PeriodIndex given. Check the `freq` attribute instead of using infer_freq.

Package:

pandas

30911

Exception Class:

TypeError

Raise code

index = values

    inferer: _FrequencyInferer

    if not hasattr(index, "dtype"):
        pass
    elif is_period_dtype(index.dtype):
        raise TypeError(
            "PeriodIndex given. Check the `freq` attribute "
            "instead of using infer_freq."
        )
    elif is_timedelta64_dtype(index.dtype):
        # Allow TimedeltaIndex and TimedeltaArray
        inferer = _TimedeltaFrequencyInferer(index, warn=warn)
        return inferer.get_freq()

    if

Links to the raise (1)

https://github.com/pandas-dev/pandas/blob/b3e335254f46a526ee3ce9bb757eac4011d9d1fe/pandas/tseries/frequencies.py#L176

Ways to fix

Summary: use DatetimeIndex or TimedeltaIndex instead of PeriodIndex as the data type for the "index" function parameter

Code to reproduce (WRONG):

from pandas.tseries import frequencies
import pandas as pd

idx = pd.PeriodIndex(year=[2000, 2002], quarter=[1, 3])
frequencies.infer_freq(idx)

Working version (Fixed)

from pandas.tseries import frequencies
import pandas as pd

idx = pd.date_range(start='2020/01/01', end='2020/08/30', periods=30) # <--- Fix this is an example from the frequencies.py. The date_range function return DatatimeIndex which is expected for the "index" parameter that is passed to infer_freq function 
frequencies.infer_freq(idx)

Jun 03, 2021

phoang88 615

Add a possible fix

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