Somewhat related to #6273 . I'm fairly certain though not positive that this also used to work on 0.12.x.
df = pd.DataFrame(np.random.rand(5,3))
df['date'] = ['1-1-1990', '2-1-1990', '3-1-1990', '4-1-1990', '5-1-1990']
pd.infer_freq(df['date'])
Raises Series has no attribute is_monotonic. I guess infer_freq now expects either an Index or ....?
[22]: pd.version.version
[22]: '0.13.0-472-g9109812'
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