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transform a list of objects into a list of integers that pass a check


transform a list of objects into a list of integers that pass a check

By : Victor Soares Burszt
Date : November 26 2020, 04:01 AM
I hope this helps . Given not all the values of the map are integers, you'll need to first check whether the element is an Integer then map it and then check whether it's less than five and if so then print the element.
code :
map1.values()
    .stream()
    .filter(e -> e instanceof Integer) // is this number an integer? if yes then you can pass else no
    .map(e -> (Integer)e) // map to integer so we can compare with '<' symbol
    .filter(e -> e < 5) 
    .forEach(System.out::println);


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Convert list of objects to a list of integers and a lookup table

Convert list of objects to a list of integers and a lookup table


By : travisd
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further defaultdict combined with the itertools.count().next method is a good way to assign identifiers to unique items. Here's an example of how to apply this in your case:
code :
from itertools import count
from collections import defaultdict

def create_lookup_list(data, domains):
    domain_keys = defaultdict(lambda:defaultdict(count().next))
    out = []
    for row in data:
        out.append(tuple(domain_keys[dom][val] for val, dom in zip(row, domains)))
    lookup_table = dict((k, sorted(d, key=d.get)) for k, d in domain_keys.items())
    return out, lookup_table
Transform list of complex objects to flatt list with LINQ

Transform list of complex objects to flatt list with LINQ


By : surfkite
Date : March 29 2020, 07:55 AM
should help you out This will create an anonymous object with all the flatten fields, supposing they are public.
code :
var flat = vehicles.Select(x => new {
    vid = x.vid,
    name = x.name,
    desc = x.desc,
    carId = x.car.id,
    carColor = x.car.color;
    carManual = x.car.manual;
    carModel = x.car.model; 
    truckId = x.truck.id,
    truckWidth = x.truck.width,
    truckHeigh = x.truck.heigh,
    tankId = x.tank.id,
    tankColor = x.tank.color,
    tankSize = x.tank.size
});
How to gather multiple int properties from a list of objects in a list of integers using lambda or linq?

How to gather multiple int properties from a list of objects in a list of integers using lambda or linq?


By : Tohkads Wadjing
Date : March 29 2020, 07:55 AM
help you fix your problem I have tried this C# code: , You can use SelectMany:
code :
var listOfInts = items.SelectMany(p => new[] { p.a, p.b })
                      .Distinct()
                      .OrderByDescending(x => x)
                      .ToList();
In python, how do you print a list of steps to transform a list of integers into a provided second list of integers?

In python, how do you print a list of steps to transform a list of integers into a provided second list of integers?


By : user37845
Date : March 29 2020, 07:55 AM
seems to work fine I found it. The problem is that you don't update the master list of needs (c) and resource (d). In the bottom of your code, add a couple of lines to effect those updates:
code :
               diff -= number_to_move
               importer_diff += number_to_move
               c[i] -= number_to_move
               d[i] += number_to_move
locations = {
    0: "A",
    1: "B",
    2: "C",
    3: "D"
}

def print_move_line(number_to_move, exporter, importer):
    line = "Move " + str(number_to_move) + " from " + locations.get(exporter, "bad location") + "_to_" + locations.get(importer, "bad location")
    print line


def get_steps(have, want):
    for exporter_index in range(0, len(have)):
        diff = have[exporter_index] - want[exporter_index]

        # Move 'diff' units from bin 'exporter_index' to others;
        #   offer valid only while supplies last.
        while diff > 0:
            for j in range(1, len(have)):
                # Start next to the exporter and wrap around.
                importer_index = (exporter_index + j) % len(have)
                print("  DEBUG: have", have, "want", want, "\t", exporter_index, "to", importer_index)
                importer_diff = have[importer_index] - want[importer_index]

                # If this bin needs units, move what we have.
                if importer_diff < 0:
                    number_to_move = min(diff, (-importer_diff))
                    print("  DEBUG: bin", importer_index, "needs", importer_diff, "donor has", diff)
                    diff -= number_to_move
                    have[exporter_index] -= number_to_move
                    importer_diff -= number_to_move
                    have[importer_index] += number_to_move
                    print_move_line(number_to_move, exporter_index, importer_index)

get_steps([2, 2, 2, 1], [4, 3, 0, 0])
('  DEBUG: have', [2, 2, 2, 1], 'want', [4, 3, 0, 0], '\t', 2, 'to', 3)
('  DEBUG: have', [2, 2, 2, 1], 'want', [4, 3, 0, 0], '\t', 2, 'to', 0)
('  DEBUG: bin', 0, 'needs', -2, 'donor has', 2)
Move 2 from C_to_A
('  DEBUG: have', [2, 2, 4, 1], 'want', [2, 3, 0, 0], '\t', 2, 'to', 1)
('  DEBUG: bin', 1, 'needs', -1, 'donor has', 0)
Move 0 from C_to_B
('  DEBUG: have', [2, 2, 4, 1], 'want', [2, 3, 0, 0], '\t', 3, 'to', 0)
('  DEBUG: have', [2, 2, 4, 1], 'want', [2, 3, 0, 0], '\t', 3, 'to', 1)
('  DEBUG: bin', 1, 'needs', -1, 'donor has', 1)
Move 1 from D_to_B
('  DEBUG: have', [2, 2, 4, 2], 'want', [2, 2, 0, 0], '\t', 3, 'to', 2)
[wdwickar@wdwickar-ws pyside]$ python so.py
('  DEBUG: have', [2, 2, 2, 1], 'want', [4, 3, 0, 0], '\t', 2, 'to', 3)
('  DEBUG: have', [2, 2, 2, 1], 'want', [4, 3, 0, 0], '\t', 2, 'to', 0)
('  DEBUG: bin', 0, 'needs', -2, 'donor has', 2)
Move 2 from C_to_A
('  DEBUG: have', [4, 2, 0, 1], 'want', [4, 3, 0, 0], '\t', 2, 'to', 1)
('  DEBUG: bin', 1, 'needs', -1, 'donor has', 0)
Move 0 from C_to_B
('  DEBUG: have', [4, 2, 0, 1], 'want', [4, 3, 0, 0], '\t', 3, 'to', 0)
('  DEBUG: have', [4, 2, 0, 1], 'want', [4, 3, 0, 0], '\t', 3, 'to', 1)
('  DEBUG: bin', 1, 'needs', -1, 'donor has', 1)
Move 1 from D_to_B
('  DEBUG: have', [4, 3, 0, 0], 'want', [4, 3, 0, 0], '\t', 3, 'to', 2)
Remove duplicate list of integers present inside a list of list without considering ordering of the lists of integers

Remove duplicate list of integers present inside a list of list without considering ordering of the lists of integers


By : Adam Kerpelman
Date : March 29 2020, 07:55 AM
I wish this helpful for you This is one solution using the 3rd party toolz library. Note compose and unique recipes are lazy and easy to extract from the respective source code if you do not have access to the library.
Notice we sort each sublist and then convert to an immutable tuple. This allows unique to form and track a set of values for O(1) lookup.
code :
from toolz import unique, compose

l1 = [[1, 2, -1], [1, 0, 1], [2, 1, -1], [1, -1, 2]]

res = list(unique(l1, key=compose(tuple, sorted)))

print(res)

[[1, 2, -1], [1, 0, 1]]
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