114 lines
2.7 KiB
Python
114 lines
2.7 KiB
Python
# # 列表 list()
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# name_list = ['ab', 'bc', 'cd']
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# print(name_list)
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# print(type(name_list))
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#
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# name_list1=[['ba','bc'],'bab']
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# print(name_list1)
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# # 列表下标索引
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# name_list = ['alex', 'tom', 'late']
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# print(name_list[1])
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# print(name_list[-3]) # 反向从-1开始
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#
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# name_list1 = ["alex", ['al', 'ex'], 'tom']
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# print(name_list1[1][0])
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# # 超出循环报错：IndexError: list index out of range
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# # 列表查询
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# my_list = ['alex','tom','jerry']
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# index=my_list.index('alex')
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# print(f"alex在列表中下表索引值为{index}")
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# # 列表修改
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# my_list[2]="cat"
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# print(f"修改后的值为{my_list[2]}")
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# # 指定位置插入数据
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# my_list.insert(1,'mouse')
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# print(my_list)
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# # 追加元素
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# my_list.append("monster")
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# print(my_list)
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# my_list1=['i','love','python']
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# my_list.extend(my_list1)
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# print(my_list)
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#
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# # 元素删除
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# my_list = ['alex', 'tom', 'jerry']
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# del my_list[1]
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# print(my_list)
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#
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# my_list = ['alex', 'tom', 'jerry']
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# element = my_list.pop(1)
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# print(f"通过pop方法取出元素后列表内容{my_list},取出内容为{element}")
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# # 删除元素第一个匹配项
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# my_list = ['alex', 'tom','alex' ,'jerry']
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# my_list.remove('alex')
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# print(my_list)
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# # 清空列表
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# my_list = ['alex', 'tom', 'alex', 'jerry']
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# my_list.clear()
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# print(my_list)
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# # 统计列表中指定元素数量
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# my_list = ['alex', 'tom','alex' ,'jerry']
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# num=my_list.count("alex")
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# print(f'列表中alex元素共有{num}个')
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# # 统计列表中所有元素个数
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# count=len(my_list)
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# print(f'列表中所有元素个数为{count}个')
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# # 列表遍历
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# def list_while_func():
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# my_list = ["alex", "tom", "jerry"]
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# index = 0
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# while index < len(my_list):
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# element = my_list[index]
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# print(f"列表元素为{element}")
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# index += 1
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#
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#
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# list_while_func()
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#
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#
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# def list_for_func():
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# my_list = ["alex", "tom", "jerry"]
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# for element in my_list:
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# print(f"列表的元素有：{element}")
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#
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#
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# list_for_func()
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# # 元组
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# # 定义元组
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# t1 = (1, "hello", True)
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# t2 = ()
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# t3 = tuple()
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# print(f"{t1}\n{t2}\n{t3}\ntype(t1)类型{type(t1)}")
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# # 定义单个元组
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# t4 = ("hello",) # 单个元组加“，”
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# print(f'{t4} {type(t4)}')
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# # 嵌套元组
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# t5 = ((1, 2, 3), (4, 5, 6))
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# print(f"{type(t5)},{t5}")
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# # 取出内容
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# num = t5[0][2]
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# print(num)
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# # 元组操作 : index 查找
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# t6 = ("alex", "tom", "jerry")
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# index = t6.index("tom")
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# print(index)
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# num = t6.count("tom") # 统计单一元素数量
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# print(num)
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# num2 = len(t6) # 统计元组元素数量
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# print(num2)
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# # 元组遍历
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# index = 0
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# while index < len(t6):
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# element = t6[index]
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# print(f"{element}")
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# index += 1
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# for element in t6:
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# print(f"{element}")
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