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CI: fix mypy error #30052

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CI: fix mypy error #30052

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16 changes: 14 additions & 2 deletions pandas/tseries/frequencies.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
from datetime import timedelta
import re
from typing import Dict, Optional
from typing import Dict, Optional, Tuple, Union, overload

import numpy as np
from pytz import AmbiguousTimeError
Expand Down Expand Up @@ -70,7 +70,19 @@ def get_period_alias(offset_str: str) -> Optional[str]:
}


def to_offset(freq) -> Optional[DateOffset]:
@overload
def to_offset(freq: None) -> None:
...


@overload
def to_offset(
freq: Union[str, Tuple[str, int], Tuple[int, str], timedelta, DateOffset]
) -> DateOffset:
...


def to_offset(freq):
"""
Return DateOffset object from string or tuple representation
or datetime.timedelta object.
Expand Down