Day05

ATM机交互

1. 插卡

2. 输入密码

3. 选择功能

4. 存款

1 Python的与用户交互

input('请输入瑞星卡号')

input('输入密码')

请输入瑞星卡号5201314
输入密码15236





'15236'

print('*'*100)

****************************************************************************************************

print('*'*100)

input('请插入瑞星卡')

print('_'*100)

****************************************************************************************************
请插入瑞星卡25
____________________________________________________________________________________________________

input 只是一个过渡阶段

vip_card = input('please input VIP card')

print(vip_card)

please input VIP cardasdfghjkl;
asdfghjkl;

print(vip_card)

print(id(vip_card))

print(type(vip_card))

asdfghjkl;
2263780973424
<class 'str'>

无论你输入什么类型，input接受的都是字符串

age = input('请输入你的年龄')

print(age)

print(type(age))

age = int(age)

请输入你的年龄23
23
<class 'str'>

age = age + 1

print(age)

24

2 格式化输出

age = input('age:>>>')
            
print('My age is '+ age)

age:>>>23
My age is 23

age = input('age:')

print('My age is',age)

age:23
My age is 23

name = input('name:')

height = input('height:')

age = input('age:')
            
print('My age is ',age,',My name is',name,',My height is',height)

name:xk
height:185
age:23
My age is  23 ,My name is xk ,My height is 185

2.1 占位符

name = input('name:')

height = input('height:')

age = input('age:')
            
print('My name is %s. My age is %s, My height is %s'%(name,age,height))

name:1
height:1
age:1
My name is 1. My age is 1, My height is 1

name = input('name:')

height = input('height:')

height = int(height)

age = input('age:')

age = int(age)
            
print('My name is %s. My age is %d, My height is %d'%(name,age,height))

name:xc
height:1
age:1
My name is xc. My age is 1, My height is 1

format格式化

name = input('name:')

height = input('height:')

age = input('age:')
            
print('My name is {}. My age is {}, My height is {}'.format(name,age,height))

name:xk
height:185
age:23
My name is xk. My age is 23, My height is 185

f-string格式化

name = input('name:')

height = input('height:')

age = input('age:')
            
print(f'My name is {name}. My age is {age}, My height is {height}')

name:xk
height:23
age:185
My name is xk. My age is 185, My height is 23

print(f'My name is {name}. My age is {int(age)+1}, My height is {height*10}')

My name is xk. My age is 186, My height is 23232323232323232323

print(f'My name is {name}. My age is {int(age)+1:.5f}, My height is {height*10}')

My name is xk. My age is 186.00000, My height is 23232323232323232323

print(f'My name is {"name"}. My age is {int(age) + 1}, My height is {height*10}')

My name is name. My age is 186, My height is 23232323232323232323

基本运算符

算术运算符

比较运算符

赋值运算符

逻辑运算符

身份运算符

算术运算符 加减乘除

比较运算符 大于小于大于等于小于等于 恒等于不等于

#赋值运算符 
x = 2

print(x)

2

#逻辑运算符

#and,or,not

1 <= 1 and 1>=1

True

1 <= 1 or 1>1

True

not'sadsads'

False

#身份运算符 比较的是id

x = 10

y = 10

print(x is y)

True

x = 257

y = 257

print(x is y)

False

x = 10

y = 11

print (x is y)

print(x == y)

False
False

is比较的是id，==比较的是值

python运算符优先级

1*3 > 2*1

True

链式赋值（重要）

x = 10

y = 10

z = 10

print(x,y,z)

10 10 10

x,y,z = 10,10,10

print(x,y,z)

10 10 10

交叉赋值

x = 10

y = 20

z = x

x = y

y = z

print(x,y,z)

20 10 10

x = 10

y = 20

x,y = y,x

print(x,y)

20 10

解压缩

hobby_list = ['reading','666','2333']

print(hobby_list[2])

2333

hobby_list = ['reading','666','2333']

hobby1,hobby2,hobby3 = hobby_list

print(hobby1)

print(hobby2)

rading
666

hobby_list = ['reading','666','2333','999']

_,hobby1,_,hobby2 = hobby_list

print(hobby1)

print(hobby2)

666
999

hobby_list = ['reading','666','2333','999','reading','666','2333','999']

hobby1,*_,hobby2 = hobby_list

print(hobby1)

print(hobby2)

reading
999