Sometimes to determine whether a number is within a sequence, the in operator is used to determine membership, and if the condition is true, returns True, and when the condition is false, returns a flase. Such an operator is called a Boolean operator and its true value is called a Boolean.
In Python, you can use the in symbol to determine whether the specified element exists in the list, but I find that there is a difference between the tuple and the array, and the following is the detailed experimental results.
|1 2 3 4 5 6 7 8 9 10 11 12 13-14||>>> ' jb51.net ' in [' haotu.net ', ' jb51.net '] true >>> ' jb51.net ' in (' haotu.net ', ' jb51.net ') True >&G T;> ' jb51.net ' in [' jb51.net/codes ', ' haotu.net '] False >>> ' jb51.net ' in (' jb51.net/codes ', ' haotu.net ') False >>> ' jb51.net ' in [' Jb51.net/codes '] false >>> ' jb51.net ' in (' Jb51.net/codes ') True|
The previous 5 tests were consistent with our expectations, only the last one, after the array into tuples, in the tuple only one element, Python is actually the tuple as a string processing, do not know why there is such a way to deal with, but the development of the time to pay attention to, Using an in statement to determine if an element exists in an array, it is best to use an array of , not a tuple
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