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mention progress bar usage of read_root in README #76

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Oct 29, 2018
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mention progress bar usage of read_root in README #76

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13 changes: 13 additions & 0 deletions README.md
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Expand Up @@ -93,6 +93,19 @@ parts of a single large `DataFrame`.

You can also combine any of the above options at the same time.

Reading in chunks also supports progress bars
```python
from progressbar import ProgressBar
pbar = ProgressBar()
for df in pbar(read_root('bigfile.root', chunksize=100000)):
# process df here

# or
from tqdm import tqdm
for df in tqdm(read_root('bigfile.root', chunksize=100000), unit="chunks"):
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Just changing this to be consistent (and trying out the GitHub suggestion feature).

Suggested change
for df in tqdm(read_root('bigfile.root', chunksize=100000), unit="chunks"):
for df in tqdm(read_root('bigfile.root', chunksize=100000), unit='chunks'):

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As I don't have permission to push to this branch I'll merge and apply the suggestion manually.

Thanks for the PR 👍

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oh, i just clicked apply to see if it works

# process df here
```

## Writing ROOT files

`root_pandas` patches the pandas DataFrame to have a `to_root` method that allows you to save it into a ROOT file:
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