[BUG] `Period` proxy object is not iterable

[galipremsagar]

Describe the bug
Period proxy object is not iterable

Steps/Code to reproduce bug

 3219      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 3220                                                      ~~~^^^^^
 3221: TypeError: 'Period' object is not iterable
 3222  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_int_key[3-None-loc] ______
 3223  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 3314      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 3315                                                      ~~~^^^^^
 3316: TypeError: 'Period' object is not iterable
 3317  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_int_key[3-None-iloc] _____
 3318  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 3409      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 3410                                                      ~~~^^^^^
 3411: TypeError: 'Period' object is not iterable
 3412  ____ ERROR at setup of TestSetitemNAPeriodDtype.test_int_key[3-nan-setitem] ____
 3413  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 3504      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 3505                                                      ~~~^^^^^
 3506: TypeError: 'Period' object is not iterable
 3507  ______ ERROR at setup of TestSetitemNAPeriodDtype.test_int_key[3-nan-loc] ______
 3508  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 3599      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 3600                                                      ~~~^^^^^
 3601: TypeError: 'Period' object is not iterable
 3602  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_int_key[3-nan-iloc] ______
 3603  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 3694      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 3695                                                      ~~~^^^^^
 3696: TypeError: 'Period' object is not iterable
 3697  __ ERROR at setup of TestSetitemNAPeriodDtype.test_int_key[key1-None-setitem] __
 3698  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 4359      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 4360                                                      ~~~^^^^^
 4361: TypeError: 'Period' object is not iterable
 4362  ____ ERROR at setup of TestSetitemNAPeriodDtype.test_slice_key[3-None-loc] _____
 4363  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 4454      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 4455                                                      ~~~^^^^^
 4456: TypeError: 'Period' object is not iterable
 4457  ____ ERROR at setup of TestSetitemNAPeriodDtype.test_slice_key[3-None-iloc] ____
 4458  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 4549      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 4550                                                      ~~~^^^^^
 4551: TypeError: 'Period' object is not iterable
 4552  ___ ERROR at setup of TestSetitemNAPeriodDtype.test_slice_key[3-nan-setitem] ___
 4553  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 4644      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 4645                                                      ~~~^^^^^
 4646: TypeError: 'Period' object is not iterable
 4647  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_slice_key[3-nan-loc] _____
 4648  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 4739      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 4740                                                      ~~~^^^^^
 4741: TypeError: 'Period' object is not iterable
 4742  ____ ERROR at setup of TestSetitemNAPeriodDtype.test_slice_key[3-nan-iloc] _____
 4743  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 4834      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 4835                                                      ~~~^^^^^
 4836: TypeError: 'Period' object is not iterable
 4837  _ ERROR at setup of TestSetitemNAPeriodDtype.test_slice_key[key1-None-setitem] _
 4838  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 5499      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 5500                                                      ~~~^^^^^
 5501: TypeError: 'Period' object is not iterable
 5502  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_mask_key[3-None-loc] _____
 5503  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 5594      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 5595                                                      ~~~^^^^^
 5596: TypeError: 'Period' object is not iterable
 5597  ____ ERROR at setup of TestSetitemNAPeriodDtype.test_mask_key[3-None-iloc] _____
 5598  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 5689      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 5690                                                      ~~~^^^^^
 5691: TypeError: 'Period' object is not iterable
 5692  ___ ERROR at setup of TestSetitemNAPeriodDtype.test_mask_key[3-nan-setitem] ____
 5693  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 5784      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 5785                                                      ~~~^^^^^
 5786: TypeError: 'Period' object is not iterable
 5787  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_mask_key[3-nan-loc] ______
 5788  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 5879      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 5880                                                      ~~~^^^^^
 5881: TypeError: 'Period' object is not iterable
 5882  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_mask_key[3-nan-iloc] _____
 5883  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 5974      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 5975                                                      ~~~^^^^^
 5976: TypeError: 'Period' object is not iterable
 5977  _ ERROR at setup of TestSetitemNAPeriodDtype.test_mask_key[key1-None-setitem] __
 5978  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 6639      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 6640                                                      ~~~^^^^^
 6641: TypeError: 'Period' object is not iterable
 6642  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_series_where[3-nan] ______
 6643  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 6734      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 6735                                                      ~~~^^^^^
 6736: TypeError: 'Period' object is not iterable
 6737  ___ ERROR at setup of TestSetitemNAPeriodDtype.test_series_where[key1-None] ____
 6738  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 7019      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 7020                                                      ~~~^^^^^
 7021: TypeError: 'Period' object is not iterable
 7022  ______ ERROR at setup of TestSetitemNAPeriodDtype.test_index_where[3-nan] ______
 7023  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 7114      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 7115                                                      ~~~^^^^^
 7116: TypeError: 'Period' object is not iterable
 7117  ____ ERROR at setup of TestSetitemNAPeriodDtype.test_index_where[key1-None] ____
 7118  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 7399      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 7400                                                      ~~~^^^^^
 7401: TypeError: 'Period' object is not iterable
 7402  _____ ERROR at setup of TestSetitemNAPeriodDtype.test_index_putmask[3-nan] _____
 7403  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python
 ....
 7494      assert exp[key] is NaT or all(x is NaT for x in exp[key])
 7495                                                      ~~~^^^^^
 7496: TypeError: 'Period' object is not iterable
 7497  ___ ERROR at setup of TestSetitemNAPeriodDtype.test_index_putmask[key1-None] ___
 7498  [gw4] linux -- Python 3.13.5 /raid/pgali/envs/cudfdev/bin/python

Expected behavior
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[mroeschke]

I think all(x is NaT for x in exp[key]) is probably a typo/error in the pandas test; it should probably read all(x is NaT for x in exp). pandas.Periods are not iterable as well

Additionally, I think exp[key] is NaT was suppose to be hit, but this test does some private mutation of underlying data

exp._values.view("i8")[key] = NaT._value

[mroeschke]

I opened pandas-dev/pandas#63069 on the pandas side to fix the assertion.

[galipremsagar]

I opened pandas-dev/pandas#63069 on the pandas side to fix the assertion.

Thank you @mroeschke !