如何在python中读取/dev/random [英] How to read /dev/random in python

问题描述

我在书中读到 /dev/random 就像一个无限文件，但是当我设置以下代码以查看内容的样子时，它什么也没打印.

I read in a book that /dev/random is like an infinite file, but when I set up the following codes to see what the content look like, it prints nothing.

with open("/dev/random") as f:
    for i in xrange(10):
        print f.readline()

顺便说一句，当我用 /dev/urandom 尝试这个时，它奏效了.

BTW, when I tried this with /dev/urandom, it worked.

推荐答案

它输出的是随机字节，而不是随机行.在获得换行符之前，您什么也看不到，换行符平均每 256 个字节才会发生一次./dev/urandom 似乎有效的原因很简单，因为它运行得更快.等待更长时间，阅读更少，或使用 /dev/urandom.

It is outputting random bytes, not random lines. You see nothing until you get a newline, which will only happen every 256 bytes on average. The reason /dev/urandom appears to work is simply that it operates faster. Wait longer, read less, or use /dev/urandom.

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