In using a function, I wish to ensure that the type of the variables are as expected. How to do it right? Here is an example fake function trying to do just this before going on with its role: def my_print(begin, text, end): """Print 'text' in UPPER between 'begin' and 'end' in lower """ for i in (begin, text, end): ...
In Python, I'd like to be able to create a function that behaves both as a class function and an instance method, but with the ability to change behaviors. The use case for this is for a set of serializable objects and types. As an example: >>> class Thing(object): #... >>> Thing.to_json() 'A' >>> Thing().to_json() 'B' I know that...
How do I find the full path of the currently running Python interpreter? ...
I need to convert HTML documents into PDF format. Can u help me? ...
I want to define a generator from a list that will output the elements one at a time, then use this generator object in an appropriate manner. a = ["Hello", "world", "!"] b = (x for x in a) c = next(b, None) while c != None: print c, c = next(b, None) Is there anything wrong or improvable with the while approach here? Is ther...
I have been trying to write my first big web app (more than one cgi file) and as I kept moving forward with the rough prototype, paralelly trying to predict more tasks, this is the todo that got accumulated (In no particular order). * Validations and input sanitizations * Object versioning (to avoid edit conflicts. I dont want hard lock...
I have a input file which are all floating point numbers to 4 decimal place. i.e. 13359 0.0000 0.0000 0.0001 0.0001 0.0002` 0.0003 0.0007 ... (the first is the id). My class uses the loadVectorsFromFile method which multiplies it by 10000 and then int() these numbers. On top of that, I also loop through each ...
I wish to make a Histogram in Matplotlib from an input file containing the raw data (.txt). I am facing issues in referring to the input file. I guess it should be a rather small program. Any Matplotlib gurus, any help ? I am not asking for the code, some inputs should put me on the right way ! ...
I recently installed twython, a really sleek and awesome twitter API wrapper for Python. I installed it and it works fine from the interpreter, but when I try to import it via Eclipse, it says that twython is an invalid import. How do I "tell" eclipse where twython is so that it will let me import and use it? ...
Okay, I log onto the MySQL command-line client as root. I then open or otherwise run a python app using the MySQLdb module as root. When I check the results using python (IDLE), everything looks fine. When I use the MySQL command-line client, no INSERT has occurred. If I change things around to _mysql instead of MySQLdb, everything works...
a='1234;5' print a.index('s') thr error is : > "D:\Python25\pythonw.exe" "D:\zjm_code\kml\a.py" Traceback (most recent call last): File "D:\zjm_code\kml\a.py", line 4, in <module> print a.index('s') ValueError: substring not found thanks ...
My app has tables for languages and countries (actually django-countries at the moment, but open for suggestions). The tables are populated when I initialize the database and remain static after that. What would be the ideal localization mechanism for the contents of these tables, so that I can show the country and language names to us...
I am trying to plot the following ! from numpy import * from pylab import * import random for x in range(1,500): y = random.randint(1,25000) print(x,y) plot(x,y) show() However, I keep getting a blank graph (?). Just to make sure that the program logic is correct I added the code print(x,y), just the confirm that (x,...
it`s normally build with python 2.5 BUT i need 2.6! 2.6 normally installed in /opt/python26 and successfully run as python2.6 in console. but python2.6 uwsgiconfig.py --build give me *** uWSGI linking *** /usr/bin/ld: cannot find -lpython2.6 collect2: ld returned 1 exit status HELP! ...
I want to use a generator as the argument passed by a PyQt4 signal, and I am not sure as to the cleanest way. I could just do something like elementChosen=QtCore.pyqtSignal(type((i for i in xrange (i)))), but this just looks ugly. Any suggestions? ...
Hey guys, let's say I have a sorted list of Floats. Now I'd like to get the index of the next lower item of a given value. The usual for-loop aprroach has a complexity of O(n). Since the list is sorted there must be a way to get the index with O(log n). My O(n) approach: index=0 for i,value in enumerate(mylist): if value>compareVa...
I want to create a new column. How do I write this in SQL? class mytable(models.Model): created_at = models.DateTimeField(auto_now_add=True) ...
i have following code that strip all tags. now i want to strip only anchor tags. x = re.compile(r'<[^<]*?/?>') how to modify so that only anchor tags stripped. ...
There is a byte at a specific index in a byte string which represents eight flags; one flag per bit in the byte. If a flag is set, its corresponding bit is 1, otherwise its 0. For example, if I've got b'\x21' the flags would be 0001 0101 # Three flags are set at indexes 0, 2 and 4 # and the others are not set What w...
Hi experts, How can data can be sent to the server? For example, I have retrieve MAC address, so I want send to the server (e.g. http://211.21.24.43:8080/data?mac=00-0C-F1-56-98-AD) I found this snippet on the Internet: from urllib2 import Request, urlopen from binascii import b2a_base64 def b64open(url, postdata): req = Request(...