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  • Python: if key in dict vs. try/except

    - by LeeMobile
    I have a question about idioms and readability, and there seems to be a clash of Python philosophies for this particular case: I want to build dictionary A from dictionary B. If a specific key does not exist in B, then do nothing and continue on. Which way is better? try: A["blah"] = B["blah"] except KeyError: pass or if "blah" in B: A["blah"] = B["blah"] "Do and ask for forgiveness" vs. "simplicity and explicitness". Which is better and why?

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  • traverse a binary decison tree using python?

    - by kaushik
    how to traverse a binary decision tree using python language. given a tree,i want know how can we travesre from root to required leaf the feature of the required leaf are given in an dictionary form assume and have to traverse from root to leaf answering the questions at each node with the details given in feature list.. the decision tree node has format ((question)(left tree)(right tree)) while traversing it should answer question at each node and an choose left or right and traverse till leaf?

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  • Python + PyQt program freezes

    - by DSblizzard
    I wrote PyQt application. After it's start I close it (GUI), but timer don't stops and Python sometimes freezes. Only thing to unfreeze it - Ctrl-C, after which following message appears: Traceback (most recent call last): File "", line 262, in timerEvent KeyboardInterrupt timer don't stops again, and CPython works very slowly. How to avoid this problem?

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  • Python command line - add PYTHONPATH during module run

    - by orokusaki
    I want to run: python somescript.py somecommand But, when I run this I need PYTHONPATH to include a certain directory. I can't just add it to my environment variables because the directory I want to add changes based on what project I'm running. Is there a way to alter PYTHONPATH while running a script? Note: I don't even have a PYTHONPATH variable, so I don't need to worry about appending to it vs overriding it during running of this script.

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  • Pagination in Google App Engine with Java

    - by newbie
    I need to create simple pagination of objects, but when I read manual I found out that query.setRange(5, 10); will fetch 10 objects, even when only 5 objects are needed. Is there anyway to fetch just needed objects? EDIT: I started bounty, so fi you can show me simple example code in Java that works, then I will accept you answer.

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  • Comparing two text files in python

    - by tazim
    Hi, I need to compare two files and redirect the different lines to third file. I know using diff command i can get the difference . But, is there any way of doing it in python ? Any sample code will be helpful

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  • Python: Run a progess bar and work simultaneously?

    - by DanielTA
    I want to know how to run a progress bar and some other work simultaneously, then when the work is done, stop the progress bar in Python (2.7.x) import sys, time def progress_bar(): while True: for c in ['-','\\','|','/']: sys.stdout.write('\r' + "Working " + c) sys.stdout.flush() time.sleep(0.2) def work(): *doing hard work* How would I be able to do something like: progress_bar() #run in background? work() *stop progress bar* print "\nThe work is done!"

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  • SOAP 1.2 python client

    - by Bluebird75
    Hi, I am looking for a python SOAP 1.2 client but it seems that it does not exist . All of the existing clients are either not maintainted or only compatible with SOAP 1.1: suds SOAPpy ZSI

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  • python interpreter waits for child process to die

    - by Moulik Kallupalam
    Contents of check.py: from multiprocessing import Process import time import sys def slp(): time.sleep(30) f=open("yeah.txt","w") f.close() if __name__=="__main__" : x=Process(target=slp) x.start() sys.exit() In windows 7, from cmd, if I call python check.py, it doesn't immediately exit, but instead waits for 30 seconds. And if I kill cmd, the child dies too- no "yeah.txt" is created. How do I make ensure the child continues to run even if parent is killed and also that the parent doesn't wait for child process to end?

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  • Python style: if statements vs. boolean evaluation

    - by mkscrg
    One of the ideas of Python's design philosophy is "There should be one ... obvious way to do it." (PEP 20), but that can't always be true. I'm specifically referring to (simple) if statements versus boolean evaluation. Consider the following: if words: self.words = words else: self.words = {} versus self.words = words or {} With such a simple situation, which is preferable, stylistically speaking? With more complicated situations one would choose the if statement for readability, right?

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  • How does Python store lists internally?

    - by Mike Cooper
    How are lists in python stored internally? Is it an array? A linked list? Something else? Or does the interpreter guess at the right structure for each instance based on length, etc. If the question is implementation dependent, what about the classic CPython?

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  • Python - How is this snippet working?

    - by orokusaki
    For some reason this function confused me: def protocol(port): return port == "443" and "https://" or "http://" Can somebody explain the order of what's happening behind the scenes to make this work the way it does. I understood it as this until I tried it: Either A) def protocol(port): if port == "443": if bool("https://"): return True elif bool("http://"): return True return False Or B) def protocol(port): if port == "443": return True + "https://" else: return True + "http://" Is this some sort of special case in Python, or am I completely misunderstanding how statements work?

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  • App Engine SDK Console Not Fully Updated on OSX for GAE Release 1.3.4

    - by ryan
    I downloaded and am running the latest SDK (in About GoogleAppleEngineLauncher, I see it is version 1.3.4.794), but when I open the SDK Console and go to the Task Queue section, I still see "Tasks will not run automatically. Select a queue to run tasks manually." I have not added the flag --disable_task_running, so I'm confused as to why it is still manual for me.

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  • Restrictons of Python compared to Ruby: lambda's

    - by Shyam
    Hi, I was going over some pages from WikiVS, that I quote from: because lambdas in Python are restricted to expressions and cannot contain statements I would like to know what would be a good example (or more) where this restriction would be, preferably compared to the Ruby language. Thank you for your answers, comments and feedback!

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  • Finding unique maximum values in a list using python

    - by mikip
    Hi I have a list of points as shown below points=[ [x0,y0,v0], [x1,y1,v1], [x2,y2,v2].......... [xn,yn,vn]] Some of the points have duplicate x,y values. What I want to do is to extract the unique maximum value x,y points For example, if I have points [1,2,5] [1,1,3] [1,2,7] [1,7,3] I would like to obtain the list [1,1,3] [1,2,7] [1,7,3] How can I do this in python Thanks

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  • Need to constantly monitor serial data in Python

    - by jakke34
    Right now I am using an arduino to send data from an analog sensor to COM4. I am trying to make a python script that continuously monitors that data and looks for a certain parameter. I tried something like this but it isn't outputing the data like I want. import serial port = "COM4" ser = serial.Serial(port,9600, timeout =1) value = 0 while 1: value = ser.read() print value

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  • How use AppEngine's Datastore Admin: Copy to Another App Feature

    - by Nick Siderakis
    I recently enabled AppEngine's Datastore Admin. I do not understand the instructions on how to copy my data to another app. Note: The target application must enable remote_api and must include this application’s ID in its HTTP_X_APPENGINE_INBOUND_APPID list. WARNING This application’s data is writable. We can only guarantee a consistent copy when the data being copied is read-only. Note: Blobs (binary data) will not be copied. To enable the remote_api I included the following in the app.yaml: builtins: - remote_api: on I have no idea what HTTP_X_APPENGINE_INBOUND_APPID is, and a Google search yields no results....any ideas?

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