try; except:

The try: and except: statement allows the programmer to catch an error with out causing the program to crash.

The programmer can then modify the logic in code to deal with the error so the program can either continue or close without crashing.

Sample code:

This try/except is used with a while loop to guaranteed that an integer is entered by the user.

Two other examples are also below.

def getInt():
    isNotAnInt = True
    while isNotAnInt:
        try:
            myInt = int(input("Enter an integer:"))
            isNotAnInt = False
        except:
            print ("Please Enter an Integer")
    return myInt

isnotvalid = True
while isnotvalid:
    try:
        i = int(input("Enter an Integer:  "))
        isnotvalid = False
    except:
        pass
print (i)
isnotvalid = True
while isnotvalid:
    try:
        i = int(input("Enter an Integer:  "))
        if i>=0 and i<=10:
            isnotvalid = False
        else:
            print ("Enter a number between 0 and 10")
    except:
        pass

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