35 Solved Topics
Remove Filter  | Hi guys, This feels like something that should be possible in Python, and something that I feel like I should know how to do. Image I have a list of numbers: items=[10,20,30] Let's say I wanted iterate over them and define two new variables, a and b. a=[] b=[] for … |
| | Hi, I'm having some difficulty reading in boolean values from a file, particularly false values. Python can understand false values as empty strings, as well as a few other ways. For example: In [43]: bool(0) Out[43]: False In [44]: bool(False) Out[44]: False In [45]: bool('') Out[45]: False The problem is, … |
| | Hi, I am trying to create the most general function possible to test if an object passed into it has mutability or not. With some prior help from pytony, it seemed that the best way to do this is to try to set and attribute. If the attribute can be … |
| | Hi, I have several functions that I'd like to operate on both mutable and immutable containers (mostly tuples vs. objects) and I'm looking for the optimal way to test for mutability in these objects. I can think of many ways to do this. For example: try setattr: do mutable stuff … |
| | Hi, I have an object subclass that I am using with a cusom __repr__() method. class NewClass(object): def __repr__(self): return ', '.join('%s=%s'%(k, v) for (k,v) in self.__dict__.items()) This works fine (leaving out some more details about my program): test=NewClass(a=1,b=2) print test a=1, b=2 But what I really want for reasons … |
| | I have a simple class that stores attributes: In [1]: class Test(object): ...: a=10 ...: b=20 I have a function that returns attributes using attrgetter, and it accepts these through the args parameter to allow a user to pass various attribute fieldnames in. For example: In [4]: def getstuff(*args): ...: … |
| | Hi, I've been having trouble posting a code snipet tonight, I keep getting this error: The code snippet in your post is formatted incorrectly. Please use the Code button in the editor toolbar when posting whitespace-sensitive text or curly braces. My code is running fine in wingware IDE with 4 … |
| | Hi, I think I have a pretty simple question but my google searches are giving me more information than I need. I think my terminology is not clear. Let's say I'm making a dictionary to hold a datatype very specific to some filetype or data of interest. Let's say I … |
| | Hi, I have been subclassing namedtuple to handle my custom data type: fields=['Query', 'u1', 'Accession] Old = namedtuple('Old', fields, verbose=False) class New(Old): def __repr__(self): return 'Overwriting works nicely' p=New('Hi',2,3) print p >>> 'Overwriting works nicely' What I want to do is to add the behavior that some of my fields … |
| | Hi guys, This is more a general discussion of methodology than a specific question. I have been working on a, the primary purpose of which is to store an oddly formatted data file (aka not you classic CSV). At the end of the day, the data is stored in a … |
| | Hi, If I have a list of strings, it's easy to output them using .join(). For example: mylist=['hi', 'there', 'girls'] myout='\t'.join(mylist) What I want to know is if there is a builtin python method that acts like join, except it automatically converts ints and floats to strings without giving a …  |
| | Real quick question. If I have a string 'hi my name is bill' and I want to reduce this to a list of letters, with no whitespaces (eg ['h', 'i', 'm', 'y'] as opposed to ['hi', 'i', ' ' , 'm', 'y', ' ', 'n'...]), is there a really quick …  |
| | Hey guys, I've looked over several Google results for basic explanations on [CODE]is / '=='[/CODE] However, I don't think I quite understand enough to know what is the ideal operator for this. [CODE]mylist=[1,2,3] if type(mylist) == list: print 'yes'[/CODE] or do I use [CODE] if type(mylise) is list: print 'yes'[/CODE] …  |
| | Hey guys, In prepping for a job interview, I'm trying to eliminate some bad habits and this trivial problem has me realizing how hard that is :'(. The problem: Print a 12 x 12 multiplication table. This is easy.... [CODE]outstring='' for i in range(1,13): for j in range(1,13): outstring +='\t'+str(i*j) … |
| | I've followed a tutorial where a Person class was used to illustrate the difference between class and instance variables. Something like: [CODE] class Person(object): population=0 def __init__(self, name): self.name=name Person.population += 1 print 'current population', Person.population Sally=Person('sally') Joe=Person('joe') [/CODE] This example really illustrated the difference between class and instance variables … |
| | Hey guys, I have a simple numpy datatype: [CODE]spec_dtype = np.dtype([ ('wavelength', float), ('intensity', float) ])[/CODE] I chose to use this in my program because it's very easy to read in 2-column spectral data files using the genfromtxt() method. Therefore, I made a fairly sizable program around this datatype. Now … |
| | I have data which has a very particular format that I'm trying to store in a numpy array. avi_05MSalt00001.txt 2012 Feb 07 20:12:41 50000 (usec) 300 10 I've defined the following numpy datatype: [CODE]timefile_dtype=numpy.dtype([ ('filename', file), ('year', int), ('month', str), #Why don't these work? ('day', int), ('time', str), ('int_time', int), … |
| | Hey everyone, I have a set of classes which, when instantiated, take up a lot of memory. I'm trying to write a program which can inspect class attributes and methods given a list of classes, without actually instantiating them. Let's say I wanted to see if the following class had … |
| | Hey everyone, this should be simple, but I keep running into errors so help is greatly appreciated. I have a large class, call it class A, which has several methods. Most of these methods modify data. [CODE]ClassA() def __init(X,Y,Z) ... .. def data_mod1(): ... def data_mod2(): ... [/CODE] I'm dealing … |
| | Hey everyone, I'm checking some bessel functions in python using mathematica, and I can't find anything online about how to import values into python with exponentials. I know how to values with exponents. For example: [CODE]x=2032.43 * 10 **23[/CODE] However, when I read in a data file, say with one …  |
| | Hey everyone, I'm making a data analysis suite in python, and want to construct a custom event handler which will reset the axis based on the data in the current subplot. To do so, I need the event handler to know what data is currently in the subplot. The matplotlib … |
| | Hey guys, I am writing a GUI program, and one of the routines requires that I choose a file to be my data file. If the data file is chosen correctly, then my program will send it to a subroutine which will perform a bunch of methods and ultimately construct … |
| | Hey everyone, I'm getting familiar with TkInter, and while it's a cool program, I'm having a hell of a time with keeping all the classes straight. As of now, I'm trying to build a program with a menubar and some other widgets. I can get the program working if I … |
| | I have a series of data files with large headers. Here is an example: [COLOR="red"]SpectraSuite Data File ++++++++++++++++++++++++++++++++++++ Date: Fri Feb 25 13:43:55 EST 2011 User: group Dark Spectrum Present: No Reference Spectrum Present: No Number of Sampled Component Spectra: 1 Spectrometers: USB2E7196 Integration Time (usec): 11000 (USB2E7196) Spectra Averaged: … |
| | I wrote a program that interactively allows you to import files directly from your HDD into another python program. When building a new program, you simply call my program, navigator, and it lets you choose a directory and it prints out a numbered list of file: file a 1 file … |
| | Hey guys, Say I had the following list: [1, 2, 2, 2, 3, 4,4] Let's assume that the list will always be integers. Does python have a built in feature which would take a sorted list, and then return the frequency that each element occurred. For example: 1 -> 1 …  |
| | Hey guys, This questions is more about organization of python modules than the actual construction therein. In my project, we have several scientists performing similar analysis on several different data sets. For each project, the science changes, but the analysis often requires almost identical data handling. For example, one project … |
| | Hey all, I have been reading some older posts on line/list manipulation, but don't quite understand exactly how to implement all of the tools that you guys are using (line.strip() for example) to get what I need. Essentially, I have a working program that iterates through data and outputs it … |
| | Hey guys, Has anyone here ever used python to produce data files which can be immediately read by excel? I thought at first if I just tab-delimited my data, I could copy and paste an entire data file into excel. This is not the case. When I take a tab … |
| | Hey guys, When using the glob import, I want it to scan all of the files in a directory, but not scan other directories in that directory. For example, say I am in a directory with the following files: [CODE]file, file1, file2, DIRECTORY1, DIRECTORY2[/CODE] When I use the glob command: …  |
| | Hey guys, A while ago, with your help, I was able to create a code which scans a data file for names, and when a new name is found, it appends it to a list. For each entry is the list, the code then opens a new file for each … |
| | Hey guys, I have been trying to search for this answer on online tutorials, but cannot figure out just what I am doing wrong. I have a list of names, and some of them have the character '/' For example: [CODE]list = [adam, bill, jon/juan][/CODE] Because later in my code, … |
| | Hey everyone, I tried a site search but it turned up cold. Has anyone here ever written a small method to take a list of names and sort them in alphabetical order? If so, would you mind posting it up, or directing me to a tutorial that would explain this … |
| | Hey fellas, I have searched for this answer for about an hour on and off and cannot find anything so sorry to have to resort to posting. I have a list [a, b, c, d] And I want to write it to a simple output file, but I want it … |
| | Hey guys, I'm new to python so if this is a silly question, pardon me. I have the following basic assignment: Take a user-specified range of lines from some data file, call it input, and write them to an output data file. What I want to do is have the … |
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