Comments for Evan Fosmark

Comment on Python WSGI Middleware for automatic Gzipping by Sergey

Sergey — Sun, 28 Dec 2008 00:14:06 +0000

In the first for loop, you could do

encoding, sep, qvalue = encoding.partition(';')
qvalue = qvalue.partition('=')[2]
qvalue = 1 if not qvalue else float(qvalue)
encodings[encoding] = qvalue

The advantage here is that the code is linear. The disadvantage is that a later Python version is required.

Comment on Python WSGI Middleware for automatic Gzipping by Evan

Evan — Fri, 26 Dec 2008 08:16:10 +0000

Jim, thank you for your input. I have updated the code accordingly.

Comment on Python WSGI Middleware for automatic Gzipping by Jim

Jim — Fri, 26 Dec 2008 01:18:53 +0000

Two bugs:

> if(environ.get("HTTP_ACCEPT_ENCODING", "").find("gzip") < 0)

This fails for cases like Accept-Encoding: identity, compress;q=0.5, gzip;q=0

You need to actually split up the header value properly in order to handle it correctly, a simple search fails for corner cases.

You also need to transmit a Vary header.

Comment on Python WSGI Middleware for automatic Gzipping by Evan

Evan — Thu, 25 Dec 2008 23:45:43 +0000

Heh, yeah I guess you're right. It just looks messy to me. :-P

Comment on Python WSGI Middleware for automatic Gzipping by japherwocky

japherwocky — Thu, 25 Dec 2008 22:28:57 +0000

I think that's exactly the proper usage of StringIO. Not a hack at all. :)

Comment on XOR Encryption With Python by Dan

Dan — Wed, 24 Dec 2008 20:39:19 +0000

The one-time pad is the only cipher known to be 100% secure, because there is no way to determine that any given key is correct. The problem with trying to cryptanalyze (break) such a cipher as this is that you can never be sure that you actually have the correct key. Like you said, though, this cipher requires a key with the same length as the plaintext (unencrypted text) that is never reused and has perfect randomness. The funny thing about randomness is this: There's no good test for it!

Consider this sequence of numbers: 1, 1, 1, 1, 1, 1

That sequence looks very non-random, but it's impossible to tell if that was generated by repeating the number 1, by picking numbers randomly from a hat or from one's mind, by choosing from a limited set of numbers using a poor random number generator, by choosing from an infinite set of numbers using a perfect random number generator…

And of course, how do you transmit the keys safely? ;)

Comment on XOR Encryption With Python by Jordan

Jordan — Sun, 07 Dec 2008 03:08:53 +0000

Here is a function written in python using xor encryption. The file target is a file path (i.e., /root/myfile.txt) and the key can be one of two things: a simple text password ("mypassword") or a path to a file to be used as a key("/root/myKey.key"). I do not have izip, so I commented out the list comprehension you gave on this site.

def xor(fileTarget, key):
	fileTarget = fileTarget + os.listdir(fileTarget)[0]
 
	ifile = os.path.split(fileTarget)[0]+"/xor.in"
	ofile = os.path.split(fileTarget)[0]+"/xor.out"
	os.rename(fileTarget, ifile)
 
	if os.path.isfile(key):
		kf = open(key)
		keyData = kf.read()
		kf.close()
	else:
		keyData = key
 
	e = open(ofile, "w")
	f = open(ifile, "r")
 
	bytesToCopy = os.stat(os.path.split(fileTarget)[0]+"/xor.in")[6]
 
	while bytesToCopy:
 
		if bytesToCopy &gt;= len(keyData):
			data = f.read(len(keyData))
			bytesToCopy -= len(keyData)
			encryptedData = ''.join([chr(ord(data[i])^ord(keyData[i])) for i in xrange(len(data))])
			# encryptedData = ''.join(chr(ord(x) ^ ord(y)) for (x,y) in izip(data, cycle(key)))
			e.write(encryptedData)
 
		else:
			data = f.read(bytesToCopy)
			bytesToCopy = 0
			encryptedData = ''.join([chr(ord(data[i])^ord(keyData[i])) for i in xrange(len(data))])
			# encryptedData = ''.join(chr(ord(x) ^ ord(y)) for (x,y) in izip(data, cycle(key)))
			e.write(encryptedData)
	os.remove(ifile)
 
	e.close()
	f.close()
 
	return os.path.split(fileTarget)[0]+"/xor.out"

Comment on About by Bacon Should Not Be Worshiped | Bacon Today

Bacon Should Not Be Worshiped | Bacon Today — Sat, 22 Nov 2008 08:04:08 +0000

[...] via: Evan Fosmark [...]

Comment on Ternary Operator in Python - People got Clever by Alysse

Alysse — Thu, 23 Oct 2008 23:50:55 +0000

I LOVE YOU, EVIE!!

Comment on I Before E, Except After C - Not a rule, but a joke by Alysse

Alysse — Fri, 18 Jul 2008 05:31:04 +0000

This is brilliant! I love it!