python-day4_习题

#习题1：有两个列表，获取其中内容相同的元素列表，l1中有，l2中没有的元素列表，内容都不同的列表 # l1 = [11,22,33] # l2 = [22,33,44] # a = [] # for m in l1: # if m in l2: # a.append(m) # print('l1和l2中都有的元素列表：',a) # b = [] # for m in l1: # if m not in l2: # b.append(m) # print('l1中有，l2中没有的元素列表：',b) # for m in l2: # if m not in l1: # b.append(m) # print('l1和l2中元素不同的列表：',b)#习题2，有1，2，3，4，5，6，7，8，8个数字，能组成多少个互不相同且无重复数字的两位数 # li = [1,2,3,4,5,6,7,8,8] # for i in li: # if li.count(i) > 1: # li.remove(i) # print(li) # all = [] # for i in li: # for j in li: # k = str(i) + str(j) # if i != j: # all.append(int(k)) # print(all) # print(len(all))#习题3，99乘法表 # for i in range(1,10): # s = '' # for j in range(1,i+1): # print(str(j) + 'x' + str(i) + '=' + str(i*j),end='\t') # print()#习题4，公鸡5文钱一只，母鸡3文钱一只，小鸡3只一文钱，用100文钱买100只鸡，其中公鸡、母鸡、小鸡都必须要有，问公鸡、母鸡、小鸡各多少只刚好凑足100文钱。 # gong = 100 // 5 # muji = 100 // 3 # xiaoji = 300 # for i in range(1,gong+1): # for j in range(1,muji+1): # for k in range(3,301,3): # price = i*5 + j*3 + k // 3 # count = i+j+k # if price == 100 and count == 100 : # print('公鸡:',i,'母鸡：',j,'小鸡：',k)#习题5，代码实现使用下划线将列表中每一个元素拼接成字符串 # li = ['alex','eric',123] # for i in range(0,len(li)): # li[i] = str(li[i]) # s = '_'.join(li) # print(s)# l1 = [] # for i in li: # l1.append('_'.join(i)) # print(l1)#习题6，查找列表中元素，移除每个元素的空格，并查找以a或A开头，以c结尾的所有元素 # li = ["alec"," aric","Alex","Tony","rain"] # tu = ("alec"," aric","Alex","Tony","rain",) # dic = {'k1':'alec','k2':' aric','k3':'Alex','k4':'Tony'}# for k,i in dic.items(): # i = i.strip() # if (i.startswith('a') or i.startswith('A')) and i.endswith('c'): # print(k,i)#习题7，请找出列表中任意两个元素相加能够等于9的元素集合 # nums = [2,7,11,15,1,8,7] # li =[] # for i in range(0,len(nums)): # for j in range(i+1,len(nums)): # if nums[i] + nums[j] == 9: # # l =[i,j] # li.append((i,j)) # print(li)#习题8 列表操作 # li = ['alex','eric','rain'] # print('1.列表长度：',len(li)) # li.append('seven') # print('2.new list', li) # li.insert(0,'Tony') # print('3.new list', li) # li[1] = 'Kelly' # print('4.new list', li) # l1 = li.copy() # li.remove('eric') # print('5.new list', li) # v = li.pop(1) # print('5.del value:', v) # li.pop(2) # print('6.new list', li) # del l1[1:4] # print(l1) # l1.reverse() # print(l1)#习题9，通过for循环创建301条数据，数据类型不限，如： # alex-1 alex1@live.com pwd1 # alex-2 alex2@live.com pwd2 # alex-3 alex3@live.com pwd3 #提示用户，请输入要查看的页码，当用户输入指定页码，则显示指定数据。每页显示10条数据，用户输入页码是非十进制数字，则提示输入格式错误 # li = [] # for i in range(1,302): # di = {'name':'alex-'+str(i),'email':'alex'+str(i)+'@live.com','pwd':'pwd'+str(i)} # li.append(di) # while True: # page = input('请输入需要查看的页码：') # if not page.isdecimal(): # print('输入格式错误，请输入十进制数字') # elif int(page) > 31: # print('页数超出总数') # else: # page = int(page) # start = page*10-10 # end = page*10 # for n in li[start:end]: # print(n)# while True: # page = input('请输入需要查看的页码：') # if not page.isdecimal(): # print('输入格式错误，请输入十进制数字') # elif int(page) > 31: # print('页数超出总数') # else: # page = int(page) # break # if page*10 < len(li): # for n in range(page*10-10,page*10): # print(li[page*10-10:page*10]) # else: # for m in range(page*10-10,len(li)): # print(li[m])