Home >Backend Development >Python Tutorial >Determine whether a string is symmetrical, such as: abccba
# 1.判断一字符串是不是对称的,如:abccba def is_symmetrical(str): length = len(str) for index in range(length / 2): if str[index] == str[length - index - 1]: pass else: return False return True if __name__ == "__main__": print is_symmertrical("abcdcba"), print is_symmertrical("abccaa"), 运行结果: True False # 2.用递归的方法判断整数组a[N]是不是升序排列 # index初始化为1 def is_asc(sequence, index): if index > len(sequence) - 1: return True if sequence[index] > sequence[index - 1]: return is_asc(sequence, index + 1) return False if __name__ == "__main__": sequence1 = [1, 100, 100, 200] print is_asc(sequence1, 1), sequence2 = [1, 100, 101, 500] print is_asc(sequence2, 1), 运行结果: False True