title: Understanding IndentationErrors in Python 2.7
body: <p>I tend to get a LOT of IndentationErrors when writing python code. Sometimes the error will go away when I delete and rewrite the line. Can someone provide a high level explanation of IndentationErrors in python for noob?</p>
  
  <p>Here is an example of a recent indentationError I received while playing CheckIO that will not go away:</p>
  
  <pre><code>def checkpass(data):
       """Checks password for &gt;=10 char + 1 number + 1 LC letter + 1 UC letter"""
  
       passlist = []
       uclist = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
                 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 
                 'Y', 'Z']
       lclist = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
                 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
                 'y', 'z']
  
       blah blah.. more code
  </code></pre>
  
  <p>Here is the error that I receive when I call the python script:</p>
  
  <pre><code>$ python passcheck.py
  File "passcheck.py", line 5
  uclist = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
                                                                      ^
  IndentationError: unindent does not match any outer indentation level
  </code></pre>