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import collections.abc
from itertools import repeat
def _ntuple(n):
def parse(x):
if isinstance(x, collections.abc.Iterable) and not isinstance(x, str):
x = tuple(x)
if len(x) == 1:
x = tuple(repeat(x[0], n))
return x
return tuple(repeat(x, n))
return parse
to_1tuple = _ntuple(1)
to_2tuple = _ntuple(2)
to_3tuple = _ntuple(3)
to_4tuple = _ntuple(4)
def as_tuple(x):
if isinstance(x, collections.abc.Iterable) and not isinstance(x, str):
return tuple(x)
if x is None or isinstance(x, (int, float, str)):
return (x,)
else:
raise ValueError(f"Unknown type {type(x)}")
def as_list_of_2tuple(x):
x = as_tuple(x)
if len(x) == 1:
x = (x[0], x[0])
assert len(x) % 2 == 0, f"Expect even length, got {len(x)}."
lst = []
for i in range(0, len(x), 2):
lst.append((x[i], x[i + 1]))
return lst
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