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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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• 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 + 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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• exec: 23: python: not found error?

  - by user364133

  im trying to build android from source on ubuntu 10.04. when i enter the repo command: repo init -u git://android.git.kernel.org/platform/manifest.git -b eclair it get this error back exec: 23: python: not found any ideas.

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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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• 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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• Automatically execute commands on launching python shell.

  - by thepandaatemyface

  Hi, I was wondering if there is a way to automatically run commands on entering the python shell as you would with the .bash_profile or .profile scripts with bash. I would like to automatically import some modules so I don't have to type the whole shebang everytime I hop into the shell. Thanks,

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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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• case sensitive string replacement in Python

  - by prosseek

  I need to replace a string in case sensitive way. For example abc - def Abc - Def aBc - dEf abC - deF What can I do this with Python?

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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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• 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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• 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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• Python regular expressions with more than 100 groups?

  - by Evan Fosmark

  Is there any way to beat the 100-group limit for regular expressions in Python? Also, could someone explain why there is a limit. Thanks.

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• Python initialization and circular reference counts

  - by eric

  Can we initialize python objects with statement like this: a = b = c = None it seems to me when I did a = b = c = list() will cause circular reference count issue. Please give your expert advice.

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• Python-mode import problem

  - by smith

  I'm trying to use Emacs as a python editor and it works fine when I evaluate(C-c C-c) only single files but when I evaluate a file that imports another file in the same directory, I get an error saying that the file could not be imported. Does anyone know of a workaround? Thanks in advance

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• Python veIrsion 2.6 required, which was not found in the registry

  - by user74283

  Cant download any pyhton windows modules and install. I wanted to experiment with scrapy framework and stackless but unable to install due to error "Python veIrsion 2.6 required, which was not found in the registry". Trying to install it to Windows 7, 64 bit machine

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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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• Generating very large XML files in Python?

  - by Kenneth Reitz

  Does anyone know of a memory efficient way to generate very large xml files (e.g. 100-500 MiB) in Python? I've been utilizing lxml, but memory usage is through the roof.

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• Share headers amongst files in python?

  - by Timmy

  Is there a way to share headers in python? i import the same things in different controllers in pylons.

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• doing arithmetic upto two significant figures in Python?

  - by user248237

  I have two floats in Python that I'd like to subtract, i.e. v1 = float(value1) v2 = float(value2) diff = v1 - v2 I want "diff" to be computed upto two significant figures, that is compute it using %.2f of v1 and %.2f of v2. How can I do this? I know how to print v1 and v2 up to two decimals, but not how to do arithmetic like that. 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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• Convert python script to binary executable

  - by Werner

  Hi, I wrote a number crunching python code. The calculations involved can take hours. Is it possible somehow to compile it to binary? Thanks

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• Cross platform /dev/null in Python

  - by Tristan

  I'm using the following code to hide stderr on Linux/OSX for a Python library I do not control that writes to stderr by default: f = open("/dev/null","w") zookeeper.set_log_stream(f) Is there an easy cross platform alternative to /dev/null? Ideally it would not consume memory since this is a long running process.

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• How to create temporary files in memory visible for other process, using python

  - by LazyMiha

  Hello! I`m trying to write simple batch file generator in python. Batch file consist of about 30-50 lines of text and is passed to other applications. During the execution of script there a lot of calls to external applications. I want to create file in memory (like named pipes in win32). Is there any platform independ way? p.s. sorry for possible mistakes in text, I'm still learning English

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• Built in python hash() function

  - by sm1

  Windows XP, Python 2.5: hash('http://stackoverflow.com') Result: 1934711907 Google App Engine (http://shell.appspot.com/): hash('http://stackoverflow.com') Result: -5768830964305142685 Why is that? How can I have a hash function which will give me same results across different platforms (Windows, Linux, Mac)?

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