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Python is a dynamically typed programming language designed by Guido van Rossum. Much like the programming language Ruby, Python was designed to be easily read by programmers. Because of its large following and many libraries, Python can be implemented and used to do anything from webpages to scientific research.
3.9-dev.
While I’m not sure we should officially support Python 3.9 it until its release, running tests on it will allow us to catch any issue early.
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enhancement
good first issue
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df = DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})
df.groupby([1, 1], axis=1).transform("shift")
results in ValueError: Length mismatch: Expected axis has 2 elements, new values have 3 elements.
I think the issue is in pandas.core.groupby.generic._wrap_transformed_output; this method does not take into account `s
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Bug
Groupby
good first issue
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