file = open(r".\data\readyou.txt", "w", encoding = 'utf-8')
file.write("w343\n")
file.write("233\n")
file.write("你们好\n")
file.close()
file = open(r".\data\readyou.txt", "a", encoding = 'utf-8')
file.writelines(("54\n", "233\n", "4322\n"))
file.close()
file = open(r".\data\readyou.txt", "r", encoding = 'utf-8')
lines = file.read()
print(lines, end='')
file.close()
with open(r".\data\readyou.txt", "r", encoding = 'utf-8') as file:
content = file.read()
print(content)
line = file.readline()
while line != '':
print(line, end='')
line = file.read.readline()
lines = file.readlines()
print(lines)
for line in file.readlines():
print(line, end='')
with open("data/readme.txt", "w", encoding = 'utf-8') as file:
file.writelines(['abc\n', '212\n', '一二三\n'])
六、练习
通过键盘输入自己的姓名，性别，年龄，爱好
通过write（）函数记录到文本文件中
通过open（）函数读取并显示在控制台
# 练习
person = []
for i in range(1):
name = input("请输入你的姓名：")
sex = input("请输入你的性别：")
age = input("请输入你的年龄：")
fav = input("请输入你的爱好：")
person.append(name+",")
person.append(sex+",")
person.append(age+",")
person.append(fav)
person.append("\n")
# person = [name, sex, age, fav]
with open(r"./data/person.txt", "a", encoding = 'utf') as file:
file.writelines(person)
with open(r"./data/person.txt", "r", encoding = 'utf') as file:
lines = file.readline()
while lines != '':
fields = lines.split(",")
print(f"姓名：{fields[0]}")
print(f"性别：{fields[1]}")
print(f"年龄：{fields[2]}")
print(f"爱好：{fields[3]}")
print("*"*20)
lines = file.readline()
七、CSV模块-读
import csv
with open("./data/test.csv", 'r') as file:
reader = csv.reader(file)
next(reader)
print("姓名\t性别\t年龄")
for row in reader:
print(f"{row[0]}\t{row[1]}\t{row[2]}")
八、CSV模块-写
import csv
with open("./data/test.csv", 'a', encoding= 'utf-8') as file:
writer = csv.writer(file, lineterminator = "\n")
writer.writerow(["mike", "male", "23"])
writer.writerow(([
["make", 'female', '22'],
["tom", "male", '23']
]))
with open("./data/test.csv", 'r') as file:
reader = csv.reader(file, delimiter=';') # 指定分隔符
next(reader)
print("姓名\t性别\t年龄")
for row in reader:
print(f"{row[0]}\t{row[1]}\t{row[2]}")
九、练习
通过键盘输入多名学生的学号，姓名，性别，年龄
记录到CSV文件
读取CSV文件并显示在屏幕上
import csv
with open("./data/students.dat", "a", encoding = 'utf-8') as file:
while True:
id = input("请输入你的学号：")
name = input("请输入你的姓名：")
dex = input("请输入你的性别：")
age = input("请输入你的年龄：")
data = [id, name, dex, age]
writer = csv.writer(file, lineterminator = '\n')
writer.writerow(data)
ret = input("是否继续(y/n)?")
if ret.lower() != 'y':
break
print("文件保存成功！！")
with open("./data/students.dat", "r", encoding = 'utf-8') as file:
reader = csv.reader(file, delimiter = ",")
print("学号\t姓名\t性别\t年龄\t")
for row in reader:
print(f"{row[0]}\t{row[1]}\t{row[2]}\t{row[3]}")
十、综合练习-1
奖客富翁系统
需求描述：
某商场要求开发一套奖客富翁系统，要求客户注册成为商场会员，登录之后，就可以参加抽奖活动
主要功能是有会员注册、登录和抽奖
抽奖采用随机数random.randit(a, b)表示“中奖”和“未中奖”
# 项目一
# 用户注册
import random
users = {}
logined = False
def register():
print("********用户注册*******")
name = input("请输入用户名：")
if name in users:
print("用户名已存在")
return
pwd = input("请输入密码：")
users[name] = pwd
print("注册成功！")
# 登录
def login():
print("********用户登录*******")
name = input("请输入用户名：")
if name not in users:
print("用户不存在")
return
pwd = input("请输入密码：")
if users[name] != pwd:
print("密码错误")
return
print(f'欢迎{name}登录！')
global logined
logined = True
# 抽奖
def prize():
if not logined:
login()
pc = random.randint(0, 1)
if pc == 0:
print("很遗憾，您没有中奖-_-")
else:
print("~恭喜，您中奖了~")
def start():
while True:
print("*"*30)
print("1.注册")
print("2.登录")
print("3.抽奖")
print("4.退出")
print("*"*30)
n = int(input("请选择以上功能号【1-4】："))
match n :
case 1 :
register()
case 2:
login()
case 3:
prize()
case 4:
break
case _:
print("输入错误")
print("~程序结束~")
start()
十一、综合练习-2
汽车租聘系统
需求描述
-------------
# 租车系统 #
2.添加车牌号
3.显示所有的车牌号
4.查找车牌号
5.退出系统
-------------
请选择功能：
def func1():
print("*" * 30)
print('# 租车系统 #')
print('1.添加车牌号')
print('2.显示所有车牌号')
print('3.查找车牌号')
print('4.删除车牌号')
print('5.退出系统')
print("*" * 30)
lists = []
def func2(lists):
n = input("请输入要添加车牌号的个数：")
for i in range(int(n)):
list = input(f"请输入第{i+1}个车牌号：")
lists.append(list)
def func3():
for i in range(len(lists)):
print(lists[i])
def func4():
idcode= input("请输入要查找的车牌：")
if idcode in lists:
print("恭喜，已查找到车牌！")
else:
print("对不起，找不到车牌号！")
def func5():
se_code = input("请输入要删除的车牌号：")
lists.remove(se_code)
print("删除成功！！")
func1()
while True:
code = int(input("请选择功能："))
match code:
case 1:
func2(lists)
case 2:
func3()
case 3:
func4()
case 4:
func5()
case 5:
break
case _:
print("输入不合法，请重新输入！")
print("程序结束！")