数据类型示例和当天的作用讲解

Posted 2020-09-21

一 数据类型示例

 n=1

#

# f=1.3

#

# print(type(n))

# print(type(f))

 

# print(1.3e-3)

# print(1.3e3)

 

#3

 

# print(bin(10))

#

# print(oct(10))

# # 0-9 a b c d e f

# print(hex(10))

 

 

 

#数字类型的特点：

# 1.只能存放一个值

#

# 2.一经定义，不可更改

#

# 3.直接访问

# x=10123123123

# print(id(x))

# x=11

# print(id(11))

 

 

#字符串类型：引号包含的都是字符串类型

#需要掌握的常用操作：

‘‘‘

msg=‘hello‘

移除空白 msg.strip()

分割msg.split(‘|‘)

长度len(msg)

索引msg[3] msg[-1]

切片msg[0:5:2]  #0  2  4

 

‘‘‘

 

 

# s=‘hello world‘

# s1="hello world"

# s2="""hello world"""

# s3=‘‘‘hello world‘‘‘

# print(type(s))

# print(type(s1))

# print(type(s2))

# print(type(s3))

 

 

x=‘*****egon********‘

 

# x=x.strip()

# print(x)

# print(x.strip(‘*‘))

 

#首字母大写

# x=‘hello‘

# print(x.capitalize())

 

#所有字母大写

# x=‘hello‘

# print(x.upper())

 

# #居中显示

# x=‘hello‘

# print(x.center(30,‘#‘))

 

#统计某个字符的长度，空格也算字符

# x=‘hel lo love‘

# print(x.count(‘l‘))

# print(x.count(‘l‘,0,4)) # 0 1 2 3

 

 

 

# x=‘hello ‘

# print(x.endswith(‘ ‘))

# print(x.startswith())

 

# x=‘hello ‘

# print(x.find(‘e‘))

# print(x.find(‘l‘))

 

#格式化字符串

# msg=‘Name:{},age:{},sex:{}‘

# print(msg) #Name:{},age:{},sex:{}

# print(msg.format(‘egon‘,18,‘male‘))

 

 

# msg=‘Name:{0},age:{1},sex:{0}‘

# print(msg.format(‘aaaaaaaaaaaaaaaaa‘,‘bbbbbbbbbbbbbb‘))

 

 

 

# msg=‘Name:{x},age:{y},sex:{z}‘

# print(msg.format(y=18,x=‘egon‘,z=‘male‘))

 

 

 

x=‘hello world‘

# print(x[0])

# print(x[4])

# print(x[5])

# print(x[100]) #报错

 

# print(x[-1])

# print(x[-3])

# print(x[1:3])

# print(x[1:5:2])

 

 

# x=‘hello‘

# print(x.index(‘o‘))

# print(x[4])

# print(x[x.index(‘o‘)])

 

# x=‘123‘

# print(x.isdigit())

#

# age=input(‘age: ‘)

# if age.isdigit():

#     new_age=int(age)

#     print(new_age,type(new_age))

 

 

 

msg=‘hello alex‘

# print(msg.replace(‘x‘,‘X‘))

# print(msg.replace(‘alex‘,‘SB‘))

# print(msg.replace(‘l‘,‘A‘))

# print(msg.replace(‘l‘,‘A‘,1))

# print(msg.replace(‘l‘,‘A‘,2))

 

 

#补充

# x=‘a‘ #x=str(‘a‘)

# str.replace()

 

 

# x=‘hello          world alex SB‘

# x=‘root:x:0:0::/root:/bin/bash‘

# print(x.split(‘:‘))

 

 

 

 

 

# x=‘hello‘

# # print(x.upper())

# x=‘H‘

# print(x.isupper())

x=‘HELLO‘

# print(x.islower())

# print(x.lower())

 

 

x=‘     ‘

# print(x.isspace())

 

msg=‘Hello‘

msg=‘hEEEE‘

# print(msg.istitle())

 

 

# x=‘abc‘

# print(x.ljust(10,‘*‘))

# print(x.rjust(10,‘*‘))

 

# x=‘Ab‘

# print(x.swapcase())

#

# x=‘hello‘

# print(x.title())

 

 

 

二 作业讲解

使用while循环输出1 2 3 4 5 6     8 9 10

# count=1

# while count < 11:

#     if count == 7:

#         count+=1

#         continue

#     print(count)

#     count+=1

 

#

# count=1

# while count < 11:

#     if count != 7:

#         print(count)

#     count+=1

 

 

#求1-100的所有数的和

 

# count=1

# res=0

# while count <= 100:

#     res+=count

#     count+=1

# print(res)

#

# res=0

# for i in range(1,101):

#     res+=i

# print(res)

 

#

# count=1

# while count <= 100:

#     if count % 2 == 0:

#         print(count)

#     count+=1

 

# count=1

# res=0

# while count <= 4:

#     if count % 2 ==0:

#         res-=count

#     else:

#         res+=count

#     count+=1

#

# print(res)

 

 

 

# count=1

# while count <= 3:

#     u=input(‘u>>: ‘)

#     p=input(‘p>>: ‘)

#     if u == ‘egon‘ and p == ‘123‘:

#         print(‘login ok‘)

#         break

#     count+=1

 

 

 

count=0

 

while True:

    if count == 3:

        print(‘try too many times‘)

        break

    u=input(‘u>>: ‘)

    p=input(‘p>>: ‘)

    if u == ‘egon‘ and p == ‘123‘:

        print(‘login ok‘)

        break

    count+=1