day4

小咪咪 2021-11-11 05:38 265阅读 0赞

# 作业回顾： #

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# s = '132a4b5c'
    # s1 = s[0]+s[2]+s[1]
    # print(s1)
    #使用while和for循环分别打印字符串s=’asdfer’中每个元素。
    s = 'fkld'
    # for i in s:
    #     print(i)
    # index = 0
    # while 1:
    #     print(s[index])
    #     index += 1
    #     if index == len(s):break
    #如：content = input(‘请输入内容:’)  # 如用户输入：5+9或5+ 9或5 + 9，然后进行分割再进行计算。
    # content=input('>>>').strip()
    # con1=content.split('+')
    #li[]
    # num=0
    # for i in con1:
    #     num+=int(i)
    # print(num)
    # content=input('>>>').strip()
    # index = content.find("+")
    # a = int(content[0:index])
    # b = int(content[index+1:])
    # print(a + b)
    #咱们任意输入一串文字+数字 统计出来数字的个数
    
    s = input("请输入：")  # '1234324324fdsaf1fdsaf12'
    count = 0
    for i in s:
        if i.isdigit():
            count += 1
    print(count)

# list： #

li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
    # l1 = li[0]
    # print(l1)
    # l2 = li[1]
    # print(l2)
    # l3 = li[0:3]
    # print(l3)

## 增： ##

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# append 追加，给列表的最后面追加一个元素
    l = [1, 2, 'a']
    l.append(666)
    print(l) # [1, 2, 'a', 666]
    
    # insert  插入在列表的任意位置插入元素
    l = [1, 2, 'a']
    l.insert(1,'太白')
    print(l) # [1, '太白', 2, 'a']
    
    # extend  迭代着追加，在列表的最后面迭代着追加一组数据
    l = [1, 2, 'a']
    l.extend('太白a')
    print(l)
    
    列表的增

删：

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复制代码
    # pop  通过索引删除列表中对应的元素，该方法有返回值，返回值为删除的元素
    l = ['太白', 'alex', 'WuSir', '女神']
    ret = l.pop(1)
    print(ret,l) # alex ['太白', 'WuSir', '女神']
    
    # remove  通过元素删除列表中该元素
    l = ['太白', 'alex', 'WuSir', '女神']
    l.remove('alex')
    print(l) # ['太白', 'WuSir', '女神']
    
    # clear 清空列表
    l = ['太白', 'alex', 'WuSir', '女神']
    l.clear()
    print(l) # []  
    
    # del
    #按照索引删除该元素
    l = ['太白', 'alex', 'WuSir', '女神']
    del l[2]
    print(l) # ['太白', 'alex', '女神']
    
    # 切片删除该元素
    l = ['太白', 'alex', 'WuSir', '女神']
    del l[1:]
    print(l) # ['太白']
    
    # 切片(步长)删除该元素
    l = ['太白', 'alex', 'WuSir', '女神']
    del l[::2]
    print(l) # ['alex', '女神']
    复制代码

#### 改： ####

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# 按照索引改值
    l = ['太白', 'alex', 'WuSir', '女神']
    l[0] = '男神'
    print(l) # ['男神', 'alex', 'WuSir', '女神']
    
    # 按照切片改值(迭代着增加)
    l = ['太白', 'alex', 'WuSir', '女神']
    l[1:3] = 'abcdefg'
    print(l) # ['太白', 'a', 'b', 'c', 'd', 'e', 'f', 'g', '女神'] 
    
    # 按照切片(步长)改值(必须一一对应)
    l = ['太白', 'alex', 'WuSir', '女神']
    l[::2] = '对应'
    print(l) # ['对', 'alex', '应', '女神']
    
    列表的改

#### 查： ####

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# for i in li:
    #     print(i)
    # print(li[0:2])
    
    #公共方法：
    # l = len(li)
    # print(l)
    # num = li.count('taibai')
    # print(num)
    # print(li.index('wusir'))
    # li = [1,5,4,7,6,2,3]
    # #正向排序
    # # li.sort()
    # # print(li)
    # #反向排序
    # # li.sort(reverse=True)
    # # print(li)
    # #反转
    # li.reverse()
    # print(li)

#### 列表的嵌套：： ####

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li = ['taibai','武藤兰','苑昊',['alex','egon',89],23]
    
    # print(li[1][1])
    # name = li[0].capitalize()
    # # print(name)
    # li[0] = name
    # li[0] = li[0].capitalize()
    # li[2] = '苑日天'
    # print(li[2].replace('昊','ritian'))
    # li[2] = li[2].replace('昊','ritian')
    # li[3][0] = li[3][0].upper()
    # print(li)

# 元祖：： #

元祖 只读列表，可循环查询，可切片。
    儿子不能改，孙子可能可以改。

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# tu = (1,2,3,'alex',[2,3,4,'taibai'],'egon')
    # # print(tu[3])
    # # print(tu[0:4])
    # # for i in tu:
    # #     print(i)
    # tu[4][3]=tu[4][3].upper()
    # print(tu)
    # tu[4].append('sb')
    # print(tu)
    
    # s = 'alex'
    # s1 = 'sb'.join(s)
    # print(s1)
    #列表转化成字符串  list -----> str    join
    # li = ['taibai','alex','wusir','egon','女神',]
    # s = '++++'.join(li)
    #str ----->list   split()
    # print(s)
    
    
    #range  [1,2,3,4,5,6,.......100........]
    
    # for i in range(3,10):
    #     print(i)
    # for i in range(10):
    #     print(i)
    # for i in range(0,10,3):
    #     print(i)
    # for i in range(10,0,-2):
    #     print(i)
    # for i in range(10,-1,-2):
    #     print(i)

li = [1,2,3,5,'alex',[2,3,4,5,'taibai'],'afds']
    # for i in li:
    #     if type(i) == list:
    #         for k in i:
    #             print(k)
    #     else:print(i)
    
    for i in range(len(li)):
        if type(li[i]) == list:
            for j in li[i]:
                print(j)
        else:print(li[i])

转载于:https://www.cnblogs.com/tongge/p/11073065.html

[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211109/776a3f46adb74509915f57cc71de9eb5.png