Python第一天

一、变量
# print("hello world")
# age=18
# #定义一个变量,会有2个特征:id,type,value
# print(id(age),type(age),age)(查看变量的类型)
# name="egon"
# print(id(name),type(name),name)

#变量的命名方式:
# 1.驼峰体
# AgeOfolaboy=73
# 2下划线
# age_of_oldboy=73

#常量(大写方式)
# AGE_OF_OLDBOY=73
# #AGE_OF_OLDBOY=71
# print(AGE_OF_OLDBOY)

二、用户与程序交互
#!/usr/bin/env python
#coding:utf-8(python2解决raw_input报错,在文档第一行写coding:utf-8)
#在Python3中,无论输入何种类型,都会存成字符串类型
# name=input('please input your name:')
# print(id(name),type(name),name)
#在python2中,raw_input与Python3的input一样
# name=raw_input('please input your name:')
# print (id(name),type(name),name)
#python2中input,用户必须输入值,输入的是什么类型,就存成什么类型
# name=input('please input your name:')
# print (id(name), type(name), name)

三、基本数据类
#数字类

#int整型类型:身份证号,QQ号,等级等;只能存一个值,没有顺序,不可变
#age=18 #age=int(18)
#float浮点型:身高,体重,薪资等;存一个值,没有顺序,不可变
#height=1.81
# height=float(1.81)
# print(type(height),height)

#字符串类型:把一堆字符放到单引号或者双引号或者三引号中
#表示一些描述性的状态,比如人的名字,性别
# name="egon"#(注意用英文字符)
# print(type(name))
#
# comment='''
# 老男孩的Alex,买了一辆车,然而。。。
# '''
#msg="i'm ok"

#字符串拼接:
#1只能字符串之间拼接
#2字符串之间只能用+或者*
# name='egon'
# msg='hello'
# age=18
# print(name+msg+str(age))
# print(name*10)


#列表:定义在【】内,用逗号分隔开的多个元素,每个元素可以是任意类型
#用来表示存取多个值,比如人的爱好,人的信息
# hobbies=['play', 'read','music','movie']
# print(hobbies [0])
# print(hobbies [3])

# l=[1,1.3,'ha',['a','b']]
# print(l[3][1])

# id name sex hobbies
# info=[1311221994,'ling','male',['music','read']]
# print(info[1])

#字典:定义在{}内,用key=value形式表示一个元素,用逗号隔开
# info={'id':1311221994,'name':'ling','sex':'male','hobbies':['music','read']}
# print(info['name'])
# print(info['hobbies'][1])

#布尔类型
#print(type(True))
# AGE=72
# age=18
# print(age>AGE)
# print(age<AGE)

#bool值:所有的数据类型都自带bool值
#bool值为假的情况:1、对于数字来说0的时候为假。2、空列表、空集合、空字符串。。。。为假3、none
x=1
print(bool(x))
if x:
print('ok')


四、格式化输出
#my name is ***,my age is ***

# name=input('user_name:')
# age=input('user_age:')
#print('my name is %s,my age is %s'%(name,age))相当于print('my name is %s,my age is %s'%('ling','23'))
#print('my name is %s,my age is %s'%('ling',23))%s占位符可以接收字符串str与整型的int
print('my name is %s,my age is %d'%('ling',23))%d占位符只可以接收整型的int
五、基本运算符
# a=10
# b=3
# print(a+b)
#print(a/b)#真正的除法,有整数有余数
#print(a//b)#地板除,只有整数
# print(a%b)
# print(a*b)

#比较运算
#age=23
# print(age>70)
# print(age<70)
# print(age!=70)
# print(age==70)

#赋值运算
# height=180
# height+=1#height=height+1
# print(height)


#逻辑运算
# name='ling'
# age=23
# print(name=='ling1' and age>20)
# print(name=='ling2' or age>20)

age=11
print(not age>5)
六、流程控制之if...else语句
# age=input('输入年龄:')
# age=int(age)
# if age>30:
# print('叫阿姨')
# else:
# print('叫美女')

# sex=input('sex>>:')
# age=int(input('age>>:'))
# is_pretty = True
# if sex == 'female'and age>18 and age<30 and is_pretty == True:
# print('表白中')
# else:
# print('叫阿姨')


# sex=input('sex>>:')
# age=int(input('age>>:'))
# is_pretty = bool(input('is pretty:'))
# if sex == 'female'and age>18 and age<30 and is_pretty == True:
# print('表白中')
# else:
# print('叫阿姨')



#if嵌套
# sex=input('sex>>:')
# age=int(input('age>>:'))
# is_pretty = bool(input('is pretty:'))
# success=True#(满足条件1的情况下,打印在一起)False(满足条件1的情况下,打印去你妈的爱情)
# if sex == 'female'and age>18 and age<30 and is_pretty == True:#(条件1)
# if success:
# print('在一起')
# else:
# print('去你妈的爱情')
# else:
# print('叫阿姨')

#if多分支
# score=int(input('your score>>:'))
# if score>=90:
# print('优秀')
# elif score>=80:
# print('良好')
# elif score>=70:
# print('及格')
# else:
# print('太差')



# name=input('please input your name:')
# password=input('please input your password:')
# if name=='ling' and password=='123':
# print('登陆成功')
# else:
# print('用户名或密码错误')


# '''
# ling -管理员
# mei - 职员
# zhang,liu- 主管
# 其他 - 普通用户
# '''
# name=input('输入用户名:')
# if name=='ling':
# print('管理员')
# elif name=='mei':
# print('职员')
# elif name=='zhang'or name=='liu':
# print('主管')
# else:
# print('普通用户')


# today=input('>>:')
# if today in ['Monday','Tuesday','Wednesday','Thursday','Friday']:
# print('上班')
# elif today in ['Saturday','Sunday']:
# print('出去浪')
# else:
# print('''必须输入其中一种:
# Monday
# Tuesday
# Wednesday
# Thursday
# Friday
# Saturday
# Sunday''')
七、流程控制之while循环
# AGE_OF_OLDBOY=73
# guess=int(input('>>:'))
# if guess > AGE_OF_OLDBOY:
# print('太大了,往小里猜')
# elif guess < AGE_OF_OLDBOY:
# print('太小了,往大里猜')
# else:
# print('恭喜你,猜对了')

#while:条件循环
# while 条件:
# 循环体
# count=0
# while count<3:
# print('loop',count)
# count+=1

#break跳出本层循环(打印0-100)
# count=0
# while True:
# if count>100:
# break
# print(count)
# count+=1

# #continue:跳出本次循环(打印1-10,7不打印)
# count=0
# while count <= 10:
# if count == 7:
# count+=1
# continue
# print(count)
# count+=1

#while+else
# count=0
# while count <=10:
# if count==3:
# break
# print(count)
# count+=1
# else:
# print('while正常结束了,没有被break打断,才会执行这里')
#注意一
# count=0
# while count <=5:
# print(count)
# count+=1
# #continue加到这里没有意义

#注意二
#用户登陆,输入正确用户密码可直接登陆,输入错误3次则退出
# name='ling'
# password='123'
# count=0
# while count<3:
# u=input('输入用户名:')
# p=input('输入登陆密码:')
# if u == name and p == password:
# print('登陆成功')
# break
# else:
# print('用户名或密码错误')
# count+=1




#同上
name='ling'
password='123'
count=0
while True:
if count == 3:
break
u=input('输入用户名:')
p=input('输入登陆密码:')
if u == name and p == password:
print('登陆成功')
break
else:
print('用户名或密码错误')
count+=1

#登陆后可以操作命令
# name='ling'
# password='123'
# count=0
# while True:
# if count == 3:
# break
# u=input('输入用户名:')
# p=input('输入登陆密码:')
# if u == name and p == password:
# print('登陆成功')
# while True:
# cmd=input('>>:')
# if cmd == 'quit':
# break
# print('run%s'%cmd)
# break
# else:
# print('用户名或密码错误')
# count+=1

#同上
# name='ling'
# password='123'
# count=0
# tag=True
# while tag:
# if count == 3:
# break
# u=input('输入用户名:')
# p=input('输入登陆密码:')
# if u == name and p == password:
# print('登陆成功')
# while tag:
# cmd=input('>>:')
# if cmd == 'quit':
# tag=False
# continue
# print('run%s'%cmd)
#
# else:
# print('用户名或密码错误')
# count+=1
 
posted @ 2017-09-06 09:44  墙角烤番薯  阅读(359)  评论(0编辑  收藏  举报