Python basestring函数- Python零基础入门教程

￡神魔★判官ぃ 2023-01-23 06:51 6阅读 0赞

*  一.Python basestring 函数介绍
 *  二.Python basestring 函数使用
 *  三.Python3 异常: name ‘basestring’ is not defined
 *  四.猜你喜欢

> 零基础 Python 学习路线推荐 : [Python 学习目录][Python] >> [Python 基础入门][Python 1]

## 一.Python basestring 函数介绍 ##

[ basestring 函数][basestring]是 str 和 unicode 的父类，是抽象类，**因此不能被调用和实例化，但可以被用来判断一个对象是否为 str 或者 unicode 的实例**，语法如下：

basestring()

如果想用来检查类型可以使用 [isinstance 函数][isinstance]，使用方法如下：

isinstance(obj, basestring)  # 等价于 isinstance(obj, (str, unicode))

## 二.Python basestring 函数使用 ##

# !usr/bin/env python
    # -*- coding:utf-8 _*-
    """
    @Author:猿说编程
    @Blog(个人博客地址): www.codersrc.com
    @File:Python basestring 函数.py
    @Time:2021/04/17 07:37
    @Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！
    
    """
    
    print isinstance('猿说python',str)                   #True
    print isinstance('www.codersrc.com',unicode)         #False
    print isinstance(u'codersrc.com',unicode)            #True
    print isinstance('python教程',basestring)            #True
    print isinstance(u'python基础',unicode)              #True
    print isinstance(u'python开发',basestring)           #True
    print isinstance(b'python',basestring)               #False

**注意：**

*  \*\* 如果字符串前面以 u 开头，表示 unicode 字符；\*\*
 *  \*\* 如果字符串前面以 b 开头，表示 byte 字符；\*\*
 *  \*\* 如果字符串前面没有字符修饰，默认就是常规字符串；\*\*

## 三.Python3 异常: name ‘basestring’ is not defined ##

看上面代码即可知道，这是 Python2.0 的写法，因为内置函数 basestring 属于 Python2.0 版本，[Python3.0][] 之后已经没有该内置函数，所以会报错，当作了解即可！

## 四.**猜你喜欢** ##

1.  [Python for 循环][Python for]
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3.  [Python 列表 list][Python _ list]
4.  [Python 元组 tuple][Python _ tuple]
5.  [Python 字典 dict][Python _ dict]
6.  [Python 条件推导式][Python 3]
7.  [Python 列表推导式][Python 4]
8.  [Python 字典推导式][Python 5]
9.  [Python 函数声明和调用][Python 6]
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11. [Python 匿名函数 lambda][Python _ lambda]
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14. [Python 局部变量和全局变量][Python 8]
15. [Python type 函数和 isinstance 函数区别][Python type _ isinstance]
16. [Python is 和 == 区别][Python is _ _]
17. [Python 可变数据类型和不可变数据类型][Python 9]
18. [Python 浅拷贝和深拷贝][Python 10]

未经允许不得转载：[猿说编程][Link 1] » [Python basestring 函数][basestring]

[Python]: https://www.codersrc.com/python
[Python 1]: https://www.codersrc.com/pythonsimple
[basestring]: https://www.codersrc.com/archives/5884.html
[isinstance]: https://www.codersrc.com/archives/5205.html
[Python3.0]: https://www.codersrc.com/
[Python for]: https://www.codersrc.com/archives/4953.html
[Python 2]: https://www.codersrc.com/archives/4996.html
[Python _ list]: https://www.codersrc.com/archives/5061.html
[Python _ tuple]: https://www.codersrc.com/archives/5088.html
[Python _ dict]: https://www.codersrc.com/archives/5114.html
[Python 3]: https://www.codersrc.com/archives/5346.html
[Python 4]: https://www.codersrc.com/archives/5359.html
[Python 5]: https://www.codersrc.com/archives/5377.html
[Python 6]: https://www.codersrc.com/archives/5405.html
[Python _ _argc_kargcs]: https://www.codersrc.com/archives/5443.html
[Python _ lambda]: https://www.codersrc.com/archives/5756.html
[Python return]: https://www.codersrc.com/archives/5759.html
[Python 7]: https://www.codersrc.com/archives/5137.html
[Python 8]: https://www.codersrc.com/archives/5156.html
[Python type _ isinstance]: https://www.codersrc.com/archives/5214.html
[Python is _ _]: https://www.codersrc.com/archives/5288.html
[Python 9]: https://www.codersrc.com/archives/5271.html
[Python 10]: https://www.codersrc.com/archives/5492.html
[Link 1]: https://www.codersrc.com