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"""Contain logic for checking average files"""
import re
from .errors import InvalidCellValue
def valid_value(val):
"""Checks whether `val` is a valid value for averages"""
if re.search(r"^[0-9]+\.[0-9]{3}$", val):
return float(val)
raise InvalidCellValue(
f"Invalid value '{val}'.\n"
"Expected string representing a number with exactly three decimal "
"places.")
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