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### Pandas version checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/i…
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### Pandas version checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/i…
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### What happened?
Computing the `max` or the `isnull` on a DataArray with bfloat16 values raises a:
`TypeError: dtype argument must be a NumPy dtype, but it is a .`
This worked fine before updat…
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#### Code Sample, a copy-pastable example if possible
Python 2.7.12
```python
## !pip2 install numexpr --user
import pandas as pd
dfc = pd.DataFrame(map(str,range(10)),columns=['colA'])
dfc.…
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It appears that neither the `formatters` nor `float_format` arguments to `DataFrame.to_latex` work if changed from their default values. Both raise the same exception: `AttributeError: 'numpy.float64'…
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###
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pan…
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### Pandas version checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsn…
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#### Code Sample, a copy-pastable example if possible
```python
# Your code here
import pandas as pd
a = pd.Series([1e5, 0, 0, 0, 0])
b = pd.Series([9.45] * 5)
c1 = a.rolling(5).corr(b).iloc[4…
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### Pandas version checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsn…
-
- [x] I have checked that this issue has not already been reported.
- [x] I have confirmed this bug exists on the latest version of pandas.
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#### Code Sample
```python
import pandas as p…