matplotlib-users

[Matplotlib-users] comments in load function

[Humufr <hu...@ya...>]

       Hi John,

I saw that you add in the load function the possibility to have some 
line comment with the character '%'. I would like to change this 
function and generalize a little bit this. Not everyone is using the 
character '%' but some other like '#' or '!'. So I add this possibilty 
to the function. I don't know if you are agree with it but in case I 
join the change below.
Another things, I think there are a small bug for the Tkagg backend. 
When I close the windows instead to come back to my shell I'm arriving 
in a python shell. I tried (when I had my laptop) with the Gtkagg 
backend and I didn't notice this problem.

Thanks.

    Nicolas



def load(fname,comments='%'):
    """
    Load ASCII data from fname into an array and return the array.

    The data must be regular, same number of values in every row

    fname can be a filename or a file handle

    matfile data is not currently supported, but see
    Nigel Wade's matfile ftp://ion.le.ac.uk/matfile/matfile.tar.gz

    Example usage:

    x,y = load('test.dat')  # data in two columns

    X = load('test.dat')    # a matrix of data

    x = load('test.dat')    # a single column of data

    """

    if is_string_like(fname):
        fh = file(fname)
    elif hasattr(fname, 'seek'):
        fh = fname
    else:
        raise ValueError('fname must be a string or file handle')
   
    X = []
    numCols = None
    for line in fh:
        line = line[:line.find(comments)].strip()
        if not len(line): continue
        row = [float(val) for val in line.split()]
        thisLen = len(row)
        if numCols is not None and thisLen != numCols:
            raise ValueError('All rows must have the same number of 
columns')
        X.append(row)

    X = array(X)
    r,c = X.shape
    if r==1 or c==1:
        X.shape = max([r,c]),
    return X

Re: [Matplotlib-users] comments in load function

[John H. <jdh...@ac...>]

>>>>> "Humufr" == Humufr  <hu...@ya...> writes:

    Humufr>        Hi John, I saw that you add in the load function
    Humufr> the possibility to have some line comment with the
    Humufr> character '%'. I would like to change this function and
    Humufr> generalize a little bit this. Not everyone is using the
    Humufr> character '%' but some other like '#' or '!'. So I add
    Humufr> this possibilty to the function. I don't know if you are
    Humufr> agree with it but in case I join the change below.

OK, that's a good idea.  I added it to pylab.py.  In the future,
please add changes to the docstring as well when you change the
function, so that folks who do help(load) will get some information on
what the comments kwarg does.  Thanks...

    Humufr> Another things, I think there are a small bug for the
    Humufr> Tkagg backend. When I close the windows instead to come
    Humufr> back to my shell I'm arriving in a python shell. I tried
    Humufr> (when I had my laptop) with the Gtkagg backend and I
    Humufr> didn't notice this problem.

Not technically a bug, as it was intentional, but perhaps an
annoyance.  In order for python to work with idle, we need this line     

  os.environ['PYTHONINSPECT'] = '1'

in the show function of backends/backend_tkagg.py.  If you comment out
this line the shell will not be raised. 

Todd, any objection to making this an rc parameter, so that people can
optionally have this feature?  Something like

tk.window_focus   : False    # Maintain shell focus for TkAgg
tk.pythoninspect  : False    # True for interactive idle

JSH