python3: tuple tuple

https://www.runoob.com/python3/python3-tuple.html

Tuples use parentheses, square brackets list.

Tuple create very simple, only need to add elements in parentheses and separated by commas can be.

Python is similar to a list of tuples, except that the elements of the tuple can not be modified. When the object is an element (such as List), then the referenced object may not be modified, but the values which may be modified.

E.g:

tp=(1,2,[c,d])

tp [2] [0] = a c will be changed to a time, which is allowed.

TUP1 = >>> ( ' the Google ' , ' Runoob ' , 1997 , 2000 );
 >>> tup2 = ( . 1 , 2 , . 3 , . 4 , . 5 );
 >>> tup3 = " A " , " B " , " C " , " D " ; # brackets need not be
 >>> type (tup3)
 < class  ' tuple ' >

Empty tuples

tup1 = ();

When tuple contains only one element, the element needs to be added after the comma, or brackets will be used as the operator:

Examples (the Python 3.0 + )
 >>> = TUP1 ( 50 )
 >>> type (TUP1) # without comma, type Integer
 < class  ' int ' >
 
TUP1 = >>> ( 50 ,)
 >>> type (TUP1) # comma, a tuple of type
 < class  ' tuple ' >

access:

 
tup1 = ('Google', 'Runoob', 1997, 2000)
tup2 = ( 1 , 2 , 3 , 4 , 5 , 6 , 7 )
 
print ("tup1[0]: ", tup1[0])
print ("tup2[1:5]: ", tup2[1:5])

View Code

delete

tup = ('Google', 'Runoob', 1997, 2000)
 
print (tup)
tup;
Print ( " after deleting tuples TUP: " )
print (tup)




After the deleting tuples tup: 
Traceback (most recent call last):
  File "test.py", line 8, in <module>
    print (tup)
NameError: name 'tup' is not defined

View Code

Operators tuple

Like the string, a tuple can be used between + and calculates asterisk. This means that they can be combined and after replication operation will generate a new tuple.

Python expression	result	description
as ((1, 2, 3))	3	Calculating the number of elements
(1, 2, 3) + (4, 5, 6)	(1, 2, 3, 4, 5, 6)	connection
('Hi!',) * 4	('Hi!', 'Hi!', 'Hi!', 'Hi!')	copy
3 in (1, 2, 3)	True	Element exists
for x in (1, 2, 3): print (x,)	1 2 3	Iteration

Tuple index, taken

Because a sequence of tuples is, we can access the element at the location of a tuple, some elements may be taken in the index, as follows:

Tuple:

L = ('Google', 'Taobao', 'Runoob')

Python expression	result	description
L[2]	'Runoob'	Read the third element
L[-2]	'Taobao'	Reverse reading; read penultimate element
L[1:]	('Taobao', 'Runoob')	Intercepting elements, all the elements from the second start.

Run the examples are as follows:

>>> L = ('Google', 'Taobao', 'Runoob') >>> L[2] 'Runoob' >>> L[-2] 'Taobao' >>> L[1:] ('Taobao', 'Runoob')

Tuple built-in functions

Python tuple contains the following built-in functions

No.	Method and Description	Examples
1	len (tuple) calculates the number of tuples of elements.	>>> tuple1 = ('Google', 'Runoob', 'Taobao') >>> len(tuple1) 3 >>>
2	max (tuple) Returns the maximum element tuple.	>>> tuple2 = ('5', '4', '8') >>> max(tuple2) '8' >>>
3	min (tuple) returns the minimum value tuple element.	>>> tuple2 = ('5', '4', '8') >>> min(tuple2) '4' >>>
4	tuple (seq) converts a list of tuples.	>>> list1= ['Google', 'Taobao', 'Runoob', 'Baidu'] >>> tuple1=tuple(list1) >>> tuple1 ('Google', 'Taobao', 'Runoob', 'Baidu')