reddit URL 中的字母数字 ID 是什么? [英] What is the alphanumeric id in a reddit URL?

问题描述

reddit URL中的7n5lu是什么

<块引用>

http://www.reddit.com/r/reddit.com/comments/7n5lu/man_can_fly_if_you_watch_one_video_in_2

...它是如何生成的?

更新:@Gerald，我最初认为这是对 id 的一些混淆.它只是将整数转换为更紧凑的表示.我在想，为什么要这样做?为什么不使用原始整数本身！！

<预><代码>>>>to36(4000)'334'>>>to36(4001)'335'

解决方案

reddit 源代码 可用！这是我在生成该字符串时发现的内容:

def to_base(q,alphabet):如果 q＜0:引发 ValueError，必须提供一个正整数"l = len(字母)转换 = []而 q != 0:q, r = divmod(q, l)转换.插入(0，字母[r])返回 "".join(converted) 或 '0'def to36(q):返回到_base(q，'0123456789abcdefghijklmnopqrstuvwxyz')

和其他地方，在链接"类下:

@propertydef _id36(self):返回到36(self._id)

What is the 7n5lu in the reddit URL

http://www.reddit.com/r/reddit.com/comments/7n5lu/man_can_fly_if_you_watch_one_video_in_2

...and how is it generated?

Update: @Gerald, I initially thought this is some obfuscation of the id. It is just doing the conversion from integer to a more compact representation. I am thinking, why is this being done? why not use the original integer itself!!

>>> to36(4000)
'334'
>>> to36(4001)
'335'

解决方案

The reddit source code is available! Here is what I found for generating that string:

def to_base(q, alphabet):
    if q < 0: raise ValueError, "must supply a positive integer"
    l = len(alphabet)
    converted = []
    while q != 0:
        q, r = divmod(q, l)
        converted.insert(0, alphabet[r])
    return "".join(converted) or '0'

def to36(q):
    return to_base(q, '0123456789abcdefghijklmnopqrstuvwxyz')

and elsewhere, under the "Link" class:

@property
def _id36(self):
    return to36(self._id)

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