Do alternate python implementation version numbers imply that they provide the same syntax?
- by mglmnc
for example Jython is at version 2.5.1, does that imply a parallel fidelity to cpython syntax when it was at version 2.5.1?
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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.Read the article
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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?Read the article
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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?Read the article
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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?Read the article
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Building up an array in numpy/scipy by iteration in Python?
- by user248237
Often, I am building an array by iterating through some data, e.g.: my_array = [] for n in range(1000): # do operation, get value my_array.append(value) # cast to array my_array = array(my_array) I find that I have to first build a list and then cast it (using "array") to an array. Is there a way around these? all these casting calls clutter the code... how can I iteratively build up "my_array", with it being an array from the start? thanks.Read the article
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How do I join the values of nested Python dictionary?
- by alex
Suppose I have a dictionary, and it's nested with dictionaries inside. I want to join all the values of that dictionary, recursively? ' '.join(d.values()) That works if there are no nests.Read the article
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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."Read the article
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Still, what is better for web: PHP or Python? [closed]
- by z-boss
Frameworks aside.Read the article
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How can i read bzr repository from python script?
- by zzz
like getting information about changesets/comments etc.Read the article
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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?Read the article
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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".Read the article
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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 FalseRead the article
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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??Read the article
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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.Read the article
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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?Read the article
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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))Read the article
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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, ...)?Read the article
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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())Read the article
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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.Read the article
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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...Read the article
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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()Read the article
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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 controllerRead the article
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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 FalseRead the article
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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?Read the article
