[Tutor] Testing dymamically created methods

[Thomas Maier]

Hi all,

I would like to use some existing tool like py.test or nose to
run my tests, but I failed to do so.
The problem is as follow. I have tests:

### test_methods.py ###
def test_one():
assert 1 == 1

def test_two():
assert 1 == 1

#

I have abstraction layer that keeps information
about this test, like method name.
It's simple JSON file.

Then I have the test runner:

### test_runner.py ###
def read_test_definition():
   """read the JSON file and returns dict with test details"""

def test_run():
   my_test_data = read_test_definition()
   import test_methods
   for testid in my_test_data:
   my_method = my_test_data[testid]
   # here the 'my_method' is equal 'test_one' or 'test_two', hope
it's clear..
   test_method = getattr(test_methods, my_method)
   test_method()

###

This code works without py.test or nosetests. For example if I use print
instead of 'assert'.
Both py.test and nosetests failed to execute this correctly.
Or maybe they do execute it correctly, I just don't understand it..:)
They both report only single test was executed.
I would like to see test report for each method executed in 'for' loop.
Is it possible?

PS. Sorry for my ignorance, I just started to learn Python last week.

Thanks,
Thomas
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Re: [Tutor] Testing dymamically created methods

[Thomas Maier]

On Tue, Jan 10, 2012 at 3:31 PM, Walter Prins  wrote:
> Hi,
>
> On 10 January 2012 12:15, Thomas Maier  wrote:
>> This code works without py.test or nosetests. For example if I use print
>> instead of 'assert'.
>> Both py.test and nosetests failed to execute this correctly.
>> Or maybe they do execute it correctly, I just don't understand it..:)
>> They both report only single test was executed.
>> I would like to see test report for each method executed in 'for' loop.
>> Is it possible?
>
> For nose, I *think* you can basically achieve what you want by turning
> test_run() into a generator (by essentially replacing the call to the
> test_method() with a suitable "yield" statement.   See here:
> http://readthedocs.org/docs/nose/en/latest/writing_tests.html#test-generators
Works perfect.

> Additionally you might also look at the TestLoader functionality for
> taking further control over how and where your tests are loaded, e.g.
> see for example nose.loader.loadTestsFromGenerator() or
> nose.loader.loadTestsFromGeneratorMethod() (or indeed all the other
> methods) here:
> http://readthedocs.org/docs/nose/en/latest/api/loader.html
Will try later.

> HTH, my $0.02 worth,
>
> Walter

Thank you very much!

Thomas
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Re: [Tutor] creating dict of dict : similar to perl hash of hash

[Thomas Maier]

On Tue, Mar 6, 2012 at 8:19 PM, David Rock  wrote:
> * Abhishek Pratap  [2012-03-06 09:50]:
>> Hi Guys
>>
>> I am looking for a way to build dictionaries of dict in python.
>>
>> For example in perl I could do
>>
>> my $hash_ref = {};
>> $hash->{$a}->{$b}->{$c} = "value";
>> if (exists $hash->{$a}->{$b}->{$c} ){ print "found value"}
>>
>> Can I do something similar with dictionaries in Python.
>
> Absolutely.  Python is very good at using nested dicts.
>
> dict = {}
> dict['a'] ={}
> dict['a']['b'] = {}
> dict['a']['b']['c']= "value"
>
>
> This is a bit brute force, but it illustrates that the intermediary keys
> need to exist.  ie, if you try to assign directly, it won't work:
>
> Type "help", "copyright", "credits" or "license" for more information.
 dict ={}
 dict['a']['b']['c'] = 'value'
> Traceback (most recent call last):
>  File "", line 1, in 
>  KeyError: 'a'
>
> Since the key 'a' doesn't exist, it throws an exception.
>
> Python is also more flexible than perl in nesting data because it
> doesn't have to be the same data type.  You can nest variables, lists,
> dicts, etc all at the same level:
>
> dict = {}
> dict['mylist'] = [1,2,3]
> dict['mystring'] = 'string'
> dict['mynum'] = 4
> dict['anotherdict'] = {}
> dict['anotherdict']['anotherstring'] = 'string2'
>
Hi David,
Mixed data types in nested data structure are possible in Perl as well:
%hash = ();
$hash{'mylist'} = [1,2,3];
$hash{'mystring'} = 'string';
$hash{'mynum'} = 4;
$hash{'anotherhash'} = {};
$hash{'anotherhash'}{'anotherstring'} = 'string2';

Thomas
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