The 3 Python12 list (list of commonly used operators, and commonly used built-in function)

First, comparison operators:

　　list1> list2 compare the size of two lists, Python is compared directly from the 0-th element of the list, if equal, proceed to the next comparison

　　The result is a Boolean value

Second, logical operators　　

1 List1 = [123,234]
2 list2 = [123,345]
3 List1 < list2
4 True
5 
6 List1 and list2
7 [123, 345]
8 list2 and List1
9 [123, 234]

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Third, the operator splicing

　　Directly using the "+" connected to two lists, Note: "+" both sides must be a list

Fourth, the repetition operator

　　* A list of elements to repeat

1 list2 = [123,345]
2 list2*3
3 [123, 345, 123, 345, 123, 345]

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Five members of the relational operators

　　in 和 not in

　　Note: The list element in the access list, the list must indicate the specific location of the element, see the following code

1 list2 = ['1232','23','柯珂',['adf',32]]
2 '23' in list2
3 True
4 32 in list2
5 False
6 32 in list2[3]
7 True

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Sixth, the list of built-in method

　　clear()、copy()、count()、index()、reverse()、sort()

　　clear (): Empty list

　　copy (): the difference copy list, pay attention to the list assignment

　　count (parameter): count the number of the parameters appear in the list

　　reverse (): the list of all the elements upside down

　　index (value, start, stop): determines the start value to the end value of the

　　sort (key = None, reverse = True / Flase): When is False, then small to large, the descending order is True

Seven, list comprehensions

　　(A related expression for A in B)

1 list1 = [x**3 for x in range(5)]
2 lsit1
3 [0, 1, 8, 27, 64]

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