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from typing import List, Dict
def obfuscate_data(
data: List[Dict[str, str]], pii_fields: List[str]
) -> List[Dict[str, str]]:
"""
A function to obfuscate PII fields in a list of dictionaries, replacing
sensitive values with a string of asterisks.
"""
for record in data:
missing_pii_fields = [field for field in pii_fields if field not in record]
if missing_pii_fields:
raise ValueError(
f"A record is missing required PII fields: {missing_pii_fields}"
)
return [
{k: ("***" if k in pii_fields else v) for k, v in record.items()}
for record in data
]
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