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asq is simple implementation of a LINQ-inspired API for Python which operates over Python iterables

License: MIT License

Python 100.00%

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asq's Issues

Query Chaining docs have a layout mistake

The narrative documentation for 'Query Chaining' includes a Note as part of a 
code sample.  The RestructuredText formatting is awry here.

Original issue reported on code.google.com by [email protected] on 6 Jun 2011 at 8:19

short import

Use from asq import query instead of from asq.initiators import query.

I read the readme.md every time when I try to use this library.

So sad.

Inherit from Queryable

Hello,

I'd like to create a custom collection which inherits from Queryable but which also have some specific methods.

My first idea was to do:

from asq.queryables import Queryable


class DoableResults(Queryable):
    def __init__(self, context, results) -> None:
        super().__init__(results)
        self._context = context

    def do_it(self):
        print("Let's do it with %s" % self._context)

unfortunately if I do

results = DoableResults(None, [1, 2, 3, 4, 5, 6])
results.do_it()

works fine but if I do

results.where(lambda n: n>2)

it returns a Queryable... I was expecting it to return a DoableResults

I had a look at doc to see if you wrote some information about that
https://asq.readthedocs.io/en/latest/search.html?q=inheritance
but couldn't find much information

So what is a proper way to inherit from Queryable?

I noticed https://asq.readthedocs.io/en/latest/narrative.html#extending-asq

but I don't think it's a correct way to do what I'm looking for as it will create a do_it method for any Queryable which is not what I'm looking for.

Some help to tackle this will be great!

Kind regards

to_dictionary() to_lookup() default for Grouping

Just a suggestion, that Grouping.to_dictionary() without key and value selectors must behave as to_dictionary(key_selector=lambda x: x.key, value_selector=lambda x: x.to_list())
Just make dict with key->list_of_values structure.

Same for to_lookup()

where cause an empty sequence

What steps will reproduce the problem?
>>> from asq.initiators import query
>>> x = query([1,2,3,4,5]).where(lambda x: x % 2 == 0)
>>> x.count()
2
>>> x.first()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/entity/python-2.7.3/lib/python2.7/site-packages/asq-1.0-py2.7.egg/asq/queryables.py", line 1486, in first
    return self._first() if predicate is None else self._first_predicate(predicate)
  File "/usr/local/entity/python-2.7.3/lib/python2.7/site-packages/asq-1.0-py2.7.egg/asq/queryables.py", line 1492, in _first
    raise ValueError("Cannot return first() from an empty sequence.")
ValueError: Cannot return first() from an empty sequence.

What is the expected output? What do you see instead?
I think no error because I don't get error in C#

What version of the product are you using? On what operating system?
asq 1.0 (replace queryables.py with 1.0.1 branch's queryables.py) / Python 
2.7.3 on cygwin

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 29 May 2012 at 6:56

order_by(self, func=identity, descending=False)

Hello,

I noticed

asq/asq/queryables.py

Line 609 in db0c4cb

def order_by(self, key_selector=identity):

and

asq/asq/parallel_queryable.py

Line 166 in db0c4cb

def order_by(self, func=identity):

I wonder if having descending keyword couldn't be a nice API improvement.

when descending is True, order_by_descending will be called.

What is your opinion?

Kind regards

fun api

Currently, selector only accepts callable.

Suggest:

Accept str and list like:

def order_by(self, selector):
    if callable(selector):
        pass
    elif isinstance(selector, str):
        selector = operator.attrgetter(selector)
    elif isinstance(selector, list):
        if len(selector) == 1:
            selector = operator.itemgetter(selector[0])
        else:
            raise TypeError
    else:
        raise TypeError
    ...

Outer join

Asq only does inner join using the join function. How can we do other types of join like left outer join?

order_by cause an empty sequence

What steps will reproduce the problem?
>>> x = query([1,2,3]); _ = x.count(); x.first()
1
>>> x = query([1,2,3]).order_by(); _ = x.count(); x.first()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "build/bdist.cygwin-1.7.9-i686/egg/asq/queryables.py", line 1477, in first
  File "build/bdist.cygwin-1.7.9-i686/egg/asq/queryables.py", line 1483, in _first
ValueError: Cannot return first() from an empty sequence.

What is the expected output? What do you see instead?
I think no error because I don't get error in C#

What version of the product are you using? On what operating system?
asq 1.0 / Python 2.7.3 on cygwin

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 19 May 2012 at 3:10

Iterable from order_by not behaving as expected.

What steps will reproduce the problem?

This code:

dates = query(directories).where(is_date).order_by()
for date in dates:
    pass

doesn't enter the loop (the sequence is empty),

whereas this code does:

dates = query(directories).where(is_date).order_by().to_list()
for date in dates:
    pass

Original issue reported on code.google.com by [email protected] on 8 Nov 2011 at 9:00

negative index when using last() on OrderedQueryable

$ python3
>>> from asq.initiators import query
>>> with open('/usr/bin/dict/words', 'r') as words_file:
>>>     words = query(words_file).select(str.strip).to_list()
...
>>> query(words).order_by(len).last()
Traceback (most recent call last):
  File "/Users/rjs/dev/virtualenvs/meetup3/lib/python3.3/site-packages/asq/queryables.py", line 2248, in __getitem__
    return self.element_at(index)
  File "/Users/rjs/dev/virtualenvs/meetup3/lib/python3.3/site-packages/asq/queryables.py", line 808, in element_at
    raise OutOfRangeError("Attempt to use negative index.")
asq.queryables.OutOfRangeError: Attempt to use negative index.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/rjs/dev/virtualenvs/meetup3/lib/python3.3/site-packages/asq/queryables.py", line 1709, in _last
    return self._iterable[-1]
  File "/Users/rjs/dev/virtualenvs/meetup3/lib/python3.3/site-packages/asq/queryables.py", line 2250, in __getitem__
    raise IndexError(str(e))
IndexError: Attempt to use negative index.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/rjs/dev/virtualenvs/meetup3/lib/python3.3/site-packages/asq/queryables.py", line 1704, in last
    return self._last() if predicate is None else self._last_predicate(predicate)
  File "/Users/rjs/dev/virtualenvs/meetup3/lib/python3.3/site-packages/asq/queryables.py", line 1711, in _last
    raise ValueError("Cannot return last() from an empty sequence.")
ValueError: Cannot return last() from an empty sequence.

What is the expected output? What do you see instead?


Please use labels and text to provide additional information.

Original issue reported on code.google.com by [email protected] on 12 Oct 2012 at 6:44

Frequency distribution table for asq Queryable

Hello,

this is probably a bit out of the scope of asq but maybe implementing a frequency distribution table method could be a nice idea (either adding it directly in asq code, or as an example to extend asq).
The result of this frequency distribution table will be queryable also
Your opinion ?

Kind regards

The setup.py script imports the asq package, which can fail if ordered dict is not available.

What steps will reproduce the problem?
  1. easy_install asq on a Python environment without ordereddict available (e.g. Python 2.6)

What is the expected output?

  The install should complete successfully.

What do you see instead?

$ easy_install asq
Searching for asq
Reading http://pypi.python.org/simple/asq/
Reading http://code.google.com/p/asq/
Reading http://code.google.com/p/asq/downloads/detail?name=asq-0.9.tar.gz
Best match: asq 0.9
Downloading http://asq.googlecode.com/files/asq-0.9.tar.gz
Processing asq-0.9.tar.gz
Running asq-0.9/setup.py -q bdist_egg --dist-dir 
/var/folders/yD/yD0vSdTiEMe6tWqFrULex++++TI/-Tmp-/easy_install-j0e6ZT/asq-0.9/eg
g-dist-tmp-JP8crp
Could not import OrderedDict. For Python versions earlier than 2.7 install 
theordereddict module from the Python Package Index with easy_install 
ordereddict.error: Setup script exited with 1

What version of the product are you using? On what operating system?

  Python 2.6 on Max OS X.

Please provide any additional information below.

  If ordered dict is installed, the the installation proceeds successfully.

Original issue reported on code.google.com by [email protected] on 14 Mar 2011 at 8:13

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