jfriedly

import socket
import threading

""" Create a thread listening for client connections and enter the GUI mainloop
"""
def main():
  server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  server_socket.bind((socket.gethostname(), 80))
  server_socket.listen(5)
  client_sockets = []

jfriedly

ENVIRONMENT VARIABLES
       The following environment variables could affect ps:

       COLUMNS
          Override default display width.

       LINES
          Override default display height.

       PS_PERSONALITY

jfriedly

#! /usr/bin/python

import time


x = 0
last = time.time()

jfriedly

greater_42 = (num for num in mylist if num > 42)
square = (num ** 2 for num in greater_42)
retval = 0
for num in square:
    retval = 3 * retval + num

vs.

jfriedly

C: putc vs fputc

From the putc man page, "putc() is equivalent to fputc() except that it may be implemented as a macro which evaluates stream more than once." I wasn't sure what this meant so I asked Shevek. He launched into a lambda calculus explanation that eventually boiled down to: putc may evaluate it's arguments more than once, but fputc evaluates them exactly once. This is because putc is implemented as a macro and the C preprocessor just does string substitution, leading to examples like the ones below.

Ignoring what putc and fputc actually do, let's look at a simplified version where they both simply do one operation twice and another operation once:

jfriedly

$ ./test-driver.py 
[******************************] 1000/1000 100% [00:10, 00:00, 98.88 #/s]
Traceback (most recent call last):
  File "./test-driver.py", line 29, in <module>
    for _ in tqdm(range(1000), leave=True, format_dict=format_dict1):
TypeError: tqdm() got an unexpected keyword argument 'format_dict'

jfriedly

import itertools


class Player()
    _count = itertools.count()

    def __init__(self):
        self.id = _count.next()
        # ...

jfriedly

# Comments!
PROGRAM joel IS

VARIABLE movecounter = 4

INSTRUCTION default IS
    IF next-is-not-friend THEN
        infect
    END IF
    WHILE next-is-empty DO

jfriedly

17:04:49 D, [2013-08-08T17:04:48.397029 #22915] DEBUG -- : error in setup command: Error parsing /tmp/buildd/python-cinderclient-1.0.5/setup.cfg: Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository.
17:04:49 D, [2013-08-08T17:04:48.418053 #22915] DEBUG -- : dh_auto_clean: python setup.py clean -a returned exit code 1
17:04:49 D, [2013-08-08T17:04:48.419824 #22915] DEBUG -- : make: *** [clean] Error 1

jfriedly

>>> for index, letter in enumerate('foobar'):
...     print index, letter
...
0 f
1 o
2 o
3 b
4 a