def putenv(key, value):
"""Like `os.putenv` but takes unicode under Windows + Python 2
Args:
key (pathlike): The env var to get
value (pathlike): The value to set
Raises:
ValueError
"""
key = path2fsn(key)
value = path2fsn(value)
if is_win and PY2:
try:
set_windows_env_var(key, value)
except WindowsError:
# py3 + win fails here
raise ValueError
else:
try:
os.putenv(key, value)
except OSError:
# win + py3 raise here for invalid keys which is probably a bug.
# ValueError seems better
raise ValueError
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