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Also add file-input example to github-readme #3

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Merged
jbaiter merged 2 commits into from
Mar 22, 2017
Merged

Also add file-input example to github-readme #3

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b1570c3
Also add file-input example to github-readme
juleskers Mar 22, 2017
ba84fa0
Merge branch 'master' into patch-1
jbaiter Mar 22, 2017
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11 changes: 11 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,17 @@ m = Map.from_iter(items, path="/tmp/map.fst")
matches = dict(m['clarence':])
assert matches == {'clarence': 2, 'stevie': 3}

# Create a map from a file input, using generators/yield
# The input file must be sorted on the first column, and look roughly like
# keyA 123
# keyB 456
def file_iterator(fpath):
with open(fpath, 'rt') as fp:
for line in fp:
key, value = line.strip().split()
yield key, int(value)
m = Map.from_iter( file_iterator('/your/input/file/'), '/your/mmapped/output.fst')

# re-open a file you built previously with from_iter()
m = Map(path='/path/to/existing.fst')
```
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