python从入门到实践之第2章 变量和简单数据类型

本笔记补充廖雪峰

使用方法修改字符串的大小写
首字母大写

name = "ada lovelace"
print(name.title())

变大小写

name = "Ada Lovelace"
print(name.upper())
print(name.lower())

合并字符串：利用+号

first_name = "ada"
last_name = "lovelace"
full_name = first_name + " " + last_name
print(full_name)

删除空白
暂时删除末尾空白（下一次返回仍有空白）

>>>favourite_language = 'python '
>>>favourite_language.rstrip()

永久删除

>>>favourite_language = 'python '
>>>favourite_language = favourite_language.rstrip()

删除开头空白

  >>>favourite_language = 'python '
   >>>favourite_language.lstrip()

python2.7中的print

>>>print "Hello python 2.7 world"

使用str函数避免错误

age =  23
message = 'Happy' + str(age) + 'rd Birthday'
print(message)