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# Copyright (c) 2010-2024 openpyxl
from datetime import datetime
from math import isnan, isinf
import sys
VER = sys.version_info
from .numbers import NUMERIC_TYPES
def safe_string(value):
"""Safely and consistently format numeric values"""
if isinstance(value, NUMERIC_TYPES):
if isnan(value) or isinf(value):
value = ""
else:
value = "%.16g" % value
elif value is None:
value = "none"
elif isinstance(value, datetime):
value = value.isoformat()
elif not isinstance(value, str):
value = str(value)
return value
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