Python内置函数OCT详解
发布时间:2020-12-16 20:19:23 所属栏目:Python 来源:网络整理
导读:英文文档: 复制代码 代码如下: oct ( x ) Convert an integer number to an octal string. The result is a valid Python expression. If x is not a Pythonobject,it has to define anmethod that returns an integer. 说明: 1. 函数功能将一个整数转换成
英文文档: 复制代码 代码如下: oct ( x )
Convert an integer number to an octal string. The result is a valid Python expression. If x is not a Pythonobject,it has to define anmethod that returns an integer. 说明: 1. 函数功能将一个整数转换成8进制字符串。如果传入浮点数或者字符串均会报错。 >>> a = oct(10) >>> a '0o12' >>> type(a) # 返回结果类型是字符串 <class 'str'> >>> oct(10.0) # 浮点数不能转换成8进制 Traceback (most recent call last): File "<pyshell#3>",line 1,in <module> oct(10.0) TypeError: 'float' object cannot be interpreted as an integer >>> oct('10') # 字符串不能转换成8进制 Traceback (most recent call last): File "<pyshell#4>",in <module> oct('10') TypeError: 'str' object cannot be interpreted as an integer 2. 如果传入参数不是整数,则其必须是一个定义了__index__并返回整数函数的类的实例对象。 # 未定义__index__函数,不能转换 >>> class Student: def __init__(self,name,age): self.name = name self.age = age >>> a = Student('Kim',10) >>> oct(a) Traceback (most recent call last): File "<pyshell#12>",in <module> oct(a) TypeError: 'Student' object cannot be interpreted as an integer # 定义了__index__函数,但是返回值不是int类型,不能转换 >>> class Student: def __init__(self,age): self.name = name self.age = age def __index__(self): return self.name >>> a = Student('Kim',10) >>> oct(a) Traceback (most recent call last): File "<pyshell#18>",in <module> oct(a) TypeError: __index__ returned non-int (type str) # 定义了__index__函数,而且返回值是int类型,能转换 >>> class Student: def __init__(self,age): self.name = name self.age = age def __index__(self): return self.age >>> a = Student('Kim',10) >>> oct(a) '0o12' (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |