Patch 7 #2
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Patch 7 #2
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Mater:
```python
In [1]: import pandas as pd; import numpy as np
In [2]: arr = ['s%04d' % i for i in np.random.randint(0, 500000 // 10,
size=500000)];
s = pd.Series(arr).astype('category')
In [3]: %timeit s.cat.set_categories(s.cat.categories)
68.5 ms ± 846 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
```
HEAD:
```python
In [1]: import pandas as pd; import numpy as np
In [2]: arr = ['s%04d' % i for i in np.random.randint(0, 500000 // 10,
size=500000)]
s = pd.Series(arr).astype('category')
In [3]: %timeit s.cat.set_categories(s.cat.categories)
7.43 ms ± 110 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
```
Closes pandas-dev#17508
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git diff upstream/master -u -- "*.py" | flake8 --diff