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• Python bitoperators

  - by Neelima

  What do the bit operators like AND(&),OR(|),XOR(^) in python do behind the screen? What do they calculate? I cannot understand the results they give when used in a program? 30&45 yields 12. How can we relate these three? 30|45 yields 63. How are these three related? Please answer this...

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• Worst aspect of Python for a newbie

  - by schickb

  I'm wondering specifically what experienced programmers thought when they started developing in Python. I'm sure the answer depends on your background, but my own personal answer is the conversion of basically anything in the language to a True/False value in boolean contexts. Resulting in "oddities" like: if x: not meaning the same thing as: if x == True: I understand why, but it bugs me, and I certainly had to think about it a bit when I first ran into it.

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• Scientific Plotting in Python

  - by user100046

  I have a large data set of tuples containing (time of event, latitude, longitude) that I need to visualize. I was hoping to generate a 'movie'-like xy-plot, but was wondering if anyone has a better idea or if there is an easy way to do this in Python? Thanks in advance for the help, --Leo

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• Python to extract data from a file

  - by user297003

  Hi, I am new to python. I am trying to extract the text between that has specific text file: ---- data1 data1 data1 extractme ---- data2 data2 data2 ---- data3 data3 extractme ---- and then dump it to text file so that ---- data1 data1 data1 extractme --- data3 data3 extractme --- Thanks for the help.

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• How to share a dictionary between multiple processes in python without locking

  - by RandomVector

  I need to share a huge dictionary (around 1 gb in size) between multiple processs, however since all processes will always read from it. I dont need locking. Is there any way to share a dictionary without locking? The multiprocessing module in python provides an Array class which allows sharing without locking by setting lock=false however There is no such option for Dictionary provided by manager in multiprocessing module.

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• python-like Java IO library?

  - by drozzy

  Java is not my main programming language so I might be asking the obvious. But is there a simple file-handling library in Java, like in python? For example I just want to say: File f = Open('file.txt', 'w') for(String line:f){ //do something with the line from file } Thanks!

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• Python: read streaming input from subprocess.communicate()

  - by Heinrich Schmetterling

  I'm using Python's subprocess.communicate() to read stdout from a process that runs for about a minute. How can I print out each line of that process's stdout in a streaming fashion, so that I can see the output as it's generated, but still block on the process terminating before continuing? subprocess.communicate() appears to give all the output at once.

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• How to reload python module from itself?

  - by mivulf

  I have a python module with a lot of variables. These variables are used and changed by many other modules. And I want to reload this module from itself when it happens (for refresh). How to do that? # ================================== # foo.py spam = 100 def set_spam(value): spam = value foo = reload(foo) # reload module from itself # ================================== # bar.py import foo print foo.spam # I expect 100 # assume that value changes here from some another modules (for example, from eggs.py, apple.py and fruit.py) foo.set_spam(200) print foo.spam # I expect 200

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• Python syntax error: can't assign to operator in module but works in interpreter

  - by mzee

  I have a string a and I would like to split it in half depending on its length, so I have a-front = len(a) / 2 + len(a) % 2 this works fine in the interpreter but when i run the module from the command line python gives me a SyntaxError: can't assign to operator. What could be the issue here.

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• Python templates for huge HTML/XML

  - by newtover

  Hello, Recently I needed to generate a huge HTML page containing a report with several thousand row table. And, obviously, I did not want to build the whole HTML (or the underlying tree) in memory. As result, I built the page with the old good string interpolation, but I do not like the solution. Thus, I wonder whether there are Python templating engines that can yield resulting page content by parts.

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• Counting the number of messages in an e-mail account with python

  - by terabytest

  Hi, is there any way, in Python, to have access to an e-mail account (I'll need this for gmail but better if any works) and be able to see the number of messages in the inbox (maybe even unread messages only)? Thank you.

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• is a there md5 decrypt function in python ?

  - by mekasperasky

  i used md5.new() ; md5.update("aaa"),md5.digest() to form a md5 hash of the data "aaa" . How to get back the data using python?

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• Python for loop question

  - by Joe Dunk

  I was wondering how to achieve the following in python: for( int i = 0; cond...; i++) if cond... i++; //to skip an run-through I tried this with no luck. for i in range(whatever): if cond... : i += 1

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• Output alternatives in Python

  - by Jasper

  Hi I'm a beginner programmer, pretty new 2 it Basically is there any alternatives to the print statement for output in Python, and how can I format my output text to be color-coded? Thanks

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• Is there YAPE::Regex::Explain alternative to python?

  - by S.Mark

  Is there perl's YAPE::Regex::Explain alternative to python? Which could do \w+=\d+|\w+='[^']+' to explanations like this NODE EXPLANATION -------------------------------------------------------------------------------- \w+ word characters (a-z, A-Z, 0-9, _) (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- \d+ digits (0-9) (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- | OR -------------------------------------------------------------------------------- \w+ word characters (a-z, A-Z, 0-9, _) (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- =' '=\'' -------------------------------------------------------------------------------- [^']+ any character except: ''' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ' '\''

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• reading and extracting data from file using python

  - by parijat24

  hello , i am new to python , and I want to extract the data from this format FBpp0143497 5 151 5 157 PF00339.22 Arrestin_N Domain 1 135 149 83.4 1.1e-23 1 CL0135 FBpp0143497 183 323 183 324 PF02752.15 Arrestin_C Domain 1 137 138 58.5 6e-16 1 CL0135 FBpp0131987 60 280 51 280 PF00089.19 Trypsin Domain 14 219 219 127.7 3.7e-37 1 CL0124 to this format FBpp0143497 5 151 Arrestin_N 1.1e-23 FBpp0143497 183 323 Arrestin_C 6e-16

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• Running a python script for a user-specified amount of time?

  - by Rob

  Sorry, this is probably a terrible question. I've JUST started learning python today. I've been reading a Byte of Python. Right now I have a project for Python that involves time. I can't find anything relating to time in Byte of Python, so I'll ask you: How can I run a block for a user specified amount of time and then break? For example (in some pseudo-code): time = int(raw_input('Enter the amount of seconds you want to run this: ')) while there is still time left: #run this block or even better: import sys time = sys.argv[1] while there is still time left: #run this block Thanks for any help. Also, additional online guides and tutorials would be much appreciated. I really like Byte of Python. Dive into Python can't quite hold my attention, though. I suppose I should suck it up and try harder to read that one.

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• Python library to validate Excel data

  - by Stan

  Is there any existing Python library that can validate data in Excel format? Or what kind of keyword should I use to search such an open source project? Thanks.

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• C++ code generation with Python

  - by norapinephrine

  Can anyone point me to some documentation on how to write scripts in Python (or Perl or any other Linux friendly script language) that generate C++ code from XML or py files from the command line. I'd like to be able to write up some xml files and then run a shell command that reads these files and generates .h files with fully inlined functions, e.g. streaming operators, constructors, etc.

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• JSON | Django passing python list

  - by MMRUser

  Hi, I'm trying to send a Python list in to client side (encoded as JSON), this is the code snippet which I have written: array_to_js = [vld_id, vld_error, False] array_to_js[2] = True jsonValidateReturn = simplejson.dumps(array_to_js) return HttpResponse(jsonValidateReturn, mimetype='application/json') So my question is how to access it form client side, can I access it like this: jsonValidateReturn[0] or how I assign a name to the returned JSON array in order to access it?

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• Web scraping with Python

  - by Nimbuz

  I'd like to grab daily sunrise/sunset times from here. Is it possible to scrape web content with Python? what are the modules used? Is there any tutorial available? Thanks

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• Using wget via Python

  - by CoreIs

  How would I download files (video) with Python using wget and save them locally? There will be a bunch of files, so how do I know that one file is downloaded so as to automatically start downloding another one? Thanks.

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• python create object and add attributes to it

  - by John

  Hi, I want to create a dynamic object (inside another object) in python and then add attributes to it. I tried: obj = someobject obj.a = object() setattr(obj.a, 'somefield', 'somevalue') but this didn't work. Any ideas? Thanks

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• Add windows commands in python

  - by geocheats2

  Can anyone tell me how to add the shutdown.exe to python and how . i also want to set and variables like shutdown.exe -f -s -t 60

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• merging in python

  - by Abruzzo Forte e Gentile

  Hi all I have the following 4 arrays ( grouped in 2 groups ) that I would like to merge in ascending order by the keys array. I can use also dictionaries as structure if it is easier. Has python any command or something to make this quickly possible? Regards MN # group 1 [7, 2, 3, 5] #keys [10,11,12,26] #values [0, 4] #keys [20, 33] #values # I would like to have [ 0, 2, 3, 4, 5, 7 ] # ordered keys [20, 11,12,33,26,33] # associated values

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