How to arrange string array in reverse order in python

How to sort string arrays in reverse order in python? Here are several methods:

1. Array reverse order:

Reverse order of the original elements Arrange

(1) Slice

>>> arr = [1,2,3,4,3,4]
>>> print (arr[::-1])
[4, 3, 4, 3, 2, 1]

(2)reverse()

>>> arr = [1,2,3,4,3,4]
>>> arr.reverse()
>>> print (arr)
[4, 3, 4, 3, 2, 1]

(3)reversed(arr) #Return a traversable object in reverse order

arr = [1,2,3,4,3,4]
reversed_arr = [] 
for i in reversed(arr):
    reversed_arr.append(i)
print (reversed_arr)
[4, 3, 4, 3, 2, 1]

2. String reverse order:

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(1)Use string interception

param = 'hello'
print (param[::-1])   
olleh

(2)Use reversed() to return the reversed iterable object (string implementation)

param = 'hello'
rev_str = ''
for i in reversed(param):    
    rev_str += i
print (rev_str)     
olleh

(3)Use reversed() to return the reversed iterable object Iterative object (array implementation)

param = 'hello'
rev_arr = []
for i in reversed(param):
    rev_arr.append(i)
print (''.join(rev_arr))
olleh

Another:

Reverse order of elements after sorting:

1. sorted(...) generates a new sorted array

sorted(iterable, cmp=None, key=None, reverse=False) --> new sorted list

2. arr.sort(...) directly operates arr, the elements in arr Arrange in positive order

Sort within the element

param = 'hello' #Return the sort within the element

rev_str = ''.join(sorted(param)) # sorted(param) returns the array arranged in reverse order ['e', 'h', 'l', 'l', 'o']
print rev_str ---->'ehllo'

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