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"""Validate the headers"""
from quality_control.errors import InvalidHeaderValue
def valid_header(strains, headers):
"Return the valid headers with reference to strains or throw an error"
if not bool(headers[1:]):
raise InvalidHeaderValue(
"The header MUST contain at least 2 columns")
invalid_headers = tuple(
header for header in headers[1:] if header not in strains)
if invalid_headers:
raise InvalidHeaderValue(
*(f"'{header}' not a valid strain." for header in invalid_headers))
return headers
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