bins, a convenience for pd.cut, only works with numeric data
dropna : 布尔型,默认为True,表示不包括NaN
2.pandas.DataFrame.count...over requested axis....index=["a","b","c","d"],
columns=["one","two"])
print("df:")
print(df)
#直接使用...index=["a","b","c","d"],
columns=["one","two"])
print("df:")
print(df)
#直接使用...Specify list for multiple sort orders.
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