Python字符串

字符串就是一系列字符。在Python中，用引号括起来的都是字符串，其中的引号可以是单引号，也可以是双引号，如下所示：

'This is a string.'
"This is also a string."

这种灵活性让你能够在字符串中包含引号和撇号：
‘I told my friend , “Python is my favorite language!”’
“The language ‘Python’ is named after Monty Python,not the snake.”
“One of Python’s strengths is its diverse and supportive community.”

字符串大小写

message = "hello python!"

# 原始字符串

print(message)

# 单词首字母大写

print(message.title())

# 全部大写

print(message.upper())


# 全部小写
print(message.lower())

程序运行输出

hello python!
Hello Python!
HELLO PYTHON!
hello python!

合并（拼接）字符串
可以用+号连接

first_name = "Bill"

last_name = "Gates"

print(first_name + " " + last_name)

程序运行输出

Bill Gates

删除空白

language = " Python "

# 去掉左边空格

print(language.lstrip())

# 去掉右边空格

print(language.rstrip())

# 去掉左右两边空格

print(language.strip())

程序运行输出

Python 
 Python
Python