google app engine python - Page 520

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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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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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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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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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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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 JVM language + web framework do you use with Google Appengine Java?

- by Langali

Looking for the least bumpy (and most productive ) ride for a web 2.0 idea... Groovy/Grails, Scala/Lift, Groovy/Gaelyk, OR.... Please share your experience.

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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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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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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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Java ORM related question - SQL Vs Google DB (Big Table?) GAE

- by StackerFlow

I was wondering about the following two options when one is not using SQL tables but ORM based DBs (Example - when you are using GAE) Would the second option be less efficient? Requirement: There is an object. The object has a collection of similar items. I need to store this object. Example, say the object is a tree and it has a collection of leaves. Option 1: Traditional SQL type structure: Table for the Tree (with TreeId as the identifier for a row in the Table.) Table for the Leaves (where each leaf has a TreeId and to show the leaves of a tree, I query all leaves where the TreeId is the Id of the tree.) Here, the Tree structure DOES NOT have a field with leaves. Option 2: ORM / GAE Tables: Using the same example above, I have an object for Tree where the object has a collection (Set/List in Java/C++) of leaves. I store and retrieve the Tree together with the leaves (as the leaves are implemented as a Set in the Tree object) My question is, will the second one be less efficient that the first option? If so, why? Are there other alternatives? Thank you!

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

- by z-boss

Frameworks aside.

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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?