Python pandas several methods for obtaining column data and comparison of writing forms

Pandas get column data bits common functions, but there are some things to note in the wording, here to summarize:

Import Pandas as Pddata1 = PD. DataFrame (...) #任意初始化一个列数为3的DataFramedata1. columns=[' A ', ' B ', ' C ']1.data1[' B '] #这里取到第2列 (i.e. column B), the value of the 2.data1.b# effect is the same as 1, Take the 2nd column (that is, column B) #这里b为列名称, but must be a contiguous string and cannot have spaces. If there is a space, only the 1th method of 1.data1[5:10] #这里取6到11行的所有数据, instead of the column data 2.data_raw_by_tick[2] #非法, return "Keyerror:2"

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Python pandas several methods for obtaining column data and comparison of writing forms