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pd merge_asof

>>> left = pd.DataFrame({"a": [1, 5, 10], "left_val": ["a", "b", "c"]})
>>> left
    a left_val
0   1        a
1   5        b
2  10        c

>>> right = pd.DataFrame({"a": [1, 2, 3, 6, 7], "right_val": [1, 2, 3, 6, 7]})
>>> right
   a  right_val
0  1          1
1  2          2
2  3          3
3  6          6
4  7          7

>>> pd.merge_asof(left, right, on="a")
    a left_val  right_val
0   1        a          1
1   5        b          3
2  10        c          7

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pd merge_asof

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