pandas.errors.MergeError#
- exceptionpandas.errors.MergeError[source]#
Exception raised when merging data.
Subclass of
ValueError.Examples
>>>left=pd.DataFrame({"a":["a","b","b","d"],..."b":["cat","dog","weasel","horse"]},...index=range(4))>>>right=pd.DataFrame({"a":["a","b","c","d"],..."c":["meow","bark","chirp","nay"]},...index=range(4)).set_index("a")>>>left.join(right,on="a",validate="one_to_one",)Traceback (most recent call last):MergeError:Merge keys are not unique in left dataset; not a one-to-one merge
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