Tuple Operations

Here is a quick run-through of the operations you can do on tuples:

A. Making tuples:

T = () (the empty tuple, which is the tuple with no elements)

T = (x, ) (the tuple with 1 element). Note the comma.

T = (2, 3, 9, 1, 2) This makes a tuple with 5 elements

T = T1 + T2, where T1 and T2 are tuples. This concatenates T1 and T2 into a new tuple T.

T = T1 * 3, where T1 is a tuple. This makes a new tuple T, which is the concatenation of T1 3 times, as in T1 + T1 + T1.

B. Indexing:

T[0]: the first element in tuple T

T[1]: the second element in tuple T

etc.

C. Changing the contents of the tuple, without changing the list itself:

You can’t do this. There is no append() or delete() function for tuples.

You can’t even say T[0] = 5.

D. Other stuff

len(T): the length, or number of entries, of T

for x in T: iterates a loop over all entries of T

x in T: returns True if T has an entry whose value is x