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• Python: What's a correct and good way to implement __hash__()?

  - by random-name

  What's a correct and good way to implement hash()? I am talking about the function that returns a hashcode that is then used to insert objects into hashtables aka dictionaries. As hash() returns an integer and is used for "binning" objects into hashtables I assume that the values of the returned integer should be uniformly distributed for common data (to minimize collisions). What's a good practice to get such values? Are collisions a problem? In my case I have a small class which acts as a container class holding some ints, some floats and a string.

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• Could you describe with a five lines max snippet why you felt in love with Python? [closed]

  - by systempuntoout

  I coded in Java for many years and after i saw this beauty: with open("spam.egg") as f: for line in f: print line i said to myself, i can't use Java's StreamVerboseCrapByteOpenBuffer stuff anymore. What's your snippet?

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• How do I send this email in Python, opening files and stuff?

  - by alex

  msg = EmailMessage(subject, body, from_email, [to_email]) msg.content_subtype = "html" msg.send() This is how I send an email in Django. But what if I want to open a text file and take into account all its line breaks and tabs. I want to take the body of the text file (with line breaks \n) and email it as text of the "body".

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• In Python, how to I create a datetime with X hours?

  - by alex

  How do I create the datetime that is 24 hours before NOW()? 48 before NOW()? X hours or days before now??

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• (Python) Why do I always have to type absolute paths in file functions?

  - by Ideka

  For instance, if I have: C:\42\main.py and C:\42\info.txt and I want to read info.txt from main.py, I have to input "C:\42\info.txt" instad of just "info.txt". Is it supposed to be like that? If not, how can I fix it?

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• How can i read bzr repository from python script?

  - by zzz

  like getting information about changesets/comments etc.

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• What is the difference between "a is b" and "id(a) == id(b)" in Python?

  - by bp

  The id() inbuilt function gives... an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime. The is operator, instead, gives... object identity So why is it possible to have two objects that have the same id but return False to an is check? Here is an example: >>> class Test(): ... def test(): ... pass >>> a = Test() >>> b = Test() >>> id(a.test) == id(b.test) True >>> a.test is b.test False A more troubling example: (continuing the above) >>> b = a >>> b is a True >>> b.test is a.test False >>> a.test is a.test False

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• I'm making a resume...what would you consider as intermediate python programming skills?

  - by user285884

  I've made a couple of scripts. One is a stock screener that can search through every stock. Another creates a heatmap that tells you what's performed well and badly over the past day. They aren't really that useful, just did them to work on my programming skills. I was able to throw some SQL in my scripts too. Would you call that intermediate? Thanks? How do you guys list your programming skills on your resume? Maybe there's a better way of putting it on my resume than "intermediate" or "beginner."

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• Is there a way to change lookandfeel for wx Python?

  - by uberjumper

  Hi, i was curious if there is some sort of way to change the look and feel of wxpython to something that is more standardized. I am writing a small application for windows and mac os x. And i noticed that Mac formats the layout and look of my application pretty terribly. I looked around online and could not find anything. Any ideas?

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• How do I sort a list of python Django objects?

  - by alex

  In Django, I have a model object in a list. [object, object, object] Each object has ".name" which is the title of the thing. How do I sort alphabetically by this title? This doesn't work: catlist.sort(key=lambda x.name: x.name.lower())

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• How do I let my console window always on top with Python?

  - by Shady

  How I let the window always on top?

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• Can this statement ever evaluate to FALSE?

  - by BojanG

  I stumbled upon this while doing a review and the author is not available: int n = Convert.ToInt32(text); if (((n > 0) || (n < 0)) || (n == 0)) { return 1; } The code in general looks solid and it's hard for me to believe that the only purpose of this snippet is to confuse reviewers, but I don't see a way for this condition to fail. Am I missing something?

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• lambda vs. operator.attrgetter('xxx') as sort key function in Python

  - by Paul McGuire

  I am looking at some code that has a lot of sort calls using comparison functions, and it seems like it should be using key functions. If you were to change seq.sort(lambda x,y: cmp(x.xxx, y.xxx)), which is preferable: seq.sort(key=operator.attrgetter('xxx')) or: seq.sort(key=lambda a:a.xxx) I would also be interested in comments on the merits of making changes to existing code that works.

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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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• In Django/python, how do I set the memcache to infinite time?

  - by alex

  cache.set(key, value, 9999999) But this is not infinite time...

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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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• Can a PIPE in LINUX ever lose data?

  - by shadyabhi

  And is there a upper limit on how much data can it contain?

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• Still, what is better for web: PHP or Python? [closed]

  - by z-boss

  Frameworks aside.

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• How do I use regex to do this in Python?

  - by alex

  def symbolsReplaceDashes(text): I want to replace all spaces and symbols with hyphens. Because I want to use this with URL.

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• Is there something similar to node-git for python?

  - by flipmoe

  http://github.com/creationix/node-git Reading blog posts from a repository. If not, how would you do it (chaching, ...)?

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• What is (self) in the python code? (OOP question)

  - by alex

  class MyController(BaseController): def index(self): # Return a rendered template #return render('/test.mako') # or, return a response return '' Why does the function "index" have "self"? I got this code from Pylons controller

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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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• 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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• In Python, is there an easy way to edit xml in place ?

  - by sms169

  Suppose I want to edit a node in xml and edit one of its attributes. I want to be able to do a simple file diff to just see one row changed. Dumping the xml using prettyprint changes the whole xml structure.

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• How do I override __getattr__ in Python without breaking the default behavior?

  - by sheats

  I want to override the getattr method on a class to do something fancy but I don't want to break the default behavior. What's the correct way to do this?

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