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• How to print the sign + of a digit for positive numbers in Python.

  - by systempuntoout

  Is there a better way to print the + sign of a digit on positive numbers? integer1 = 10 integer2 = 5 sign = '' total = integer1-integer2 if total > 0: sign = '+' print "Total:%s%d" % (sign, total)

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• "With" statement in Python with multiple files to handle.

  - by systempuntoout

  How do i use the with statement in this case? f_spam = open(spam,'r') f_bar = open(eggs,'r') ... do something with these files ... f_spam.close() f_bar.close()

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• How can I compare two lists in python and return matches.

  - by tehryan

  I want to take two lists and find the values that appear in both. a = [1, 2, 3, 4, 5] b = [9, 8, 7, 6, 5] returnMatches(a, b) would return [5], for instance.

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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.

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• 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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• Extracting data from a text file to use in a python script?

  - by Rob

  Basically, I have a file like this: Url/Host: www.example.com Login: user Password: password How can I use RegEx to separate the details to place them into variables? Sorry if this is a terrible question, I can just never grasp RegEx. So another question would be, can you provide the RegEx, but kind of explain what each part of it is for?

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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.

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• Under what circumstances is Python preferrable to PHP for web development, and vice versa? [closed]

  - by z-boss

  There should be reasons other than "it depends"!

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

  - by z-boss

  Frameworks aside.

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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 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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• 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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• 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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• 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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