英文文档：
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>", line 1, 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>", line 1, 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,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) # 定义了__index__函数，而且返回值是int类型，能转换 >>> 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'
以上就是python内置函数oct详解。