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  • Why subtract a value from itself (x - x) in Python?

    - by endolith
    In NumPy functions, there are often initial lines that do checking of variable types, forcing them to be certain types, etc. Can someone explain the point of these lines? What does subtracting a value from itself do? t,w = asarray(t), asarray(duty) w = asarray(w + (t-t)) t = asarray(t + (w-w))

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  • How to assure applying order of function decorators in Python?

    - by Satoru.Logic
    Some decorators should only be used in the outermost layer. A decorator that augments the original function and add a configure parameter is one example. from functools import wraps def special_case(f): @wraps(f) def _(a, b, config_x=False): if config_x: print "Special case here" return return f(a, b) How can I avoid decorators like this getting decorated by another decorator? EDIT It is really disgusting to let everyone trying to apply a new decorator worry about the application order. So, is it possible to avoid this kind of situation? Is it possible to add a config option without introducing a new parameter?

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  • Feedback on implementation of function which compares integer signs in Python.

    - by John Magistr
    Hi all. I've made a small function which, given a tuple, compares if all elements in this tuple is of the same sign. E.g., tuple = [-1, -4, -6, -8] is good, while [-1, -4, 12, -8] is bad. I am not sure I've made the smartest implementation, so I know this is the place to ask. def check_consistent_categories(queryset): try: first_item = queryset[0].amount if first_item < 0: for item in queryset: if item > 0: return False return True else: for item in queryset: if item < 0: return False return True except: return False

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  • How do I do this in Python (File Manipulation)?

    - by ThinkCode
    I have a bunch of HTML files in HTML folder. Those HTML files have unicode characters which I solved by using filter(lambda x: x in string.printable, line). Now how do I write the changes back to the original file? What is the best way of doing it? Each HTML file is of 30 kb in size. 1 import os, string 2 3 for file in os.listdir("HTML/"): 4 print file 5 myfile = open('HTML/' + file) 6 fileList = myfile.readlines() 9 for line in fileList: 10 #print line 11 line = filter(lambda x: x in string.printable, line) 12 myfile.close()

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  • Why is this writing part of the text to a new line? (Python)

    - by whatsherface
    I'm adding some new bits to one of the lines in a text file and then writing it along with the rest of the lines in the file to a new file. Referring to the if statement, I that to be all on the same line: x = 13.55553e9 y = 14.55553e9 z = 15.55553e9 infname = 'afilename' outfname = 'anotherone' oldfile = open(infname) lnum=1 for line in oldfile: if (lnum==18): line = "{0:.2e}".format(x)+' '+line+' '+"{0:.2e}".format(y)+' '+ {0:.2e}".format(z) newfile = open(outfname,'w') newfile.write(line) lnum=lnum+1 oldfile.close() newfile.close() but y and z are being written on the line below the rest of it. What am I missing here?

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  • mysqldb python escaping ? or %s?

    - by asldkncvas
    Dear Everyone, I am currently using mysqldb. What is the correct way to escape strings in mysqldb arguments? Note that E = lambda x: x.encode('utf-8') 1) so my connection is set with charset='utf8'. These are the errors I am getting for these arguments: w1, w2 = u'??', u'??' 1) self.cur.execute("SELECT dist FROM distance WHERE w1=? AND w2=?", (E(w1), E(w2))) ret = self.cur.execute("SELECT dist FROM distance WHERE w1=? AND w2=?", (E(w1), E(w2)) ) File "build/bdist.linux-i686/egg/MySQLdb/cursors.py", line 158, in execute TypeError: not all arguments converted during string formatting 2) self.cur.execute("SELECT dist FROM distance WHERE w1=%s AND w2=%s", (E(w1), E(w2))) This works fine, but when w1 or w2 has \ inside, then the escaping obviously failed. I personally know that %s is not a good method to pass in arguemnts due to injection attacks etc.

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  • Python . How to get rid of '\r' in string?

    - by draconisthe0ry
    I have an excel file that I converted to a text file with a list of numbers. test = 'filelocation.txt' in_file = open(test,'r') for line in in_file: print line 1.026106236 1.660274766 2.686381002 4.346655769 7.033036771 1.137969254 a = [] for line in in_file: a.append(line) print a '1.026106236\r1.660274766\r2.686381002\r4.346655769\r7.033036771\r1.137969254' I wanted to assign each value (in each line) to an individual element in the list. Instead it is creating one element separated by \r . i'm not sure what \r is but why is putting these into the code ? I think I know a way to get rid of the \r from the string but i want to fix the problem from the source

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  • "Meld requires pygtk 2.8.0 or higher."

    - by Lynx
    I got this error after installing Meld on a new Karmic installation: ~$ meld No module named pygtk Meld requires pygtk 2.8.0 or higher. I installed the latest version of python-gtk with aptitude but I'm not sure what version is actually installed. My python version is 2.6. This is weird because I have another machine that runs Karmic and Meld without a problem. Any ideas?

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  • Having problems install py2app 0.5.2

    - by Francis Young
    Hi there, I am a beginner at python so please excuse me for silly comments or rookie mistakes that i make. I was trying to install py2app 0.5.2 and i hit an error: $Best match: altgraph 0.7.1 $Downloading http://pypi.python.org/packages/source/a/altgraph/altgraph-$0.7.1.tar.gz#md5=f65988bf153410a8514bcdad6a3a8ba6 $Processing altgraph-0.7.1.tar.gz $Running altgraph-0.7.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-GGBuKJ/altgraph-$\0.7.1/egg-dist-tmp-NdWVjC $error: doc/changelog.rst: No such file or directory I was wondering what the solution to this problem is?

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  • Openerp wIth Ubuntu 9.04

    - by agbrand
    I had Ubuntu 8.10. I upgrade it to 9.04. I have Openerp5.0 server/client/web. It worked on 8.10 but not with 9.04. Now when I try to launch my server using: ./openerp-server.py I have this error: ERROR: Import xpath module ERROR: Try to install the old python-xml package It seems that this version of openerp doesn't work with python2.6. Can I redirect openerp to use old version of Python?

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  • Is virtualenv suitable for a production server?

    - by gnufs
    I'm planning to set up a Python app (Pyblosxom) on my server and considering to run it in its own virtualenv sandbox with --no-site-packages. I'm hoping that such a setup would be easily portable and maintainable over the years. However, I've only used virtualenv for development environments that recreate a certain server setup locally, and most sources about virtualenv seem to also mention virtualenv for such a use. Is there any drawback to running a Python app from a virtualenv on a live server?

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  • How come Win+R prompt can open Python when it's not in my path?

    - by houbysoft
    When I use the run prompt in Windows XP Professional (Win+R), and type python.exe or python, it works and greets me with the python prompt. However, when I start a cmd window, and then type python.exe or python, it doesn't find it. This is what I expect, as the Python directory (for me, I:\Python31\) is not in my PATH. How come, then, that if I type python.exe in the Win+R prompt, it works? Edit: here is a partial output of SET, I removed most irrelevant entries, I'm not sure why is it useful, apart from the PATH variable which I already said doesn't include the Python directory. If you need a particular variable other than these, please ask. CLIENTNAME=Console CommonProgramFiles=I:\Program Files\Common Files ComSpec=I:\WINDOWS\system32\cmd.exe FP_NO_HOST_CHECK=NO OS=Windows_NT Path=I:\WINDOWS\system32;I:\WINDOWS;I:\WINDOWS\system32\WBEM;I:\WINDOWS\system32\WindowsPowerShell\v1.0;I:\Qt\2010.05\mingw\bin;I:\Program Files\CMake 2.8\bin PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.PSC1 ProgramFiles=I:\Program Files PROMPT=$P$G SESSIONNAME=Console SystemDrive=I: SystemRoot=I:\WINDOWS VBOX_INSTALL_PATH=I:\Program Files\Oracle\VirtualBox\ windir=I:\WINDOWS

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  • How do I reset my PYTHONPATH?

    - by Underyx
    Somehow my PYTHONPATH environment variable got emptied, and now I can't import some downloaded modules. I've tried running the following command to reinstall all Python packages, but it didn't set the variable back to its original value: dpkg-query -W -f '${package}\n' | grep python | xargs -I % sudo apt-get install % --reinstall How do I reinstall the packages so that this gets sorted out? The (Vagrant) box is running Ubuntu 12.04.

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  • for x in y, type iteration in python. Can I find out what iteration I'm currently on?

    - by foo
    Hi, I have a question about the loop construct in Python in the form of: for x in y: In my case y is a line read from a file and x is separate characters. I would like to put a space after every pair of characters in the output, like this: aa bb cc dd etc. So, I would like to know the current iteration. Is it possible, or do I need to use a more traditional C style for loop with an index?

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