BUG: Mixed period cannot be displayed with ValueError

[sinhrks]

• closes #xxxx (not reported)
• tests added / passed
• passes git diff upstream/master | flake8 --diff
• whatsnew entry

# we can create Series contains Periods with mixed freq s = pd.Series([pd.Period('2011-01', freq='M'), pd.Period('2011-02-01', freq='D')]) # print the created Series raises ValueError print(s) # ValueError: Input has different freq=D from PeriodIndex(freq=M) 

[jreback]

I would change the exception that PeriodIndex raises to maybe: IncompatibileFrequency(ValueError) and catch that. Its a more informative error I think. (its in src/periods.pyx/extract_ordinals)

[codecov-io]

Current coverage is 88.64%

Merging #12615 into master will not affect coverage as of b12fd75

@@ master #12615 diff @@ ======================================= Files 275 275 Stmts 133688 133716 +28 Branches 0 0 Methods 0 0 ======================================= + Hit 118511 118539 +28 Partial 0 0 Missed 15177 15177 

Review entire Coverage Diff as of b12fd75

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[sinhrks]

OK, changed to raise IncompatibleFrequency and fixed corresponding tests.

[jreback]

if its helpful you can import this into pandas.tseries.common. can do that in the future.

[sinhrks]

OK, added.

[jreback]

lgtm. let me know if you want to change the import now or later.

[jreback]

btw, usually just make these 1 line as the formatter will wrap it (and I think create a weird space otherwise)

[jreback]

lgtm. ping on green

[jreback]

thanks @sinhrks