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    <p><a href="http://docs.python.org/2/tutorial/datastructures.html#tuples-and-sequences" rel="noreferrer">Tuples</a> are fixed size in nature whereas <a href="http://docs.python.org/2/tutorial/introduction.html#lists" rel="noreferrer">lists</a> are dynamic.<br> In other words, a <code>tuple</code> is <strong>immutable</strong> whereas a <code>list</code> is <strong>mutable</strong>.</p> <ol> <li>You can't add elements to a tuple. Tuples have no append or extend method.</li> <li>You can't remove elements from a tuple. Tuples have no remove or pop method.</li> <li>You can find elements in a tuple, since this doesn’t change the tuple. </li> <li>You can also use the <code>in</code> operator to check if an element exists in the tuple.</li> </ol> <hr> <ul> <li><p><strong>Tuples are faster than lists.</strong> If you're defining a constant set of values and all you're ever going to do with it is iterate through it, use a tuple instead of a list.</p></li> <li><p>It makes your code safer if you “write-protect” data that does not need to be changed. Using a tuple instead of a list is like having an implied assert statement that this data is constant, and that special thought (and a specific function) is required to override that.</p></li> <li><p>Some tuples can be used as dictionary keys (specifically, tuples that contain immutable values like strings, numbers, and other tuples). Lists can never be used as dictionary keys, because lists are not immutable. </p></li> </ul> <p>Source: <a href="http://getpython3.com/diveintopython3/native-datatypes.html#tuples" rel="noreferrer">Dive into Python 3</a> </p>
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    1. POpython: list vs tuple, when to use each?
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    1. USHonest Abe
    1. USjldupont
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    1. COThe "write-protect" analogy only goes so far: the membership of a tuple cannot be changed *but* mutable elements of a tuple *can* be changed: l = list(); t = (l, l); l.append(1)
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      1. USNed Deily
    2. COWhat makes you think tuples are faster then lists?
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      1. USWinston Ewert
    3. COTuples aren't faster than list. In [220]: t_range = tuple(range(100000)) In [221]: 99999 in t_range Out[221]: True In [222]: l_range = range(100000) In [223]: 99999 in l_range Out[223]: True In [224]: %%timeit .....: 99999 in l_range .....: 100 loops, best of 3: 2.97 ms per loop In [225]: %%timeit .....: 99999 in t_range .....: 100 loops, best of 3: 3.01 ms per loop
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      1. USKracekumar
 

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