>>> a = oct(10)>>> a'0o12'>>> type(a) # 返回結果類型是字符串<class 'str'>>>> oct(10.0) # 浮點數(shù)不能轉換成8進制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') # 字符串不能轉換成8進制Traceback (most recent call last): File "<pyshell#4>", line 1, in <module>  oct('10')TypeError: 'str' object cannot be interpreted as an integer

# 未定義__index__函數(shù)，不能轉換>>> 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>", line 1, in <module>  oct(a)TypeError: 'Student' object cannot be interpreted as an integer# 定義了__index__函數(shù)，但是返回值不是int類型，不能轉換>>> class Student:  def __init__(self,name,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>", line 1, in <module>  oct(a)TypeError: __index__ returned non-int (type str)# 定義了__index__函數(shù)，而且返回值是int類型，能轉換>>> class Student:  def __init__(self,name,age):    self.name = name    self.age = age  def __index__(self):    return self.age>>> a = Student('Kim',10)>>> oct(a)'0o12'