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group_equal_entries.py
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group_equal_entries.py
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import collections
import functools
from test_framework import generic_test
from test_framework.test_failure import TestFailure
from test_framework.test_utils import enable_executor_hook
Person = collections.namedtuple('Person', ('age', 'name'))
def group_by_age(people):
age_to_count = collections.Counter((person.age for person in people))
age_to_offset, offset = {}, 0
for age, count in age_to_count.items():
age_to_offset[age] = offset
offset += count
while age_to_offset:
from_age = next(iter(age_to_offset))
from_idx = age_to_offset[from_age]
to_age = people[from_idx].age
to_idx = age_to_offset[people[from_idx].age]
people[from_idx], people[to_idx] = people[to_idx], people[from_idx]
# Use age_to_count to see when we are finished with a particular age.
age_to_count[to_age] -= 1
if age_to_count[to_age]:
age_to_offset[to_age] = to_idx + 1
else:
del age_to_offset[to_age]
@enable_executor_hook
def group_by_age_wrapper(executor, people):
if not people:
return
people = [Person(*x) for x in people]
values = collections.Counter()
values.update(people)
executor.run(functools.partial(group_by_age, people))
if not people:
raise TestFailure('Empty result')
new_values = collections.Counter()
new_values.update(people)
if new_values != values:
raise TestFailure('Entry set changed')
ages = set()
last_age = people[0]
for x in people:
if x.age in ages:
raise TestFailure('Entries are not grouped by age')
if last_age != x.age:
ages.add(last_age)
last_age = x.age
if __name__ == '__main__':
exit(
generic_test.generic_test_main("group_equal_entries.py",
'group_equal_entries.tsv',
group_by_age_wrapper))