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Automatic PR for 453afc92-49d7-41d2-ab1b-303dc29ea744 #86

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Automatic PR for 453afc92-49d7-41d2-ab1b-303dc29ea744 #86

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20 changes: 14 additions & 6 deletions pandas/tseries/frequencies.py
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,10 @@ def infer_freq(
>>> pd.infer_freq(idx)
'D'
"""
from pandas.core.api import DatetimeIndex
from pandas.core.api import (
DatetimeIndex,
Index,
)

if isinstance(index, ABCSeries):
values = index._values
Expand Down Expand Up @@ -169,10 +172,15 @@ def infer_freq(
inferer = _TimedeltaFrequencyInferer(index)
return inferer.get_freq()

elif is_numeric_dtype(index.dtype):
raise TypeError(
f"cannot infer freq from a non-convertible index of dtype {index.dtype}"
)
if isinstance(index, Index) and not isinstance(index, DatetimeIndex):
if is_numeric_dtype(index.dtype):
raise TypeError(
f"cannot infer freq from a non-convertible index of dtype {index.dtype}"
)
# error: Incompatible types in assignment (expression has type
# "Union[ExtensionArray, ndarray[Any, Any]]", variable has type
# "Union[DatetimeIndex, TimedeltaIndex, Series, DatetimeLikeArrayMixin]")
index = index._values # type: ignore[assignment]

if not isinstance(index, DatetimeIndex):
index = DatetimeIndex(index)
Expand Down Expand Up @@ -622,4 +630,4 @@ def _is_weekly(rule: str) -> bool:
"is_subperiod",
"is_superperiod",
"to_offset",
]
]