list.reverse(), reversed()
#!/usr/bin/python3
strn = 'abcdefg'
temp_list = list(strn) # ['a', 'b', 'c', 'd', 'e', 'f', 'g']
temp_list.reverse() # ['g', 'f', 'e', 'd', 'c', 'b', 'a']
reverse_str = ''.join(temp_list) # 'gfedcba'
print(reverse_str)
strn = 'abcdefg'
temp_list = list(strn) # ['a', 'b', 'c', 'd', 'e', 'f', 'g']
temp_list = reversed(strn) # <reversed object at 0x7fdc0cd68310>
temp_list = list(temp_list) # ['g', 'f', 'e', 'd', 'c', 'b', 'a']
reverse_str = ''.join(temp_list) # 'gfedcba'
print(reverse_str)
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