maybe_infer_freq(freq)
Whether we should inherit the freq of passed data.
Comparing a DateOffset to the string "infer" raises, so we need to be careful about comparisons. Make a dummy variable :None:None:`freq_infer` to signify the case where the given freq is "infer" and set freq to None to avoid comparison trouble later on.
The following pages refer to to this document either explicitly or contain code examples using this.
pandas.core.arrays.datetimelike.validate_inferred_freq
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