1.字符串
用引号括起来的就是字符串，包括单双引号
name = "what is your name?"
print(name.title()) //title函数输出字符串首字母大写
print(name.upper()) //全部大写
print(name.lower()) //全部小写

2.合并（链接）字符串

first_name = "bigbeat"
last_name ="wu"
full_name = first_name + "." +last_name //合并在一个变量
print(full_name)
print("Hello " + full_name.title() + '!')
message = "Hello " + full_name.title() + '!' //也称拼接在一个变量
print(message)

3.用制表符或换行符来添加空白

print("\tbigbeat.wu") // \t制表符：空格；\n换行符
print("my name :\n\tbigbeat.wu")

4.删除空格函数rstrip()：字符串最末尾的空格；lstrip()：字符串最开始的空格

irst_name = " bigbeat"
last_name = "wu "
full_name = first_name + '.' + last_name + '!'
print(full_name)
print(full_name.rstrip()) //并不是把其中某个字符串的末尾空格删掉，而是整个字符串的最末尾空格删掉
print(full_name.lstrip()) //把整个字符串的最开始的空格删掉
first_name = first_name.lstrip()
print(first_name)

5.字符串尽量用双引号
6.str()函数：将非字符串值表示字符串

age = 23
message = "Happy " + str(age) + "rd Birthday!" //将int 转化为字符串
print(message)