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import _io
import sys
def text_encoding(encoding, stacklevel=2):
"""
A helper function to choose the text encoding.
When encoding is not None, just return it.
Otherwise, return the default text encoding (i.e. "locale").
This function emits an EncodingWarning if *encoding* is None and
sys.flags.warn_default_encoding is non-zero.
This can be used in APIs with an encoding=None parameter
that pass it to TextIOWrapper or open.
However, please consider using encoding="utf-8" for new APIs.
"""
if encoding is None:
encoding = "locale"
if sys.flags.warn_default_encoding != 0:
import warnings
warnings.warn("'encoding' argument not specified.",
EncodingWarning, stacklevel + 1)
return encoding
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