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Extend python lists operations using .NET's LINQ syntax for clean and fast coding.

License: Apache License 2.0

Python 100.00%
python python3 metadata metaprogramming syntax robustness development-tools powerful linq csharp

linqit's Issues

A bug at the project description page 

new_kids_in_town = [Person('Chris', 18), Person('Danny', 16), Person('John', 17)]
people += new_kids_in_town # Also works: people = people.concat(new_kids_in_town)

teenagers = people.where(lambda p: 20 >= p.age >= 13)
danny = teenagers.first(lambda t: t.name == 'Danny')            # <Person name="Danny" age="16">
oldest_teen = teenagers.last()                                  # <Person name="Chris" age="18">

.last() method doesn't return max age but the last in the list, right? Should return "John,17 yo" then.

Wrong example in README

The README says:

from linqit import List


programmers = List()
Avi = type('Avi', (), {})

# Go ahead and fill the list with whatever you want... like a list of <Programmer> objects.

# Then play:
last_hot_pizza_slice = programmers.where(lambda e:e.experience > 15)
                      .except_for(elon_musk)
                      .of_type(Avi)
                      .take(3) # [<Avi>, <Avi>, <Avi>]
                      .select(lambda avi:avi.lunch) # [<Pizza>, <Pizza>, <Pizza>]
                      .where(lambda p:p.is_hot() and p.origin != 'Pizza Hut').
                      .last() # <Pizza>
                      .slices.last() # <PizzaSlice>
                      
# What do you think?

I think there's a syntax error… .except_for(elon_musk) is not part of the last_hot_pizza_slice = … statement. You may add parenthesis around the whole statement.

I also think that there is an extra dot after p.origin != 'Pizza Hut')

You may also use black to format the code. This would finally give:

from seven_dwwarfs import Grumpy, Happy, Sleepy, Bashful, Sneezy, Dopey, Doc
from linqit import List


programmers = List()
Avi = type("Avi", (), {})

# Go ahead and fill the list with whatever you want... like a list of <Programmer> objects.

# Then play:
last_hot_pizza_slice = (
    programmers.where(lambda e: e.experience > 15)
    .except_for(elon_musk)
    .of_type(Avi)
    .take(3)  # [<Avi>, <Avi>, <Avi>]
    .select(lambda avi: avi.lunch)  # [<Pizza>, <Pizza>, <Pizza>]
    .where(lambda p: p.is_hot() and p.origin != "Pizza Hut")
    .last()  # <Pizza>
    .slices.last()  # <PizzaSlice>
)

# What do you think?

BTW, your project seems fun to try, thanks for what you've done.

Add support for order_by?

Hey, great library. I would love to do something like this but seems to just use the substandard built-in list implementation which returns None:

people = List()
people.append(Person("Michael", 47))
people.append(Person("Sarah", 50))
people.append(Person("Jake", 42))

older = people.where(lambda p: p.age > 43).sort(lambda p: -p.age)

But sadly, sort returns None and I didn't see an order_by, what am I missing?

Add support for short circuit all/any

In looking at the code I can see that the all/any methods traverse the whole list. I have a tested fix with short circuiting for these methods...but have never done pull requests...

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