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This article shows you how to analyze the python list, which is concise and easy to understand, which will definitely brighten your eyes. I hope you can gain something through the detailed introduction of this article.

1. List

Instead of arrays, python introduces lists (list), which can store any type of data, and the data types in the same list can be different.

List when the sequence structure, you can carry out the basic operations of the sequence structure, such as indexing, fetching substrings, addition, multiplication and so on.

two。 Use format

When you create a new list, put all the elements in the list in square brackets, and the adjacent elements are separated by commas (the data type can also be different ha ~)

Str = [10,2.4, 'lmy'] print (str [0]) print (str [1]) print (str [2])' 'output:102.4lmy'''

You can also update the existing elements of the list, using the function append ()

Str = [10,2.4, 'lmy'] str [1] = 5str.append (' good') print (str) 'output: [10,5,' lmy', 'good']''

Delete the element, using the del () function

Str = [10,2.4, 'lmy'] str [1] = 5str.append (' good') del str [0] print (str)''output: [5,' lmy', 'good']''3. Some very useful functions

Count () is used to count the number of occurrences of an element in the list

Str = ['output,' y','n','a','m', 'is',','m','y'] a = str.count ('m') b = str.count ('y') print (a) print (b)''output: 3 2 years'

Index () lookup, where an element first appears in the list

Str = ['output,' y','n','a','m', 'is',','m','y'] a = str.index ('m') b = str.index ('a') print (a) print (b)''output: 0 3''

The remove () function, which deletes the first match of a value in the list

Str = ['masked,' yearly, 'nasty,' axed, 'masked,' is', 'lumped,' masked,'y'] str.remove ('m`) str.remove ('is') print (str)' output: ['yearly,' nasty, 'ajar,' masked, 'lumped,' masked,'y']''

The sort () function, which sorts the elements in the list

Str = ['fags,' eBay, 'asides,' hacks, 'slots,' kills,'m'] str.sort () print (str) # output: ['asides,' eBay, 'fags,' hacks, 'kills,' masks,'s']

Copy () function, which can be used to copy a list

Str = ['fags,' eBay, 'asides,' hacks, 'slots,' kills,'m'] str.sort () string = str.copy () print (string) # output: ['asides,' eBay, 'fills,' hacks, 'kills,' masks,'s'] 4. Tuple tuple

Similar to lists, but tuples are generally unmodifiable

Tuple = ('lmy',' 2002, '9.15') print (tuple) print (tuple [0]) tuple = ('lmy',' 2002,'9,'15) print (tuple) 'output: (' lmy', '2002,' 9.15) lmy ('lmy',' 2002,'9,))''

Since the elements in the tuple cannot be modified, they can only be re-assigned, and the elements in the tuple cannot be deleted. We can only delete the whole tuple with del ().

5. Common functions of tuples

Len () function

Tuple = ('lmy',' 2002','9','15') a = len (tuple) print (a)''output:4'''

Max () and min () functions

Returns the largest and smallest elements in a tuple

Tuple = (152, 2002, 9, 15) a = max (tuple) b = min (tuple) print (a) print (b)''output:20029'''

The tuple () function, which converts a list to a tuple

List = [152,152,9,15] tuple = tuple (list) print (tuple)''output: (152,2002, 9,15)' 'the above is how to analyze the python list. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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