In Python, you can use the dict.keys() method to return a view object that contains the keys of a dictionary.
This error is raised when trying to encode a Unicode string using the ASCII codec, and the string contains a character that is not within the ASCII range (0-127).
In Python, the "r" prefix before a string denotes that it is a raw string literal.
The __future__ module in Python allows you to enable new language features which are not compatible with the current version of Python.
In Python 2, dict.items() returns a list of the dictionary's key-value pairs, whereas dict.iteritems() returns an iterator over the dictionary's key-value pairs.
In Python 2.X, range and xrange are used to generate a sequence of numbers.