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"""Contain logic for checking average files"""
from typing import Union
from .utils import cell_error
from .errors import InvalidValue
def invalid_value(line_number: int, column_number: int, val: str) -> Union[
InvalidValue, None]:
"""Return an `InvalidValue` object if `val` is not a valid "averages"
value."""
return cell_error(
r"^[0-9]+\.[0-9]{3}$", val, line=line_number, column=column_number,
value=val, message=(
f"Invalid value '{val}'. "
"Expected string representing a number with exactly three "
"decimal places."))
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