Python內置函數OCT詳解
更新時間:2016年11月09日 08:39:23 作者:sesshoumaru
本文給大家介紹的是python中的內置函數oct(),其主要作用是將十進制數轉換成八進制,再變成字符。有需要的小伙伴可以參考下
英文文檔:
復制代碼 代碼如下:
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.
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.
說明:
1. 函數功能將一個整數轉換成8進制字符串。如果傳入浮點數或者字符串均會報錯。
>>> 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
2. 如果傳入參數不是整數,則其必須是一個定義了__index__并返回整數函數的類的實例對象。
# 未定義__index__函數,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,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,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'

