变量：

五．注意：python是可执行程序 在linux写python第一行必须写#!/usr/bin/env python(声明解释器在windows中写python第一行需要写# -*- coding:utf-8 -*-

Pycharm:开发调试效率高  在pycharm中new project 并且每天创建一个目录右键diectory命名为day1

(1).在day1中创建一个程序  右键new python file命名为var 注意如果想在python中想要有模板  可以在view中点击toolbar点击小工具选项editor选择file and code templates选择python scpipt写上自己想要的模板  点击apply选择ok

(2)可以输出hello 运行

六．变量var定义规则：变量名只能是字母、数字或下划线的任意组合

变量名的第一个字符不能是数字

以下关键字不能声明为变量明

注释单行#注释多行‘’‘。。。’‘’

七．用户输入

#用户输入三种格式  第一种输入方法

#username = input('username:')

#username = input('password:')

#print(username,password)

#用户输入格式 第二种输入方法

#n1ame = input('name:')

#age = input ('age:')

#job = input('job:')

#salary = input('salary')

#info = '''

#------- info of $ ------

#name:

#age:

#job:

#salary:

#'''

#亦或者是这个用户输入方式

# name = input('name:')

#age = input ('age:')

#job = input('job:')

#salary = input('salary')

#info = '''

#------- info of '''+name+'''------

#name:'''+age+'''

#age:'''+job+'''

#job:'''+salary

#'''

#亦或是第三种方式输入

#name = input('name:')

#age = input ('age:')

#job = input('job:')

#salary = input('salary:')

#info = '''

#------- info of %s ------

#name:%s

#age:%s

#job:%s

#salary:%s

#''' % (name,name,age,job,salary)

#print(info)

#%s=string %d代表只接受数字 帮助监测数据类型 %d再次执行 这样执行会报错not str

#name = input('name:')

#age = input ('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)

#解决上面数字类型报错问题name = input('name:')

age = int(input ('age:'))#强制转换成数字 int=integer整形print(type(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)

#以上执行结果是正确的

#把整形转换成字符串name = input('name:')

age = int(input ('age:'))#强制转换成数字 int=integer整形print(type(age)    ,type(   str(age) ))#强制转换成上面那一种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)

#info2写入用户输入fromos importname

ame = input('name:')

age = input ('age:')

job = input('job:')

salary = input('salary:')

info2 = '''

------- info of  {_name} ------

name:{_name}

age:{_age}

job:{_job}

salary:{_salary}

'''.format(_name=name,

_age=age,

_job=job,

_salary=salary)

print(info2)#以上是info2的用户输入

#info3写入方法fromos importname

name = input('name:')

age = input ('age:')

job = input('job:')

salary = input('salary:')

info3 = '''

------- info of  {0} ------

name:{0}

age:{1}

job:{2}

salary:{3}

'''.format(name,age,job,salary)

print(info3)#以上是info3的用户输入方式

#input的三种格式 info info2 info3

#用户密文密码importgetpass(getpass语句)

username = input('username:')

password = getpass.getpass('password:')

print(username,password)

#密文密码最好用cmd命令行敲出 在pycharm使用不来 命令行是 d: cd 根目录  再dir一下

#然后敲出python var.py(存放密文密码的路径)

十二．If else流程判断

#十二.if else流程判断_username = 'hansha'_password = '1234'username = input('username:')

password = input('password:')

print(username,password)

if_username == username and_password == password:

print('welcome user{name}login...'.format(name=username))

else:

print('invalid username or password!')

#if else猜测年龄age_of_oldboy = 30

guess_age = int(input('guess age:'))

ifguess_age == age_of_oldboy :

print('yes,you got it.')

elifguess_age > age_of_oldboy:

print('think smaller...')

else:

print('think bigger!')

十三.while循环语句

#count = 0

#while True :

#    print('count:',count)

#    count = count +1 #count + =1

#     if count == 1000:

#        break

#猜测年龄加上while循环语句age_of_oldboy = 56

count = 0

while True:#while循环语句ifcount ==3:#可执行三次break#猜测三次结束guess_age = int(input('guess age:'))

ifguess_age == age_of_oldboy :

print('yes,you got it.')

break#猜对结束elifguess_age > age_of_oldboy:

print('think smaller...')

else:

print('think bigger!')

count +=1#while循环结束语句

#while循环语句优化age_of_oldboy = 56

count = 0

while True:#while循环语句ifcount <3:#和上段代码比较  优化的语句break#猜测三次结束guess_age = int(input('guess age:'))

ifguess_age == age_of_oldboy :

print('yes,you got it.')

break#猜对结束elifguess_age > age_of_oldboy:

print('think smaller...')

else:

print('think bigger!')

count +=1#while循环结束语句

else：print ('你试了太多次 已结束')

#while循环改成for循环  摘抄上段while循环语句代码age_of_oldboy = 56

fori inrange(3) :

guess_age = int(input('guess age:'))

ifguess_age == age_of_oldboy :

print('yes,you got it.')

break

elifguess_age > age_of_oldboy:

print('think smaller...')

else:

print('think bigger!')

else:

print ('你试了太多次 已结束')

#for循环隔开循环fori inrange(0,10,2):#0到10 隔开2个数字写出一个print('loop',i)

#循环猜测用户猜错三次是否继续小游戏age_of_oldboy = 56

count = 0

whilecount <3:#while循环语句guess_age = int(input('guess age:'))

ifguess_age == age_of_oldboy :

print('yes,you got it.')

break#猜对结束elifguess_age > age_of_oldboy:

print('think smaller...')

else:

print('think bigger!')

count +=1#while循环ifcount == 3:

countine_confirm = input ('do you want to keep guessing...?')#当用户已经猜错三次之后询问用户是否继续猜测ifcountine_confirm != 'n':#!=是不等于 如果用户输入n 确定不继续count =0

十四. continue and break

#十四continue and break'''for i in range(0,10):

if i <3:

print('loop',i)

else :

continue

print('hehe')#continue跳出本次循环，继续下一循环 break结束整个循环'''