Program01 基本的输出
作为一种语言的学习,他的仪式感很重要
print("Hello World!")
这就是python3里面的 Hello World! 打印输出
Program02 注释符号的使用
name = "你好,世界" msg = """ print(name) 666 777 888 """ name2 = name+"111" print(name) print(name2) print("My name is",name,"Hello world") print(msg)
输出结果:
你好,世界 你好,世界111 My name is 你好,世界 Hello world print(name) 666 777 888
''' 在python3中 三个连续的引号是多行注释 '''
此程序中可以学到:python3中 ''' 表示多行注释,如果将注释掉的内容赋值给一个变量,
print一下是可以打印输出的,单行注释使用的是 #
Program03 多种方式打印个人信息
name = input("name:") age = int(input("age:")) # integer 将字符串转化为整数型 print( type(age), type( str(age))) job = input("job:") salary = input("salary:") info = ''' -------- info of %s-------- Name: %s age: %d job: %s salary: %s '''%(name,name,age,job,salary) print(info)
输出结果:
name:XiaoBai age:11 <class 'int'> <class 'str'> job:Student salary:1000 -------- info of XiaoBai-------- Name: XiaoBai age: 11 job: Student salary: 1000
name = input("name:") age = int(input("age:")) # integer 将字符串转化为整数型 print( type(age), type( str(age))) job = input("job:") salary = input("salary:") info = ''' -------- info of %s-------- Name: %s age: %d job: %s salary: %s '''%(name,name,age,job,salary) info2 = ''' -------- info of {_name} -------- # 此处下划线仅仅是为了区别name 这一个变量 Name: {_name} age: {_age} job: {_job} salary: {_salary} '''.format(_name = name, _age = age, _job = job, _salary = salary) print(info2)
输出结果:
name:xiaobai
age:11
job:Student
salary:1000
-------- info2 of xiaobai --------
# 此处下划线仅仅是为了区别name 这一个变量
Name: xiaobai
age: 11
job: Student
salary: 1000
name = input("name:") age = int(input("age:")) # integer 将字符串转化为整数型 job = input("job:") salary = input("salary:") info = ''' -------- info of %s-------- Name: %s age: %d job: %s salary: %s '''%(name,name,age,job,salary) info3 = ''' -------- info3 of {0} -------- Name: {0} age: {1} job: {2} salary: {3} '''.format(name,age,job,salary) print(info3) # 打印整段,%s 是段内调用段外的字符串
# 在此方法中输入时,format()中的name只写了一次!
输出结果:
name:xiaobai age:11 job:Stu salary:1000 -------- info3 of xiaobai -------- Name: xiaobai age: 11 job: Stu salary: 1000
总结:
''' 时间 2018年2月6日21:08:12 目的 学习python输入、输出 记录 通过input输入的默认格式是str,可以通过int()强制类型转化为int类型 通过type 可以查询目标元素的格式和类型 三个引号(不区分单双)可以注释一整段,如果将注释掉的内容赋值 给一个变量那么可以打印输出该段内容 使用format的时候不要忘记加 . 灵活运用三种打印输出段落,并对外部内容引用的方式。其中第二种最为常见 而且一个{} 中只写一个变量名称 input("登录用户{m},{n}?".format(m = user_name01,n = user_name02)) correct input("登录用户{m,n}?".format(m = user_name01,n = user_name02)) error '''
Program04 判断语句
''' 时间 2018年2月6日21:14:05 目的 if else 流程判断 记录 隐藏密文 而且python是强制缩进,同级会同时输出 ''' import getpass _username = 'abc' _password = 'abc123' username = input("username:") # password = getpass.getpass("password:") 此时是密文,隐藏密码 password = input("password:") print(username,password)
if _username == username and _password == password: print("Worlcome user {name} login...".format(name = username)) else: print("Invalid username or password!")
输出结果:
username:abc
password:abc123
abc abc123
Worlcome user abc login...
总结:
# if执行语句必须含有缩进,否则会报错!
Program05 while循环语句
''' 时间 2018年2月6日22:03:14 目的 继续测试while 循环 记录 while 循环需要加冒号 ''' age_of_boy = 56 count = 0 while count < 3: guess_age = int(input("guess age:")) if guess_age == age_of_boy: print("yes,you got it.") break elif guess_age > age_of_boy: print("think smaller...") else: print("think bigger...") count += 1 if count == 3: continue_confirm = input("do you want to keep gussing?") if continue_confirm != 'n': count = 0
输出结果:
guess age:10 think bigger... guess age:100 think smaller... guess age:50 think bigger... do you want to keep gussing?n
Program06 for循环语句
''' 目的 测试for 循环 记录 从此可以看出,python中的循环和MATLAB中的循环与构建向量有相似之处 ''' age_of_boy = 56 for i in range(3): guess_age = int(input("guess age:")) if guess_age == age_of_boy: print("yes,you got it.") break elif guess_age > age_of_boy: print("think smaller...") else: print("think bigger...") else: print("you have tried too many times...have a rest") # 特别值得注意的一点是 在python中if-elif-else语句的写法 # break 和 continue的区别是 前者终止当前循环,后者是跳出本次循环,进入下一次循环
输出结果:
think bigger... guess age:70 think smaller... guess age:60 think smaller... you have tried too many times...have a rest
Program07 简易用户登录界面
''' 时间 2018年2月10日19:51:29 目的 制作一个用户登录界面,能够提示用户输入密码,三次出错锁定 # 还有小问题是不会使用python对文件进行增删改查的操作,此次操作的用户名和用户密码最好是在文件中 ''' user_name01 = 'abc' user_name02 = 'bcd' user_pass01 = 'abc123' user_pass02 = 'bcd123' # 用于提示用户被锁住,无法登录 user_flag01 = True user_flag02 = True count = 0 choice = input("登录用户{m},{n}?".format(m = user_name01,n = user_name02)) if choice == user_name01 and user_flag01 is True: while count < 3: pass_01 = input("please input the pass word of {na}:".format(na = user_name01)) if pass_01 == user_pass01: print("congratulations!you passed ") break else: print("try again:") count += 1 else: userflag01 = False print("you hava tried so many times,the id is locked") elif choice == user_name02 and user_flag02 is True: while count < 3: pass_02 = input("please input the pass word of {nb}:".format(nb = user_name02)) if pass_02 == user_pass02: print("congratulations!you passed ") break else: print("try again:") count += 1 else: userflag02 = False print("you hava tried so many times,the id is locked")
输出结果:
登录用户abc,bcd?abc please input the pass word of abc:abcabc try again: please input the pass word of abc:acb123 try again: please input the pass word of abc:abc123 congratulations!you passed
Program08 字典的使用
# 三级菜单的创建 # 思路 通过字典存储 ''' 时间 2018年2月10日20:34:03 目的 创建一个三级菜单 记录 利用函数简化此代码,pass不进行任何操作 总结 2018年2月11日重新编写并运行此代码,发现一些错误 在重新编写之后,发现python是严格的格式对齐语言,如果同时存在while 和 for 的时候, 二者没有区分循环层次,误将二者对齐,则会报错。在之后的一系列测试中发现,循环体的 书写位置也会影响代码的运行结果! ''' data = { '北京':{ "昌平":{ "沙河":["oldboy","test"], "天通苑":["链家地产","我爱我家"] }, "朝阳":{ "望京":["奔驰","陌陌"], "国贸":{"CICC","HP"}, "东直门":{"Advent","飞信"}, }, "海淀":{}, }, '山东':{ "德州":{}, "青岛":{}, '济宁':{ '兖州':["BBQ","TYZY"], '太白':["JNYX","FSYY"] }, '济南':{ '历下':["山大","山交通"], '长清':["山师","山工艺"] } }, } exit_flag = False while not exit_flag: for i in data: print(i) choice = input("选择进入1>>:") if choice in data: while not exit_flag: for i2 in data[choice]: print(" ",i2) choice2 = input("选择进入2>>:") if choice2 in data[choice]: while not exit_flag: for i3 in data[choice][choice2]: print(" ", i3) choice3 = input("选择进入3>>:") if choice3 in data[choice][choice2]: for i4 in data[choice][choice2][choice3]: print(" ",i4) choice4 = input("最后一层,按b返回>>:") if choice4 == "b": pass elif choice4 == "q": exit_flag = True if choice3 == "b": break elif choice3 == "q": exit_flag = True if choice2 == "b": break elif choice2 == "q": exit_flag = True
MYK
2018年2月11日