java tuple

can directly assign a value to the corresponding index location: 1 >>> classmates[1] = 'Sarah'2 >>> classmates3 ['Michael', 'Sarah', 'Tracy'] The Data Types of the elements in the list can also be different, for example: 1 >>> L = ['Apple', 123, True] The list element can also be another list, for example: 1 >>> s = ['python', 'java', ['asp', 'php'], 'scheme']2 >>> len(s)3 4 Note:sThere are only four elements, of whichs[2]It is also a list, which is

Concept: List is a collection, and is a mutable set, a tuple is a set of tuples, immutable collections. A 1.Python built-in data type is a list: lists. A list is an ordered set of elements that can be added and removed at any time.Main points of knowledge: Initialize set param = [' Jerry ', Tom ', ' Lily ', ' Lucy ']; Query the specified location according to subscript Param[0];　　For example, by listing the names of all the classmates in the class, yo

an element with another element, you can assign a value directly to the corresponding index position:' Sarah '>>> classmates['Michael'Sarah' 'Tracy']The data types of the elements in the list can also be different, such as:>>> L = ['Apple', 123, True]The list element can also be another list, such as:>>> s = ['python''java', ['asp ' ' PHP ' ' Scheme ' ]>>> len (s)4Note that s there are only 4 elements, one of which s[2] is a list, which is easier to

also be another list, for example: >>> s = ['python', 'java', ['asp', 'php'], 'scheme']>>> len(s)4>>> s[2][1]'asp' Tuple Tuple is also an ordered list, which is very similar to list. However, once initialized, tuple cannot be modified. It is a bit like the const type variable of C ++. >>> classmates = ('Michael', 'B

' Append elements to the end of the list: Classmates.append (' Jerry ') Classmates [' Joe ', ' Bob ', ' Tom ', ' Jerry ']To delete the elements at the end of the list, you can use POPs (). Classmates.pop () (there is no argument inside the parentheses, default is to delete the end of the element) ' Jerry ' Classmates [' Joe ', ' Bob ', ' Tom ',] To delete the element at the specified location, use pop (i), where I represents the index position: Classmates.pop (1) ' Bob ' Classmates

also replace it by subscript. >>> L[1] = 'America'>>> print L[3.14, 'America', 19.998] Tuple Tuple can be seen as a "unchanged" List. The access is also indicated by subscript, represented by parentheses: >>> t = (3.14, 'China', 'Jason')>>> print t(3.14, 'China', 'Jason') However, you cannot replace the Value assignment: >>> t[1] = 'America'Traceback (most recent call last): File " ", line 1, in

" list, and access is also indicated by the subscript, with parentheses (): >>> t = (3.14, ' China ', ' Jason ') >>> print t (3.14, ' China ', ' Jason ') However, the substitution cannot be re-assigned: >>> t[1] = ' America ' Traceback (most recent call last): File " ", line 1, in t[1] = ' Ame Rica ' TypeError: ' Tuple ' object does not a support item assignment There are no pop and insert, append methods. Yo

Python's nested collection types are list, tuple, set, Dict. List: Looks like an array, but more powerful than an array, supports indexing, slicing, finding, adding, and so on. Tuple tuples: Functions are similar to lists, but once generated, the lengths and elements are immutable (elements are mutable) and seem to be a more lightweight, secure list. Dictionary dict: Key-value pairs structure hash table, a

Tuples are a data structure built into Python. Tuples consist of different elements, each of which can store different types of data, such as strings, numbers, or even tuples. Tuples are write-protected, that is, tuples cannot be modified after they are created, and tuples typically represent a single row of data, while elements in tuples represent different data items. One, the creation of the tuple A tupl