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18 lines
474 B
18 lines
474 B
import math
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import operator
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def _nonneg_int_or_fail(n, var_name, strict=True):
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try:
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if strict:
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# Raises an exception if float
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n = operator.index(n)
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elif n == math.floor(n):
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n = int(n)
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else:
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raise ValueError()
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if n < 0:
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raise ValueError()
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except (ValueError, TypeError) as err:
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raise err.__class__(f"{var_name} must be a non-negative integer") from err
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return n
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