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数据类型示例和当天的作用讲解
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
数据类型示例和当天的作用讲解