Python3 implements the shopping cart applet. After optimization, the program is divided into functions, and the file is used to register and verify the user name and password.
#! / usr / bin / env python
#-*-coding: utf-8-*-
# @Time: 2020/4/20 4:12 pm
# @Author: hk
# @Site:
# @File: shopping cart. py
# @Software: PyCharm
"" "
Description of requirements:
1. Enter the correct account number and password, enter the shopping cart to shop
2. Login failed, re-enter account password
3. The same account failed to log in more than three times, then lock the account
4. Login The account is locked, it prompts that the account is locked
"" "
#Display the
purchased goods list function def shoping_list (myshping, money):
print ('============= Your shopping list is as follows ============== === ')
dic1 = {}
for i in myshping:
if dic1.get (i) == None:
dic1 [i] = 1
else:
dic1 [i] + = 1
for k, v in dic1.items () :
print (k, v)
print ("============================================ === \ nYour balance:% d "% money)
#Shopping
cart function def shoping ():
goods = [{'name': 'Computer', 'price': 1999},
{'name': 'Mouse ',' price ': 10},
{' name ':' Yacht ',' price ': 20},
{' name ':' Beauty ',' price ': 998},
{'name': 'iphone', 'price': 5000},
]
flag = False
my_shopping = []
while True:
money = input ("Please enter your amount: \ n")
if not money.isdigit ():
keys = input ("Wrong input, please press any key to re-enter, or Enter q to exit the purchase \ n ")
if keys.upper () == 'Q':
break
continue
money = int (money)
while True:
print ('+++++++++++ Product list +++ ++++++++++ ')
for index, key in enumerate (goods):
print (index + 1, key [' name '], key [' price ']) # The value obtained by key here is Each row of the dictionary, and then press the key value of the key dictionary to print out the product details
print ('my wallet balance', money)
num = input ("Please enter the serial number of the product you want to buy: [or enter q to end the purchase] \ n ")
if num.upper () == 'Q':
flag = True
break
if not num.isdigit ():
print ("Input error, please re-enter!")
continue
num = int (num)
if num> 0 and num <len (goods ) + 1:
# print (num, "Start shopping \ n ----------")
if money> = goods [num-1] ['price']:
my_shopping.append (goods [num- 1] ['name'])
money = money-goods [num-1] ['price']
shoping_list (my_shopping, money)
# print (my_shopping, "My Balance", money)
else:
# print ("Insufficient balance ")
while True:
chongzhi = input ("Insufficient balance, please enter the recharge amount: [or enter q to end the purchase.] \ n")
if chongzhi.upper () == "Q":
flag = True
break
if not chongzhi.isdigit ():
# keys_1 = input ("The input is incorrect, please re-enter the recharge amount: or enter q to end the purchase ... Error] ")
# if keys_1.upper () ==" Q ":
# flag = True
# break
print (" Input error, please re-enter ")
continue
money = money + int (chongzhi)
break
# break
if flag == True:
break
else:
print ("Please enter the correct product number")
continue
if flag == True:
# Print out the shopping list and make statistics, showing the balance.
print ("Thank you for coming!")
shoping_list (my_shopping, money)
exit (0)
continue
#Registration
function def regist ():
"" "
Registered user
name: User name
password: User password
: return:
" ""
# Read user File
with open ("user.txt", encoding = 'utf-8', mode = "r") as read_file:
read_data = read_file.
i_line = i.strip (). split (',')
while True:
username = input ('Please enter user name: \ n'). strip ()
if username in i_name:
print ('User name already exists, please retry Enter. ')
Continue
else:
password = input (' Please enter the password: \ n ').
Strip () with open (' user.txt ', encoding =' utf-8 ', mode =' a ') as read_f1:
new_user = [username, password, '0']
new_user = '\ n' + ','. join (new_user)
# print (new_user, type (new_user))
read_f1.write (new_user)
print ('% s, congratulations Successful registration, please log in '%username)
break
number of user logins The function
def modify_user (name,mode="add"):
"""
Modify the number of login errors in the user list
: param name: user name
: param mode: add, the number of login errors is incremented by 1; del, the number of login errors is reset to 0
: return:
"" "
# read user files
with open ( "user.txt", encoding = 'utf-8', mode = "r") as read_file:
read_data = read_file.readlines ()
# Write user file
with open ("user.txt", encoding = 'utf-8 ', mode = "w") as write_file:
for line in read_data:
new_line = line.split (', ')
if new_line [0] == name:
if mode == "add":
new_line [2] = int ( new_line [2]) + 1
new_line [2] = str (new_line [2])
new_line[2] = "0"
print(">>>>>>>",new_line)
else:
print ("Dear [% s], you are welcome to log in to this shopping cart "% name)
new_line = ",".join(new_line) + "\n"
write_file.write(new_line)
# print('写入',new_line)
write_file.flush()
else:
write_file.write(line)
#验证用户名密码函数
def auth(name, passwd):
with open("user.txt", encoding='utf-8',mode="r") as read_file:
for eachLine in read_file:
user_name, password, errors = eachLine.strip().split(',')
if name == user_name:
if int(errors) < 3:
if password == passwd:
modify_user(name, "del")
shoping ()
# return True
else:
print ("Password is wrong, please re-enter username and password!")
modify_user (name, "add")
return False
else:
print ("Your user is locked, please Contact the administrator! ")
Return False
else:
print (" Username does not exist, please re-enter! ")
Return False
def login ():
while True:
name = input (" Please enter user name: ")
passwd = input ( "Table Enter Password:")
if auth (name, passwd):
break
def menu() :
while True:
mode = input ('Please register or log in: \ n'
'Registration selection 1 \ n'
'Login select 2 \ n'
'or press q to exit \ n'). strip ()
if mode == '1':
regist ()
elif mode == '2':
login ()
elif mode.upper () == 'Q':
exit (0)
else:
print ("Input error, please re-enter, or press q to exit.")
Continue
if __name__ == '__main__' :
menu ()
user.txt file content
hp, 123.2
abc,222,2
haha,1,1
test,1234,0