Case study of python list
This article mainly explains "python list case analysis". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let Xiaobian take you to learn "python list case analysis"!
Here are the lists:
Task 1,"Y2K Bug" Here I come Function enumerate
The enumerate() function is used to assemble a traversable data object (such as a list, tuple, or string) into an index sequence, listing both the data and the data subscript, typically used in a for loop.
year=[82,89,88,86,85,00,99]print ('original list', year)for index,value in enumerate(year): print(index,value)
year=[82,89,88,86,85,00,99]print ('original list', year)for index,value in enumerate(year): #print(index,value) if str(value)!= '0': year[index]=int('19'+str(value)) else: year[index]=int ('200 '+str(value))print ('modified list:', year)
Original list: [82, 89, 88, 86, 85, 0, 99]
Modified list: [1982, 1989, 1988, 1986, 1985, 2000, 1999]
year=[82,89,88,86,85,00,99]print ('original list:', year)for index,value in enumerate(year): #print(index,value) if str(value)!= '0': year[index]=int('19'+str(value)) else: year[index]=int ('200 '+str(value))print ('list after modification:',year)#sort of list year.sort()print ('list after sorting:',year)
Original list: [82, 89, 88, 86, 85, 0, 99]
Modified list: [1982, 1989, 1988, 1986, 1985, 2000, 1999]
The sorted list is: [1982, 1985, 1986, 1988, 1989, 1999, 2000]
Task 2. Jingdong Shopping Process Warehousing Operation lst=[]for i in range(0,5): goods=input ('Please input the commodity preparation and commodity name to enter the receipt of commodities. Only one commodity can be input at a time:\n') lst.append(goods)for item in lst: print(item)
Please enter the commodity preparation and commodity name to enter the commodity receipt. You can only enter one commodity at a time:
1001 mobile phone
Please enter the commodity preparation and commodity name to enter the commodity receipt. You can only enter one commodity at a time:
1002 watch
Please enter the commodity preparation and commodity name to enter the commodity receipt. You can only enter one commodity at a time:
1003 portable watch
Please enter the commodity preparation and commodity name to enter the commodity receipt. You can only enter one commodity at a time:
1004 Laptop
Please enter the commodity preparation and commodity name to enter the commodity receipt. You can only enter one commodity at a time:
1005 flashlight
1001 mobile phone
1002 watch
1003 portable watch
1004 Laptop
1005 flashlight
lst=[]for i in range(0,5): goods=input ('Please input the commodity preparation and commodity name to enter the receipt of commodities. Only one commodity can be input at a time:\n') lst.append(goods)for item in lst: print(item)cart=[]while True: num=input ('Please enter the item number you want to buy:') for item in lst: if item.find(num)!=- 1: cart.append(item) break#exit for if num=='q': break#exit while loop print ('The items selected in your cart are:')''for m in cart: print(m)'''for i in range(len(cart)-1,-1,-1): print(cart[i])
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