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str1 = "string"
print(str1[::-1])
str1_list = list(str1)
str1_list.reverse()
print(''.join(str1_list))
str1_list = []
for i in range(len(str1)-1,-1,-1):
str1_list.append(str1[i])
print(''.join(str1_list))
import collections
cd1 = collections.deque(str1)
cd2 = collections.deque()
for char in cd1:
cd2.extendleft(char)
print(''.join(cd2))
def rec(string):
if len(string) != 1:
rec(string[1:])
print(string[0], end='')
rec(str1)
str_list = list(str1)
len_str = len(str_list)
i = 0
while i < len_str / 2:
str_list[i], str_list[len_str - i - 1] = str_list[len_str - i - 1], str_list[i]
i += 1
print(''.join(str_list))
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