Python tuples and python group operations

Python tuples and python group operations

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Tuples: the python tuples (Tuple) are similar to the List. The difference is that the tuples cannot be modified. The tuples use parentheses and the List uses square brackets.

Tuples:Unchangeable

Create a tuples. The instance is as follows:

1 tup1 = ("hello", "world", "ni hao") 2 tup2 = ("1", "2", "3") 3 tup3 = "", "B", "c" 4 tup4 = () # Empty tuples

Access tuples. The instance is as follows:

1 tup1 = ("hello","world","ni hao")2 tup2 = ("1","2","3")3 print tup1[1]4 print tup2[0:]5 print tup2[1:2]6 print tup2[-1]

Instance output result:

1 'world'2 ('1','2','3')3 ('2',)4 ('3')

Modify tuples:

Tuples can only be connected and combined because they cannot be modified.

1 a=(1,2,3)2 b=(2,3,4)3 a+b

Output result:

1 (1, 2, 3, 2, 3, 4)

Delete tuples:

The entire tuples can only be deleted because they cannot be modified.

1 a=(1,2,3,4)2 print a3 del a4 print a

Output result:

Tuples:

1. Iteration

1 tup = (1, 2, 3) 2 # iteration 3 for a in tup: 4 print a 5 6 # determine whether the element exists 7 a = 3 8 if a in tup: 9 print 'element % d is exist' % (a) 10 else: 11 print 'element % d is not exist' % () 12 13 copy 14 tup1 = tup * 415 16 get length 17 len (tup)

2. built-in functions

 

Method Name	Method Overview	Result
Cmp (1, 2, 3), (2, 3, 4 ))	Returns 0 if the two tuples are consistent, and-1 if the two tuples are inconsistent.	-1
Len (1, 2, 3 ))	Obtain the length of a tuples	3
Max (1, 2, 3 ))	Obtains the maximum element of a tuples.	3
Min (1, 2, 3 ))	Obtain the minimum element of a tuples.	1
Tuple ('000000 ')	Convert string into tuples	(1, 2, 3)