How to create the sequence type range of python
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Sequence types (including lists, etc.) can use the operators in and not in to check whether the specified integer exists in the sequence of integers represented by the range object, 3 in range (5) checks whether it contains 3, and returns True
You can call the built-in function range (the constructor of class range) to create objects of type range
Range (stop)
Range (start, stop)
Range (start, stop, step)
The default value of the starting value of the integer sequence is 0, which can be specified using the parameter start
Use the parameter stop to specify the end value of the sequence; the rang object created does not contain stop
The default step size of an integer sequence is 1, which can be specified using the parameter step
The return value of the built-in function range is an iterator object, which can be converted into a list in order to clearly represent the sequence of integers represented by the returned iterator object
The advantage of the range type is that no matter how long the sequence of integers represented by range objects, all range objects occupy the same memory space, and only three parameters of start,stop,step need to be stored. It is only when the range object is used that you go back to calculate the relevant elements in the sequence
Range (5) # range (0,5)
List (range (5)) # converts range type objects to lists [0,1,2,3,4]
List (range (0,5,1)) # [0,1,2,3,4]
List (range (1,5)) # [1,2,3,4]
List (range (1d10, 2)) # [1, 3, 5, 7, 9]
List (range (0,-10,-2)) # [0,-2,-4,-6,-8]
Help (range) for more descriptions of range
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