title: Why can't I add for loop within a block without occuring indentation error?
body: <pre><code>def PhoneNumber(text):
      if len(text) != 14:
          return False
      for i in range(0, 4):
          if not text[i].isdecimal():
              return False
      if text[4] != '-':
          return False
      for i in range(5, 8):
          if not text[i].isdecimal():
              return False
      if text[8] != '-':
           return False
      for i in range(9, 11):
          if not text[i].isdecimal():
              return False
      if text[11] != '-':
          
   ** for i in range(12, 14):
          if not text[i].isdecimal():
              return False **
      return True
  
      
  </code></pre>