title: String Format Checking in Python
body: <p>While preparing for my AS-Level Computer Science exam I came across a question in the pre-release material: </p>
  
  <p>Prompt the user to input a User ID and check if the format of the ID corresponds with pre-defined formatting rules and output accordingly.</p>
  
  <p>The Format (In order):</p>
  
  <ol>
  <li>One upper case letter</li>
  <li>Two Lower case letters</li>
  <li>Three numeric characters (digits)</li>
  </ol>
  
  <p>Example: "Abc123"</p>
  
  <p>I came up with a solution using my language of choice(Python), however, I was wondering if there is a more elegant or better way to solve this. Especially the third check.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>#Task 2.2
  
  u_id = input("Input User ID: ") #DECLARE u_id : string
  numbers = [str(num) for num in range(10)]
  
  #Checking if final 3 characters of User ID (u_id) are digits
  for i in list(u_id[3::]):
      if i not in numbers:
          digit_check = False #DECLARE digit_check : bool
          break
      else:
          digit_check = True
  
  #User ID format check
  if (u_id[0:1].isupper() == True) and (u_id[1:3] == u_id[1:3].lower()) and (digit_check == True):
      print ("Correct Format")
  else:
      print ("Wrong Format")
  </code></pre>
  
  <p>Ignore the DECLARATION comments. They are an exam requirement.</p>
  
  <p>Thanks</p>