int在python 3.x和django-1.9上使用base64編碼的字符串int

Question

我使用python 3.4和django-1.9。我需要int來串和base64編碼。

代碼：

new_key = base64.b64encode(str(key)) 

錯誤：

Traceback (most recent call last): 
    File "/home/mehmet/Envs/ets-3/lib/python3.4/site-packages/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/home/mehmet/Envs/ets-3/lib/python3.4/site-packages/django/core/handlers/base.py", line 147, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/home/mehmet/Envs/ets-3/lib/python3.4/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view 
    return view_func(*args, **kwargs) 
    File "/home/mehmet/Envs/ets-3/lib/python3.4/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view 
    return view_func(request, *args, **kwargs) 
    File "/home/mehmet/PycharmProjects/Tango/orders/views.py", line 167, in order_info 
    subscribe_item_list, mount_subscribe_discount_relation) 
    File "/usr/lib/python3.4/contextlib.py", line 30, in inner 
    return func(*args, **kwds) 
    File "/home/mehmet/PycharmProjects/Tango/operations/order.py", line 94, in new_order 
    return encryption(order.id) 
    File "/home/mehmet/PycharmProjects/Tango/operations/order.py", line 15, in encryption 
    new_key = base64.b64encode(str(key)) 
    File "/home/mehmet/Envs/ets-3/lib/python3.4/base64.py", line 62, in b64encode 
    encoded = binascii.b2a_base64(s)[:-1] 
TypeError: 'str' does not support the buffer interface 

Answer 1

在Python 3 base64.b64encode需要bytes對象作爲它的參數，而不是一個str作爲目前的情況。可以通過在key轉換爲字節串的整數處理這個問題，然後Base64編碼的字節串：

>>> key = 123456789 
>>> new_key = base64.b64encode(bytes(str(key), encoding='ascii')) 
>>> print(new_key) 
b'MTIzNDU2Nzg5' 
>>> key = -443322 
>>> new_key = base64.b64encode(bytes(str(key), encoding='ascii')) 
>>> print(new_key) 
b'LTQ0MzMyMg==' 

這裏整數key首先被轉換爲一個Python 3串（類型str），然後轉化成使用ASCII編碼的字節字符串（類型bytes）。任何有效的編碼都可以使用，但ASCII將覆蓋所有可能的數字和一元數字-。

爲了完整起見，在Python 2，你可以只是這樣做：

>>> key = 123456789 
>>> new_key = str(key).encode('base64')