The tstools package

We now have a tstools directory with 3 modules:

analysis1/
      tstools/
  	      __init__.py
  	      moments.py
  	      vis.py
  	      show_extremes.py
      data/

In a way, the directory tstools is already a package, in the sense that it is possible to import functions from the modules:

import numpy as np

import tstools.moments
from tstools.vis import plot_histogram

timeseries = np.genfromtxt("./data/brownian.csv", delimiter=",")

mean, var = tstools.moments.get_mean_and_var(timeseries)
fig, ax = tstools.vis.plot_histogram(timeseries)

Let’s try to import the package as a whole:

# compute-mean.py
import numpy as np

import tstools

timeseries = np.genfromtxt("./data/brownian.csv", delimiter=",")

mean = tstools.moments.get_mean_and_var(timeseries)

$ python compute_mean.py
Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
AttributeError: module 'tstools' has no attribute 'moments'

What happened here?

When importing the directory tstools, the python interpreter looks for a file named __init__.py inside this directory and imports this python file. If this python file is empty, or simply doesnt exists… nothing is imported.

In the following section we add some import statements into the __init__.py so that all our functions (in the three modules) ar available under the single namespae tstools.