159 lines
4.8 KiB
Python
159 lines
4.8 KiB
Python
# # 字符串
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# my_str = "tom and jerry"
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# value = my_str[2]
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# value1 = my_str[-12]
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# print(f"字符串中取出下标为2的字符为{value}，取出下标为-12的字符为{value1}")
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# # 字符串常用方法index
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# value2 = my_str.index("tom")
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# print(f"字符串查找tom，其起始下标为{value2}")
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# # 字符串常用方法，replace
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# new_my_str = my_str.replace("jerry", "xi_mi")
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# print(new_my_str)
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# print(my_str)
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# # 字符串常用方法 split
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# my_str_list = my_str.split(" ")
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# print(f"{my_str_list}")
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# # 字符串规整操作 strip
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# my_str1 = " hello world "
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# new_my_str1 = my_str1.strip()
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# print(f"{new_my_str1}")
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# my_str2 = "12hello 12world21"
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# new_my_str2 = my_str2.strip("12")
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# print(f"字符串{my_str2}被strip（12）后结果为{new_my_str2}")
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# # 字符串中某字符串出现的次数，count
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# count = my_str.count("a")
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# print(f"{count}")
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# # 统计字符串长度 len()
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# len1 = len(my_str)
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# print(f"{len1}")
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# 字符串遍历
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# index = 0
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# my_str = "Good morning"
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# while index < len(my_str):
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# element = my_str[index]
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# index += 1
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# print(f"{element}")
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# my_str1 = "Good afternoon"
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# for element in my_str1:
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# print(f"{element}")
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# # 序列切片
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# # 对list切片，从1开始，4结束，步长1
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# my_list = [0, 1, 2, 3, 4, 5, 6]
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# result1 = my_list[1:4] # 步长为1，可省略
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# print(f"{result1}")
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# # 从头开始，到最后结束，步长为2
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# result2 = my_list[::2]
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# print(f"{result2}")
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# # 对str切片，从头开始到最后结束，步长-1
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# my_str = "01234567"
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# result3 = my_str[::-1]
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# print(f"{result3}")
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# # 对元组切片，从头开始，到尾结束，步长-2
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# my_tuple=(0,1,2,3,4,5,6,7)
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# result4=my_tuple[::-2]
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# print(f"{result4}")
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# # 集合
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# my_set = {"tom", "jerry", "python", "element", "tom"}
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# my_set_empty = set()
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# print(f"me_set的内容是：{my_set},类型是{type(my_set)}")
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# print(f"me_set_empty的内容是：{my_set_empty},类型是{type(my_set_empty)}")
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# # 添加元素
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# my_set.add("heima")
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# my_set.add("python")
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# print(f"{my_set}")
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# # 移除元素
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# my_set.remove("jerry")
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# print(f"{my_set}")
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# # 随机取出一个元素
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# element = my_set.pop() # 此操作为随机取出
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# print(f"{my_set}")
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# # 清空集合
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# result= my_set.clear()
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# print(f"{my_set}")
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# # 取出两个集合的差集
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# set1 = {1, 2, 3}
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# set2 = {1, 4, 6}
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# set3 = set1.difference(set2)
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# print(set3)
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# print(set1)
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# # 消除差集
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# set1.difference_update(set2)
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# print(f"消除差集后，集合1的结果是{set1}")
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# print(f"消除差集后，集合2的结果是{set2}") # 只对集合1消除，集合2不变
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# 两集合合并
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# set4=set1.union(set2)
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# print(f"两集和合并结果为{set4}")
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# print(f"合并后集合1为{set1}")
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# print(f"合并后集合2为{set2}")#合并后原集合不变
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# #集合统计
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# num=len(set4)
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# print(num)
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# 集合的遍历
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# 集合不支持下标索引，所以不能用while循环
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# set1 = {1, 2,3,4,5,6}
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# for element in set1:
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# print(f"集合的元素有{element}")
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# # 字典
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# my_dict = {"王力宏": 99, "汤姆": 88, "林俊杰": 77}
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# my_dict2 = dict() # my_dict2={}
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# print(f"my_dict的内容是{my_dict},类型 为{type(my_dict)}")
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# print(f"my_dict2的内容是{my_dict2},类型 为{type(my_dict2)}")
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# # 定义重复字典
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# my_dict1 = {"王力宏": 99, "王力宏": 88}
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# print(f"重复定义的结果{my_dict1}")
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# 从字典基于key获取value
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# result = my_dict["王力宏"]
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# result1 = my_dict["林俊杰"]
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# print(f"王力宏的考试分数为：{result}")
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# print(f"王力宏的考试分数为：{result1}")
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# # 字典嵌套
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# stu_score_dict = {
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# "王力宏":{
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# "语文":77,
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# "数学":88,
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# "英语":66,
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# },
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# "周杰伦":{
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# "语文":99,
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# "数学":99,
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# "英语":99,
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# }
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# }
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# score = stu_score_dict["周杰伦"]["语文"]
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# print(f"周杰伦的语文信息为{score}")
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# # 字典常用操作
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# my_dict = {"周杰伦": 33, "林俊杰": 24, "张学友": 88}
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# my_dict["张信哲"] = 32
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# print(f"更新后my_dict结果是{my_dict}")
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# my_dict["周杰伦"] = 38
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# print(f"更新后my_dict结果是{my_dict}")
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# # 删除元素
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# score = my_dict.pop("周杰伦")
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# print(f"字典中被删除了一个元素，结果为{my_dict},周杰伦的考试分数为{score}")
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# my_dict.clear()
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# print(f"字典被清空了，内容是{my_dict}")
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# 获取全部的key
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my_dict = {"周杰伦": 33, "林俊杰": 24, "张学友": 88}
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keys = my_dict.keys()
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print(f"字典的全部key是{keys}")
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# 遍历字典
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# 方式1通过获取全部的key来完成遍历
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for key in my_dict.keys():
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print(f"字典的key是：{key}")
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print(f"字典的value是：{my_dict[key]}")
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# 方式2 直接对字典进行for循环,每次循环都是直接得到key
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for key in my_dict:
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print(f"字典的key是：{key}")
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print(f"字典的value是：{my_dict[key]}")
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# 统计字典的数量，len（）
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num = len(my_dict)
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print(f"字典中的key数量为{num}")
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