Python built-in function (--range)

English documents:

range ( stop)

range ( start, stop[, step])

Rather than being a function, is range actually an immutable sequence type, as documented in Ranges and sequence Types -list, tuple, range.

Description

1. The range function is used to generate a Range object, and the range type is a type that represents an integer range.

2. You can directly pass in an end integer to initialize a range type with a default starting value of 0 (inclusive of 0). The ending integer can be greater than 0 or less than or equal to 0, but a Range object that is less than or equal to 0 does not actually contain any elements.

>>> A = range (5)>>>5)>>> Len (a)for in A:print(x) 0#  incoming 0, empty Range object >>> len (b) 0>>> C = Range ( -5)  #  incoming negative number, empty Range object >>> len (c) 0

3. You can pass in a starting integer and an end integer to initialize a range type that contains all integers between the starting integer (inclusive) and the ending integer (not included).

>>> a = range (1,5)>>> arange (1, 5) for in a:print  (x)1234

4. The starting and ending integers are passed in, and you can pass in a step value at the same time to initialize a range type, which contains the starting integer (inclusive), and the integer filtered by the stepping value between the ending Integer (contains).

>>> a = range (1,10,3)>>> arange (1, ten, 3) for in a: Print (x)147

5. Initializes the range type with the starting and ending integers, followed by the left arm right-opening principle, which contains the starting integer, but not the ending integer.

>>> a = range (1,5)>>> arange (1, 5 for in a:print  #  contains 1, does not contain 51234

6. Range receives parameters that must be integers and cannot be other data types such as floating-point numbers.

>>> A = range (3.5) Traceback (most recent): File"<pyshell#33>", Line 1,inch<module>a= Range (3.5) TypeError:'float'object cannot is interpreted as an integer>>> A = range ('3.5') Traceback (most recent): File"<pyshell#34>", Line 1,inch<module>a= Range ('3.5') TypeError:'Str'Object cannot is interpreted as an integer

7. Range is actually an immutable sequence type that can take elements, slices, and so on, but cannot modify values on the elements.

>>> a = range (1,5)#  take element #  Slice range (1, 3)#  Modify element value Traceback (most recent call last):  "<pyshell#38>"  in <module>    a[1] = 2'range'not Support Item Assignment

Python built-in function (--range)