reverse iteration python

1# 1.
2for i in reversed(range(3)): # output: 	0
3    print(i)				 #			1
4    						 # 			2
5# works with arrays as well , reversed(arr)
6
7# 2.
8# another alternative is
9arr = [1,2,3]
10# note: arr[start : end : step]
11for i in arr[::-1]:			 # output:	0
12  print(i)					 # 			1
13  							 #			2
14
15# 3.
16# last alternative i don't recommened!
17# note: range(start, end, step)
18for i in range(len(arr) - 1, -1 , -1): 	# output: 	0
19  print(i)								# 			1
20  										# 			2
21# read more on range() to understand even better how it works has the same rules as the arrays

1for i in range(10, 0, -1):
2  #reverses backwards from 10

1my_list = [1, 2, 3]
2my_list.reverse()           # my_list is modified
3print(my_list)              # '[3, 2, 1]'
4my_revert = my_list[::-1]   # my_list stays [3, 2, 1]
5print(my_revert)            # '[1, 2, 3]'
6# Item by item reverse with range(<start>, <end>, <step>)
7for i in range(len(my_list), 0, -1):		# my_list is [3, 2, 1]
8    print(my_list[i-1])		# '1' '2' '3'
9for i in reversed(range(len(my_list))):
10    print(my_list[i])       # '1' '2' '3'