How to realize horizontal connection with concat function in pandas

This article is about how the concat function in pandas implements horizontal concatenation. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

transverse connecting

In [10]: pd.concat([df1, df2], axis=1)Out[10]: letter number letter number0 a 1 c 31 b 2 d 4

By default, concat is union, and if one of the two pieces of data does not have a corresponding row or column, it will be filled with a null value NaN.

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