I have an idea to improve indenting guidelines for dictionaries for better readability: If a value in a dictionary literal is placed on a new line, it should have (or at least be allowed to have) a n additional hanging indent.

Below is an example:

mydict = {'mykey':
              'a very very very very very long value',
          'secondkey': 'a short value',
          'thirdkey': 'a very very very '
              'long value that continues on the next line',
}


As opposed to this IMHO much less readable version:

mydict = {'mykey':
          'a very very very very very long value',
          'secondkey': 'a short value',
          'thirdkey': 'a very very very '
          'long value that continues on the next line',
}

As you can see it is much harder in the second version to distinguish between keys and values.