Basic Python Tutorial Note 13: Tuples

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A python tuple is similar to a list, except that the elements of a tuple cannot be modified.

Tuples use parentheses, and the list uses square brackets.

Tuple creation is simple, just add elements in parentheses and separate them with commas.

The following example:

Tup1 = (' Physics ', ' Chemistry ', 1997, n= (1, 2, 3, 4, 5= "A", "B", "C", "D";

To create an empty tuple:

Tup1 = ();

when you include only one element in a tuple, you need to add a comma after the element :

Tup1 = (50,);

Tuples are similar to strings, and subscript indexes start at 0 and can be intercepted, combined, and so on.

accessing tuples

Tuples can use the subscript index to access the values in the tuple, as in the following example:

Tup1 = (' Physics ', ' Chemistry ', 1997, #= (1, 2, 3, 4, 5, 6, 7"tup1[0]:", tup1[0"Tup2[1:5]: ", Tup2[1:5]

Results:

Tup1[0]:  physicstup2[1:5]:  (2, 3, 4, 5)

modifying tuples

The element values in the tuple are not allowed to be modified, but we can combine the tuples with the following example:

Tup1 = (34.56 = ('abc''xyz'); # The following modifications to tuple element operations are illegal.  #  tup1[0] = +; # Create a new tuple Tup3 = tup1 + tup2; print tup3;

Results:

' ABC ' ' XYZ ')

Delete a tuple

element values in tuples are not allowed to be deleted, but we can use the DEL statement to delete an entire tuple, as in the following example:

Tup = ('physics'chemistry', 1997,); Print Tup; del Tup; Print "  "print tup;

When the above instance tuple is deleted, the output variable will have exception information, the output is as follows:

('physics'chemistry', 1997, *) after deleting tup: Traceback (recent):  "test.py" in <module>    print ' tup ' is not defined

Basic Python Tutorial Note 13: Tuples