我正在尝试编写一个用于加密安全随机数的Haskell库.代码如下:
module URandom (URandom, initialize) where
import qualified Data.ByteString.Lazy as B
import System.Random
import Data.Word
newtype URandom = URandom [Word8]
instance RandomGen URandom where
next (URandom (x : xs)) = (fromIntegral x, URandom xs)
split (URandom l) = (URandom (evens l), URandom (odds l))
where evens (x : _ : xs) = x : evens xs
odds (_ : x : xs) = x : odds xs
genRange _ = (fromIntegral (minBound :: Word8), fromIntegral (maxBound :: Word8))
initialize :: …我正在尝试编写一个python脚本来发送一个使用HTML格式的电子邮件,并涉及许多不间断的空格.但是,当我运行它时,一些字符串被每171个字符出现的空格打断,这个例子可以看出:
#!/usr/bin/env python
import smtplib
import socket
from email.mime.text import MIMEText
emails = ["my@email.com"]
sender = "test@{0}".format(socket.gethostname())
message = "<html><head></head><body>"
for i in range(20):
message += " " * 50
message += "<br/>"
message += "</body>"
message = MIMEText(message, "html")
message["Subject"] = "Test"
message["From"] = sender
message["To"] = ", ".join(emails)
mailer = smtplib.SMTP("localhost")
mailer.sendmail(sender, emails, message.as_string())
mailer.quit()
该示例应该生成一个仅包含空格的空白电子邮件,但最终看起来像这样:
  ;
&nb sp;
& nbsp;
&nbs p;
&n bsp;
编辑:如果它很重要,我正在运行带有Postfix的Ubuntu 15.04用于smtp客户端,并使用python2.6.
考虑以下代码：
import random
class Trie:
def __init__(self, children, end):
self.children = children
self.end = end
def trie_empty():
return Trie(dict(), False)
def trie_insert(x, t):
if not x:
t.end = True
return
try:
t2 = t.children[x[0]]
except KeyError:
t2 = trie_empty()
t.children[x[0]] = t2
trie_insert(x[1:], t2)
def fill_dict(root):
memo = dict()
def fill(pfx='', depth=0):
try:
memo[pfx]
except KeyError:
pass
else:
return
if depth > 6:
return
for ci in range(ord('a'), ord('d') + 1):
fill(pfx + chr(ci), depth + 1)
bw = None …