Re: [Pyunit-interest] improved alltests.py example

[Luciano R. <lg...@uo...>]

In Python, the parenthesis are used to denote tuples, which are=20
immutable lists. But because they are also used in expressions, there=20
is a quirk: if your tuple has only one element, Python can't tell the=20
difference from an expression. To let Python know what you mean, you=20
need to add a comma inside the parenthesis, like this:

> modules_to_test =3D ('widgettests', )

So, ('x') is a string expression equal to 'x'.
But ('x',) is a tuple with containing one element, which happens to be=20=

a string.

Regards,

Luciano


On ter=E7a-feira, dezembro 17, 2002, at 04:09 PM, Jean Czerlinski wrote:

> I am writing to suggest a minor-- but important--
> improvement in the file alltests.py file in the
> examples folder.
>
> The modules_to_test should be a true list with square
> brackets.  As it is, if you have just one module, the
> map function following it will iterate over the
> letters in the string that is the module name rather
> than seeing it as a list with one string element.  For
> example,
>
> modules_to_test =3D ('widgettests')
> map(__import__, modules_to_test)
>
> results in the error
>
> ImportError: No module named w
>
> The original code and my suggested change are shown
> below.
>
> By the way, is my terminology correct?  What do you
> call it with the curved brackets?
>
> Thanks,
>
> Jean
>
> ------------------------------------------------
> original code for alltests.py
>
> import unittest
>
> def suite():
>     modules_to_test =3D ('listtests', 'widgettests') #
> and so on
>     alltests =3D unittest.TestSuite()
>     for module in map(__import__, modules_to_test):
>
> alltests.addTest(unittest.findTestCases(module))
>     return alltests
>
> if __name__ =3D=3D '__main__':
>     unittest.main(defaultTest=3D'suite')
>
> ------------------------------------------------
> improved code for alltests.py
>
> import unittest
>
> def suite():
>     modules_to_test =3D ['listtests', 'widgettests'] #
> and so on <=3D=3D=3D  change is here: square brackets
> instead of rounded
>     alltests =3D unittest.TestSuite()
>     for module in map(__import__, modules_to_test):
>
> alltests.addTest(unittest.findTestCases(module))
>     return alltests
>
> if __name__ =3D=3D '__main__':
>     unittest.main(defaultTest=3D'suite')
>
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