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python Programming Glossary: falseWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python print hasattr ObjectCreator 'new_attribute' False ObjectCreator.new_attribute 'foo' # you can add attributes to.. 'FooChild' Foo 'echo_bar' echo_bar hasattr Foo 'echo_bar' False hasattr FooChild 'echo_bar' True my_foo FooChild my_foo.echo_bar.. object children bar 'bip' print hasattr Foo 'bar' # Out False print hasattr Foo 'BAR' # Out True f Foo print f.BAR # Out 'bip'..
Fastest way to list all primes below N in python http://stackoverflow.com/questions/2068372/fastest-way-to-list-all-primes-below-n-in-python sum of all numbers below 2 million 529 in get_primes 1000 False 529 in get_primes 530 True EDIT The rank so far pure python.. n for i in xrange 3 int n 0.5 1 2 if sieve i sieve i i 2 i False n i i 1 2 i 1 return 2 i for i in xrange 3 n 2 if sieve i def.. for i in xrange 3 int n 0.5 1 2 if sieve i 2 sieve i i 2 i False n i i 1 2 i 1 return 2 2 i 1 for i in xrange 1 n 2 if sieve..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained class Bank # let's create a bank building ATMs ... crisis False ... def create_atm self ... while not self.crisis ... yield.. type 'exceptions.StopIteration' hsbc.crisis False # trouble is even post crisis the ATM remains empty print corner_street_atm.next..
Python “is” operator behaves unexpectedly with integers http://stackoverflow.com/questions/306313/python-is-operator-behaves-unexpectedly-with-integers is b True # this is an expected result a 257 b 257 a is b False # what happened here why is this False 257 is 257 True # yet.. a 257 b 257 a is b False # what happened here why is this False 257 is 257 True # yet the literal numbers compare properly I..
http://stackoverflow.com/questions/1035340/reading-binary-file-in-python equal and take advantage of the fact that b evaluates to false. This makes the code compatible between 2.6 and 3.x without..
http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah boolean expressions for details on what Python considers false in a boolean context . So for the values x 2 y 1 z 0 x or y..
why does python's list.append evaluate to false? http://stackoverflow.com/questions/1682567/why-does-pythons-list-append-evaluate-to-false does python's list.append evaluate to false Is there a reason being list.append evaluating to false Or.. false Is there a reason being list.append evaluating to false Or is it just the C convention of returning 0 when successful..
How do I fix PyDev “Undefined variable from import” errors? http://stackoverflow.com/questions/2112715/how-do-i-fix-pydev-undefined-variable-from-import-errors project using PyDev in Eclipse and PyDev keeps generating false errors for my code. I have a module settings that defines a..
Creating a JSON response using Django and Python http://stackoverflow.com/questions/2428092/creating-a-json-response-using-django-and-python success else for x 0 x 1000000 x if x 990000 arrayToJs 2 false echo ' jsonValidateReturn '.json_encode arrayToJs .' ' RETURNS..
Is it Pythonic to use bools as ints? http://stackoverflow.com/questions/3174392/is-it-pythonic-to-use-bools-as-ints your code is perfectly fine. Historically logical true false operations tended to simply use 0 for false and 1 for true in.. logical true false operations tended to simply use 0 for false and 1 for true in the course of Python 2.2's life cycle Guido.. that too many modules started with assignments such as false 0 true 1 and this produced boilerplate and useless variation..
How to implement a minimal server for AJAX in Python? http://stackoverflow.com/questions/336866/how-to-implement-a-minimal-server-for-ajax-in-python function xml_http_post url data callback var req false try Firefox Opera 8.0 Safari req new XMLHttpRequest catch e.. catch e alert Your browser does not support AJAX return false req.open POST url true req.onreadystatechange function if..
How to reliably guess the encoding between MacRoman, CP1252, Latin1, UTF-8, and ASCII http://stackoverflow.com/questions/4198804/how-to-reliably-guess-the-encoding-between-macroman-cp1252-latin1-utf-8-and assume it is UTF 8. Due to UTF 8's strict validation rules false positives are extremely rare. ISO 8859 1 vs. windows 1252 The..
Stripping non printable characters from a string in python http://stackoverflow.com/questions/92438/stripping-non-printable-characters-from-a-string-in-python them out of the output. curses.ascii.isprint will return false for any unicode character. python string non printable share..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python tl dr version include the statement cin.sync_with_stdio false or just use fgets instead. C code #include iostream #include.. Edit 4 was Final Edit Solution Adding cin.sync_with_stdio false Immediately above my original while loop above results in code.. you should see much better performance cin.sync_with_stdio false Normally when an input stream is buffered instead of reading..
Simple Digit Recognition OCR in OpenCV-Python http://stackoverflow.com/questions/9413216/simple-digit-recognition-ocr-in-opencv-python constraints on area and height of letters to avoid false detections . c Draws the bounding rectangle around one letter..
IOError when trying to open existing files http://stackoverflow.com/questions/10802418/ioerror-when-trying-to-open-existing-files correct I tried os.pathisfile location and it comes back FALSE. I am not quite sure what to make of that since when I try for..
Why does Python say this Netscape cookie file isn't valid? http://stackoverflow.com/questions/11529428/why-does-python-say-this-netscape-cookie-file-isnt-valid by libcurl Edit at your own risk. .scholar.google.com TRUE FALSE 2147483647 GSP ID 353e8f974d766dcd CF 2 .google.com TRUE FALSE.. 2147483647 GSP ID 353e8f974d766dcd CF 2 .google.com TRUE FALSE 1317124758 PREF ID 353e8f974d766dcd TM 1254052758 LM 1254052758.. 1254052758 S _biVh02e4scrJT1H .scholar.google.co.uk TRUE FALSE 2147483647 GSP ID f3f18b3b5a7c2647 CF 2 .google.co.uk TRUE FALSE..
http://stackoverflow.com/questions/11957925/psycopg2-mapping-python-list-of-dicts-to-postgres-array-of-composite-type rock' ARRAY ROW 'I AGREE' True quotes ROW 'I DISAGREE' FALSE quotes What is the syntax to achieve this without loops and..
Unix: Getting Mouse -coordinates over X like the Mathematica? http://stackoverflow.com/questions/12078575/unix-getting-mouse-coordinates-over-x-like-the-mathematica what you describe dynmodfunc function plot 0 1 0 1 ann FALSE type 'n' mypoints matrix ncol 2 nrow 0 while length p locator.. rbind mypoints unlist p plot mypoints col 'red' ann FALSE xlim 0 1 ylim 0 1 if nrow mypoints 1 xspline mypoints shape..
http://stackoverflow.com/questions/2953462/pinging-servers-in-python through ICMP and return TRUE if the server responds or FALSE if there is no response python python 3.x ping icmp share..
Connect GIMP with PHP or Python http://stackoverflow.com/questions/3237252/connect-gimp-with-php-or-python fu bw film RUN NONINTERACTIVE path to filename.jpg 0 1 FALSE FALSE FALSE FALSE FALSE FALSE ' b ' gimp quit 0 ' It's not exactly.. bw film RUN NONINTERACTIVE path to filename.jpg 0 1 FALSE FALSE FALSE FALSE FALSE FALSE ' b ' gimp quit 0 ' It's not exactly.. RUN NONINTERACTIVE path to filename.jpg 0 1 FALSE FALSE FALSE FALSE FALSE FALSE ' b ' gimp quit 0 ' It's not exactly pretty..
Playing RTSP with python-gstreamer http://stackoverflow.com/questions/4192871/playing-rtsp-with-python-gstreamer GStreamer gst_init argc argv loop g_main_loop_new NULL FALSE gst launch 0.10 rtspsrc location rtsp ip decodebin ffmpegcolorspace..
Use binary COPY table FROM with psycopg2 http://stackoverflow.com/questions/8144002/use-binary-copy-table-from-with-psycopg2 s1 real s2 real s3 real s4 real s5 real s6 real WITH OIDS FALSE and another similar table named num_data_text . Here are some..
Using a struct as a function argument with the python ctypes module http://stackoverflow.com/questions/8744246/using-a-struct-as-a-function-argument-with-the-python-ctypes-module c_void_p LPSECURITY_ATTRIBUTES c_void_p NULL 0 FALSE BOOL 0 TRUE BOOL 1 def CreateFile filename access sharemode.. LPWSTR fpath LPSECURITY_ATTRIBUTES NULL FALSE def RemoveDirectory fpath return windll.kernel32.RemoveDirectoryW.. fpath return windll.kernel32.RemoveDirectoryW LPWSTR fpath FALSE def translate_path fpath fpath path.abspath fpath if fpath len..
Why are pandas merges in python faster than data.table merges in R? http://stackoverflow.com/questions/8991709/why-are-pandas-merges-in-python-faster-than-data-table-merges-in-r joins in data.table without resorting to merge X Y all FALSE and merge X Y all TRUE Here's the R code and the Python code..
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