一、Python的变量
1、不用指定变量类型,直接赋值,
example1:
name=1
name=“message”
2、对同一个变量赋值先赋予的数值会被后一个数值覆盖
example1:
message=“Python is a great language”
message=“I like it”
print(message)
显示的结果是I like it
二、Python的数据类型
1、字符串
(1)用单引号或是双引号括起来的内容“this is a string”or‘this is also a string’都是字符串
(2)字符串的方法
mystring="i want to learn python well"
a:字符串的title()方法:将字符串的首字母大写
源代码:
mystring="i want to learn python well"
result=mystring.title()
print (result)
b:字符串的upper()方法:将字符串的所有字母转换为大写
字符串的lower()方法:将字符串的所以字母转换为小写
源代码:
mystring="i want to learn python well"
result=mystring.upper()
print("upper方法的结果是:"+result)
c:拼接字符串:“+”
源代码:
firstname="wang"secondname="lin"name=firstname+secondnameprint(name)
firstname="wang"secondname="lin"name=firstname+secondnameprint(name)
d:使用制表符或换行符号来增加空白
源代码:
print("pyth\ton")
print("pythton")
print("p\ny\nt\nh\no\nn")
e:删除字符串中的空白字符:strip
favorite_language="python " length=favorite_language.__len__() lengthafter=favorite_language.strip() c=lengthafter.__len__() print(length) print(c)