Difference between Python Generators vs Iterators
What is the difference between iterators and generators? Some examples for when you would use each case would be helpful. ...
python
Migrating from SQLAlchemy to MongoDB in Pylons
Is there a migration guide for the the models aspect in pylons, syntax with SQLAlchemy to MongoDB? ...
Difference between Python urllib.urlretrieve() and wget
I am trying to retrieve a 500mb file using Python, and I have a script which uses urllib.urlretrieve(). There seems to some network problem between me and the download site, as this call consistently hangs and fails to complete. However, using wget to retrieve the file tends to work without problems. What is the difference between urlret...
Tabulated log file format with the python logging system
Hi everybody, I'm using the python logging module with the "native" configuration file support (config.fileconfig) as describe in the documentation here : http://docs.python.org/library/logging.html (see the logging.conf file) I was wondering if it's possible to supply a tabulated data format in the configuration file? The sample c...
Making a python iterator go backwards?
Is there anyway to make a python list iterator to go backwards? Basically i have this class IterTest(object): def __init__(self, data): self.data = data self.__iter = None def all(self): self.__iter = iter(self.data) for each in self.__iter: mtd = getattr(self, type(each).__name__) ...
Python operators returning ints
Is there any way to have Python operators line "==" and ">" return ints instead of bools. I know that I could use the int function (int(1 == 1)) or add 0 ((1 == 1) + 0) but I was wondering if there was an easy way to do it. Like when you want division to return floats you could type from __future__ import division. Is there any way to do...
python httplib and broken tcp connection
How do I find out if a connection has been broken using the httplib library? Seems like something so basic yet I can't find the answer on here or google. ...
MongoDB lists with paginations?
for documents with lists with pagination, is it better to embed or use reference? im reading the custom type "SONManipulator" and it appears to transform every thing on retrieval, even the sub docs. i want to keep the list in the document sorted, should this impact anything? ...
Content-Length header not returned from Pylons response
I'm still struggling to Stream a file to the HTTP response in Pylons. In addition to the original problem, I'm finding that I cannot return the Content-Length header, so that for large files the client cannot estimate how long the download will take. I've tried response.content_length = 12345 and I've tried response.headers['Content-...
Howto ignore specific undefined variables in Pydev Eclipse
I'm writing a crossplatform python script on windows using Eclipse with the Pydev plugin. The script makes use of the os.symlink() and os.readlink() methods if the current platform isn't NT. Since the os.symlink() and os.readlink() methods aren't available on the Windows platform Pydev flags them as undefined variables--like so: Qu...
Shutting Down SSH Tunnel in Paramiko Programatically
We are attempting to use the paramiko module for creating SSH tunnels on demand to arbitrary servers for purposes of querying remote databases. We attempted to use the forward.py demo that ships with paramiko but the big limitation is there does not seem to be an easy way to close an SSH tunnel and the SSH connection once the socket ser...
python numpy roll with padding
I'd like to roll a 2D numpy in python, except that I'd like pad the ends with zeros rather than roll the data as if its periodic. Specifically, the following code import numpy as np x = np.array([[1, 2, 3],[4, 5, 6]]) np.roll(x,1,axis=1) returns array([[3, 1, 2],[6, 4, 5]]) but what I would prefer is array([[0, 1, 2], [0, 4, 5]...
Embed FCKeditor in python app
I have a python application which need a gui HTML editor, I know FCKeditor is nice, so how to embed the FCKeditor in a python desktop app? ...
Difference between URLLIB2 call in IDLE and from Django?
The following piece of code works as expected when running in a local install of django apache 2.2 fx = urllib2.Request(f); fx.add_header('User-Agent','Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/1.0.154.36 Safari/525.19'); url_opened = urllib2.urlopen(fx); However when I enter that...
Python script run via cron does not execute occassionally
I have a simple python script for fetching tweets and caching them to disk that is configured to run every two minutes via cron. */2 * * * * (date ; /usr/bin/python /path/get_tweets.py) >> /path/log/get_tweets.log 2>&1 The script runs successfully most of the time. However, every so often the script doesn't execute. In addition to...
Python TypeError: an integer is required
import scipy,array def try_read_file(): def line_reader(lines): for l in lines: i = l.find('#') if i != -1: l = l[:i] l = l.strip() if l: yield l def column_counter(): inputer = (line.split() for line in line_reader(file('/home/kartik/Downloads/yahoo_dataset/set1...
Convert a sequence of sequences to a dictionary and vice-versa
One way to manually persist a dictionary to a database is to flatten it into a sequence of sequences and pass the sequence as an argument to cursor.executemany(). The opposite is also useful, i.e. reading rows from a database and turning them into dictionaries for later use. What's the best way to go from myseq to mydict and from mydic...
Increment number in string
Hi, I am stumped... I am trying to get the following output until a certain condition is met. test_1.jpg test_2.jpg .. test_50.jpg The solution (if you could remotely call it that) that I have is fileCount = 0 while (os.path.exists(dstPath)): fileCount += 1 parts = os.path.splitext(dstPath) dstPath = "%s_%d%s" % (parts[0], ...
How can I find "week" in django's calendar app?
MyCalendar.py Code: from django import template imort calendar import datetime date = datetime.date.today() week = ??? ... The question is that I want to get the week which contains today's date. How can I do? Thanks for help! Ver: Django-1.0 Python-2.6.4 ...
Python faster way to read fixed length fields form a file into dictionary
I have a file of names and addresses as follows (example line) OSCAR ,CANNONS ,8 ,STIEGLITZ CIRCUIT And I want to read it into a dictionary of name and value. Here self.field_list is a list of the name, length and start point of the fixed fields in the file. What ways are there to speed up this method? (python 2.6) de...