title: Using nested if statements within a while loop (python)
body: <p>Here's my code:</p>
  <pre><code>#Greeting
  print('\n---Sales Discount Calculator---\n')
  
  #User Input
  packageCount = input('Packages Purchased: ')
  
  #To check whether packageCount is an integer or not
  #loop continues until a positive integer is inputted
  validInput = False
  
  while (validInput == False):
      if (packageCount.isdigit()):
          packageCount = int(packageCount)
      if (packageCount != 0):
          validInput = True
          print(packageCount)
      else:
          print('Invalid Input. Try again...')
          packageCount = input('Packages Purchased: ')
  </code></pre>
  <p>I'm trying to see if the input from the user is a positive integer and also not a zero. I need to check if it's an integer first(the first if-statement) because you can't compare type string to numbers. If it is an integer, then I need to check if it is a zero or not(second if-statement). When the second if-statement is not present, the code checks for both a positive integer and if it's a string or not, but somehow when I include the second if statement and type in a string, it continues without printing the 'Invalid Input'(the else). *This causes issues later on.</p>