day4
作者:互联网
作业回顾:
# 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)View Code
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:
# 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View Code
删:
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View Code
改:
# 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View Code
查:
# 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)View Code
列表的嵌套::
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)View Code
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。
# 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)View Code
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])
标签:太白,alex,女神,day4,li,WuSir,print 来源: https://www.cnblogs.com/tongge/p/11073065.html