Python中的字符串切片以旋转字符串
给定一个字符串，我们的任务是将字符串切成两种方式。一个是顺时针方向，另一个是逆时针方向。
1.向左（或逆时针）旋转给定的字符串d个元素（其中d<=n）。
2.右（或顺时针）旋转给定的字符串d个元素（其中d<=n）。
示例
Input: string = "pythonprogram" d = 2 Output: Left Rotation: thonprogrampy Right Rotation: ampythonprogr
算法
Step 1: Enter string. Step 2: Separate string in two parts first & second, for Left rotation Lfirst = str[0 : d] and Lsecond = str[d :]. For Right rotation Rfirst = str[0 : len(str)-d] and Rsecond = str[len(str)-d : ]. Step 3: Now concatenate these two parts second + first accordingly.
范例程式码
def rotate(input,d):
# Slice string in two parts for left and right
Lfirst = input[0 : d]
Lsecond = input[d :]
Rfirst = input[0 : len(input)-d]
Rsecond = input[len(input)-d : ]
print ("Left Rotation : ", (Lsecond + Lfirst) )
print ("Right Rotation : ", (Rsecond + Rfirst) )
# Driver program
if __name__ == "__main__":
str = input("Enter String ::>")
d=2
rotate(str,d)输出结果
Enter String ::> pythonprogram Left Rotation: thonprogrampy Right Rotation: ampythonprogr