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• Working with a list, performing arithmetic logic in Python

  - by haea ohoh

  Suppose I have made a large list of numbers, and I want to make another one which I will add, pairwise, with the first list. Here's the first list, A: [109, 77, 57, 34, 94, 68, 96, 72, 39, 67, 49, 71, 121, 89, 61, 84, 45, 40, 104, 68, 54, 60, 68, 62, 91, 45, 41, 118, 44, 35, 53, 86, 41, 63, 111, 112, 54, 34, 52, 72, 111, 113, 47, 91, 107, 114, 105, 91, 57, 86, 32, 109, 84, 85, 114, 48, 105, 109, 68, 57, 78, 111, 64, 55, 97, 85, 40, 100, 74, 34, 94, 78, 57, 77, 94, 46, 95, 60, 42, 44, 68, 89, 113, 66, 112, 60, 40, 110, 89, 105, 113, 90, 73, 44, 39, 55, 108, 110, 64, 108] And here's B: [35, 106, 55, 61, 81, 109, 82, 85, 71, 55, 59, 38, 112, 92, 59, 37, 46, 55, 89, 63, 73, 119, 70, 76, 100, 49, 117, 77, 37, 62, 65, 115, 93, 34, 107, 102, 91, 58, 82, 119, 75, 117, 34, 112, 121, 58, 79, 69, 68, 72, 110, 43, 111, 51, 102, 39, 52, 62, 75, 118, 62, 46, 74, 77, 82, 81, 36, 87, 80, 56, 47, 41, 92, 102, 101, 66, 109, 108, 97, 49, 72, 74, 93, 114, 55, 116, 66, 93, 56, 56, 93, 99, 96, 115, 93, 111, 57, 105, 35, 99] How might I generate the arithmatic addition logic, processing each pairwise value one by one (A[0] and B[0], through A[99], B[99]) and producing the list C (A[0] + B[0] through A[99]+ B[99])?

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• python unit testing os.remove fails file system

  - by hwjp

  Am doing a bit of unit testing on a function which attempts to open a new file, but should fail if the file already exists. when the function runs sucessfully, the new file is created, so i want to delete it after every test run, but it doesn't seem to be working: class MyObject_Initialisation(unittest.TestCase): def setUp(self): if os.path.exists(TEMPORARY_FILE_NAME): try: os.remove(TEMPORARY_FILE_NAME) except WindowsError: #TODO: can't figure out how to fix this... #time.sleep(3) #self.setUp() #this just loops forever pass def tearDown(self): self.setUp() any thoughts? The Windows Error thrown seems to suggest the file is in use... could it be that the tests are run in parallel threads? I've read elsewhere that it's 'bad practice' to use the filesystem in unit testing, but really? Surely there's a way around this that doesn't invole dummying the filesystem?

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• Parsing line with delimiter in Python

  - by neversaint

  I have lines of data which I want to parse. The data looks like this: a score=216 expect=1.05e-06 a score=180 expect=0.0394 What I want to do is to have a subroutine that parse them and return 2 values (score and expect) for each line. However this function of mine doesn't seem to work: def scoreEvalFromMaf(mafLines): for word in mafLines[0]: if word.startswith("score="): theScore = word.split('=')[1] theEval = word.split('=')[2] return [theScore, theEval] raise Exception("encountered an alignment without a score") Please advice what's the right way to do it?

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• new to lists on python

  - by user1762229

  This is my current code: while True: try: mylist = [0] * 7 for x in range(7): sales = float(input("Sales for day:")) mylist[x] = sales if sales < 0: print ("Sorry,invalid. Try again.") except: print ("Sorry, invalid. Try again.") else: break print (mylist) best = max(sales) worst = min(sales) print ("Your best day had", best, "in sales.") print ("Your worst day had", worst, "in sales.") When I run it I get this: Sales for day:-5 Sorry,invalid. Try again. Sales for day:-6 Sorry,invalid. Try again. Sales for day:-7 Sorry,invalid. Try again. Sales for day:-8 Sorry,invalid. Try again. Sales for day:-9 Sorry,invalid. Try again. Sales for day:-2 Sorry,invalid. Try again. Sales for day:-5 Sorry,invalid. Try again. [-5.0, -6.0, -7.0, -8.0, -9.0, -2.0, -5.0] Traceback (most recent call last): File "C:/Users/Si Hong/Desktop/HuangSiHong_assign9_part.py", line 45, in <module> best = max(sales) TypeError: 'float' object is not iterable I am not quite sure how to code it so that, the lists do NOT take in negative values, because I only want values 0 or greater. I am not sure how to solve the TypeError issue so that the min and max values will print as in my code My last issue is, if I want to find the average value of the seven inputs that an user puts in, how should I go about this in pulling the values out of the lists Thank you so much

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• In python, a good way to remove a list from a list of dicts

  - by ensnare

  I have a list of dicts: list = [{'title': u'Politics', 'id': 1L, 'title_url': u'Politics'}, {'id': 3L, 'title_url': u'Test', 'title': u'Test'}] I'd like to remove the list item with title = 'Test' What is the best way to do this given that the order of the key/value pairs change? Thanks.

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• Python: Pickling highly-recursive objects without using `setrecursionlimit`

  - by cool-RR

  I've been getting RuntimeError: maximum recursion depth exceeded when trying to pickle a highly-recursive tree object. Much like this asker here. He solved his problem by setting the recursion limit higher with sys.setrecursionlimit. But I don't want to do that: I think that's more of a workaround than a solution. Because I want to be able to pickle my trees even if they have 10,000 nodes in them. (It currently fails at around 200.) (Also, every platform's true recursion limit is different, and I would really like to avoid opening this can of worms.) Is there any way to solve this at the fundamental level? If only the pickle module would pickle using a loop instead of recursion, I wouldn't have had this problem. Maybe someone has an idea how I can cause something like this to happen, without rewriting the pickle module? Any other idea how I can solve this problem will be appreciated.

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• Make python display help screen if no action is given

  - by luckytaxi

  Let's say a user runs the script w/o giving any paramters. How can I make it so that it defaults to ./myscript.py -h so that it shows them the help info? parser = optparse.OptionParser() parser.add_option("-d", "--directory", metavar="DIR", help="Directory to scan for big files") parser.add_option("-e", "--email", metavar='EMAIL', help='email to send the list to') parser.add_option("-l", "--limit", metavar='LIMIT', help='return number of files')

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• Python - Differences between elements of a list

  - by psihodelia

  Given a list of numbers how to find differences between every (i)-th and (i+1)-th of its elements? Should one better use lambda or maybe lists comprehension?

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• EOF error using recv in python

  - by tipu

  I am doing this in my code, HOST = '192.168.1.3' PORT = 50007 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) query_details = {"page" : page, "query" : query, "type" : type} s.send(str(query_details)) #data = eval(pickle.loads(s.recv(4096))) data = s.recv(16384) But I am continually getting EOF at the last line. The code I am sending with, self.request.send(pickle.dumps(results))

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• Python lookup hostname from IP with 1 second timeout

  - by ensnare

  How can I look up a hostname given an IP address? Furthermore, how can I specify a timeout in case no such reverse DNS entry exists? Trying to keep things as fast as possible. Or is there a better way? Thank you!

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• python __init__ how to return a value

  - by lakshmipathi

  I have class with __init__ function. How to return a integer value from this function when a object is created

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• Python Pandas operate on row

  - by wuha

  Hi my dataframe look like: Store,Dept,Date,Sales 1,1,2010-02-05,245 1,1,2010-02-12,449 1,1,2010-02-19,455 1,1,2010-02-26,154 1,1,2010-03-05,29 1,1,2010-03-12,239 1,1,2010-03-19,264 Simply, I need to add another column called '_id' as concatenation of Store, Dept, Date like "1_1_2010-02-05", I assume I can do it through df['id'] = df['Store'] +'' +df['Dept'] +'_'+df['Date'], but it turned out to be not. Similarly, i also need to add a new column as log of sales, I tried df['logSales'] = math.log(df['Sales']), again, it did not work.

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• Unicode filename to python subprocess.call()

  - by otrov

  I'm trying to run subprocess.call() with unicode filename, and here is simplified problem: n = u'c:\\windows\\notepad.exe ' f = u'c:\\temp\\nèw.txt' subprocess.call(n + f) which raises famous error: UnicodeEncodeError: 'ascii' codec can't encode character u'\xe8' Encoding to utf-8 produces wrong filename, and mbcs passes filename as new.txt without accent I just can't read any more on this confusing subject and spin in circle. I found here lot of answers for many different problems in past so I thought to join and ask for help myself Thanks

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• module to use when parsing .properties file in Python

  - by Tshepang

  configparser raises an exception if one parses a simple .properties (key/value) file wich lacks section headers; other than rolling out code myself, is there some module that allows me to do this?

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• Using popen, but text looks weird - Python

  - by RadiantHex

  Hi folks, I'm using os.popen() in order to run a few commands. This is what "man ls" looks like: Any ideas why the text is displayed as such. I tried both Arial and Consolas fonts. Help would be amazing! Thanks

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• Adding percentage in python - xlwt / pyexcelerator

  - by konjo

  Hello, just a quick question, how to add percent sign to numbers without modifying number. I have tried format percent with myStyleFont.num_format_str = '0.00%' but it multiplies with 100 but I need just to append percent. Ty in advance. Regards.

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• how to write or create (when no exist) a file using python and Google AppEngine

  - by zjm1126

  this is my code: f = open('text/a.log', 'wb') f.write('hahaha') f.close() and it is not create a new file when not exist how to do this , thanks updated class MyThread(threading.Thread): def run(self): f = open('a.log', 'w') f.write('hahaha') f.close() error is : Traceback (most recent call last): File "D:\Python25\lib\threading.py", line 486, in __bootstrap_inner self.run() File "D:\zjm_code\helloworld\views.py", line 15, in run f = open('a.log', 'w') File "d:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 1188, in __init__ raise IOError('invalid mode: %s' % mode) IOError: invalid mode: w

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• Python function argument scope (Dictionaries v. Strings)

  - by Shaun Meyer

  Hello, given: foo = "foo" def bar(foo): foo = "bar" bar(foo) print foo # foo is still "foo"... foo = {'foo':"foo"} def bar(foo): foo['foo'] = "bar" bar(foo) print foo['foo'] # foo['foo'] is now "bar"? I have a function that has been inadvertently over-writing my function parameters when I pass a dictionary. Is there a clean way to declare my parameters as constant or am I stuck making a copy of the dictionary within the function? Thanks!

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• How to remove characters from Python list?

  - by Anry

  I have a LIST: ['tag1', 'tag2', 'tag3 tag3', ...] How do I delete [, ], '. I want to get a string: "tag1, tag2, tag3 tag3, ..."

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• Python: Lits containg tuples and long int.

  - by Yasmin

  I have a list containing a tuples and long integers the list looks like this: table = [(1L,), (1L,), (1L,), (2L,), (2L,), (2L,), (3L,), (3L,)] How do i convert the table to look like a formal list? so the output would be: table = ['1','1','1','2','2','2','3','3'] For information purposes the data was obtained from a mysql database.

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• Best way to design a class in python

  - by Fraz

  So, this is more like a philosophical question for someone who is trying to understand classes. Most of time, how i use class is actually a very bad way to use it. I think of a lot of functions and after a time just indent the code and makes it a class and replacing few stuff with self.variable if a variable is repeated a lot. (I know its bad practise) But anyways... What i am asking is: class FooBar: def __init__(self,foo,bar): self._foo = foo self._bar = bar self.ans = self.__execute() def __execute(self): return something(self._foo, self._bar) Now there are many ways to do this: class FooBar: def __init__(self,foo): self._foo = foo def execute(self,bar): return something(self._foo, bar) Can you suggest which one is bad and which one is worse? or any other way to do this. This is just a toy example (offcourse). I mean, there is no need to have a class here if there is one function.. but lets say in __execute something() calls a whole set of other methods.. ?? Thanks

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• Converting html entities into their values in python

  - by tipu

  I use this regex on some input, [^a-zA-Z0-9@#] However this ends up removing lots of html special characters within the input, such as 227;, #1606;, #1588; (i had to remove the & prefix so that it wouldn't show up as the actual value..) is there a way that I can convert them to their values so that it will satisfy the regexp expression? I also have no idea why the text decided to be so big.

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• Using a Loop to add objects to a list(python)

  - by Will

  Hey guys so im trying to use a while loop to add objects to a list. Heres bascially what i want to do: (ill paste actually go after) class x: blah blah choice = raw_input(pick what you want to do) while(choice!=0): if(choice==1): Enter in info for the class: append object to list (A) if(choice==2): print out length of list(A) if(choice==0): break ((((other options)))) as im doing this i can get the object to get added to the list, but i am stuck as to how to add multiple objects to the list in the loop. Here is my actual code i have so far... print "Welcome to the Student Management Program" class Student: def init (self, name, age, gender, favclass): self.name = name self.age = age self.gender = gender self.fac = favclass choice = int(raw_input("Make a Choice: " )) while (choice !=0): if (guess==1): print("STUDENT") namer = raw_input("Enter Name: ") ager = raw_input("Enter Age: ") sexer = raw_input("Enter Sex: ") faver = raw_input("Enter Fav: ") elif(guess==2): print "TESTING LINE" elif(guess==3): print(len(a)) guess=int(raw_input("Make a Choice: ")) s = Student(namer, ager, sexer, faver) a =[]; a.append(s) raw_input("Press enter to exit") any help would be greatly appreciated!

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• Python: find <title>

  - by Peter

  I have this: response = urllib2.urlopen(url) html = response.read() begin = html.find('<title>') end = html.find('</title>',begin) title = html[begin+len('<title>'):end].strip() if the url = http://www.google.com then the title have no problem as "Google", but if the url = "http://www.britishcouncil.org/learning-english-gateway" then the title become "<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <base href="http://www.britishcouncil.org/" /> <META http-equiv="Content-Type" Content="text/html;charset=utf-8"> <meta name="WT.sp" content="Learning;Home Page Smart View" /> <meta name="WT.cg_n" content="Learn English Gateway" /> <META NAME="DCS.dcsuri" CONTENT="/learning-english-gateway.htm">..." What is actually happening, why I couldn't return the "title"?

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• Steps in list question, Python beginner

  - by shin

  Why does not the following code output 10, 8, 6, 4, 2? >>> numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> numbers[:1:-2] [10, 8, 6, 4]

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