Error with the __init__ file from the fit package

Question

I'm trying to run a code I found on GitHub to achieve piecewise linear representation. The problem is that there seem to be an error in the init file of the fit package. Here's the code :

from matplotlib.pylab import gca, figure, plot, subplot, title, xlabel, ylabel, xlim,show
from matplotlib.lines import Line2D
import segment
import fit

Pull = pandas.read_csv('pull_kpi.csv', parse_dates=['pull_date'])
data = Pull[['pull_date', 'qty_late']]

from matplotlib.pylab import gca, figure, plot, subplot, title, xlabel, ylabel, xlim,show
from matplotlib.lines import Line2D
import segment
import fit

def draw_plot(data,plot_title):
    plot(range(len(data)),data,alpha=0.8,color='red')
    title(plot_title)
    xlabel("Samples")
    ylabel("Signal")
    xlim((0,len(data)-1))

def draw_segments(segments):
    ax = gca()
    for segment in segments:
        line = Line2D((segment[0],segment[2]),(segment[1],segment[3]))
        ax.add_line(line)

with open("example_data/16265-normalecg.txt") as f:
    file_lines = f.readlines()

data = [float(x.split("\t")[2].strip()) for x in file_lines[100:320]]

max_error = 0.005

#sliding window with regression
figure()
segments = segment.slidingwindowsegment(data, fit.regression, fit.sumsquared_error, max_error)
draw_plot(data,"Sliding window with regression")
draw_segments(segments)

#bottom-up with regression
figure()
segments = segment.bottomupsegment(data, fit.regression, fit.sumsquared_error, max_error)
draw_plot(data,"Bottom-up with regression")
draw_segments(segments)

#top-down with regression
figure()
segments = segment.topdownsegment(data, fit.regression, fit.sumsquared_error, max_error)
draw_plot(data,"Top-down with regression")
draw_segments(segments)



#sliding window with simple interpolation
figure()
segments = segment.slidingwindowsegment(data, fit.interpolate, fit.sumsquared_error, max_error)
draw_plot(data,"Sliding window with simple interpolation")
draw_segments(segments)

#bottom-up with  simple interpolation
figure()
segments = segment.bottomupsegment(data, fit.interpolate, fit.sumsquared_error, max_error)
draw_plot(data,"Bottom-up with simple interpolation")
draw_segments(segments)

#top-down with  simple interpolation
figure()
segments = segment.topdownsegment(data, fit.interpolate, fit.sumsquared_error, max_error)
draw_plot(data,"Top-down with simple interpolation")
draw_segments(segments)


show()

The error seems to be an invalid syntax and Python sais it occurs on the line "raise exc_type, exc_val, exc_tb".

Here is the part of the init file that creates a bug :

    # File I/O methods

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        if not exc_val:
            return self.close()

        raise exc_type, exc_val, exc_tb

Anybody can help please ?

Answer 1

The problem is that the fit package from PyPI ( GitHub ) you've installed is not compatible with Python 3 (and indeed, has last been updated 8 years ago, anyway). ( Someone else is having the same problem with Python 3 with it. )

However, that's not the package you want anyway – it doesn't even export things like sumsquared_error .

Those exports could be found in this fit.py , that repository presumably being where you've adapted your code from.

In other words:

• pip uninstall fit – it's not the droid you're looking for
• copy fit.py and wrappers.py from that repository to your project's directory