I have the following code which allows the user to choose between min
and max
filtering. However, min
works on element 1
but max
works on element 2
. Is there a better way to implement it?
from operator import itemgetter
data = [['A', '2', '4'], ['B', '2', '12'],
['C', '3', '88'], ['D', '4', '88']]
fn_max = False
if fn_max is True:
mx = max(data, key=itemgetter(2))[2]
mx_values = [d for d in data if d[2] == mx]
else:
mx = min(data, key=itemgetter(1))[1]
mx_values = [d for d in data if d[1] == mx]
print(mx_values)
You can put them into a function:
from operator import itemgetter
data = [['A', '2', '4'], ['B', '2', '12'],
['C', '3', '88'], ['D', '4', '88']]
def my_func(fn_max):
func, i = (max, 2) if fn_max else (min, 1)
mx = func(data, key=itemgetter(i))[i]
return [d for d in data if d[i] == mx]
fn_max = False
print(my_func(fn_max))
Output:
[['A', '2', '4'], ['B', '2', '12']]
This is arguably better (although it's unclear what you need it for, so it's hard to say if it would really be better):
data = [
['A', 2, 4],
['B', 2, 12],
['C', 3, 88],
['D', 4, 88]
]
def fn_filter(fn, column, data):
value = fn(rec[column] for rec in data)
return list(filter(lambda rec: rec[column] == value, data))
print(fn_filter(min, 1, data))
print(fn_filter(max, 2, data))
Result:
[['A', 2, 4], ['B', 2, 12]]
[['C', 3, 88], ['D', 4, 88]]
fn_filter
allows you to apply any function fn
to a specific column column
of the dataset data
and will return a list of all the records in data
that have that same value in that same column.
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