pandas 如何创建一个动态值的多个变量？

zd287kbt 于 2023-03-11 发布在其他

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我想创建aprox 20图表从1989年到2021年，过滤他们im使用Pandas

year1989 = ven_df['Year'] == '1989'

所以对于变量，我可以将其用作“掩码

ven_df[year1989]

并输出一个 Dataframe ，其中包含1989年的所有值
问题是，他们是这么多年来，我发现非常无用的写同样的代码30次，甚至更多。
我想用一个循环或者一个函数来创建所有的变量：1989年到2021年，值为ven_df [“年”] ==“1989”到ven_df [“年”] ==“2021”。
我的方法是正确的吗？或者有更好的方法，我是Pandas新手，谢谢！

year1989 = ven_df['Year'] == '1989'
year1990 = ven_df['Year'] == '1990'
year1991 = ven_df['Year'] == '1991'
year1992 = ven_df['Year'] == '1992'
year1993 = ven_df['Year'] == '1993'
year1994 = ven_df['Year'] == '1994'
year1995 = ven_df['Year'] == '1995'
year1996 = ven_df['Year'] == '1996'
year1997 = ven_df['Year'] == '1997'
year1998 = ven_df['Year'] == '1998'
year1999 = ven_df['Year'] == '1999'
year2000 = ven_df['Year'] == '2000'
year2001 = ven_df['Year'] == '2001'
year2002 = ven_df['Year'] == '2002'
year2003 = ven_df['Year'] == '2003'
year2000 = ven_df['Year'] == '2004'
year2001 = ven_df['Year'] == '2005'
year2002 = ven_df['Year'] == '2006'
year2003 = ven_df['Year'] == '2007'

等等！我肯定这不是正确的做事方式...

pandas

来源：https://stackoverflow.com/questions/75677162/how-to-create-multiple-variables-with-a-value-thats-dynamic-for-pandas

1条答案

按热度按时间

7rfyedvj1#

masks = {}
for year in range(1989, 2022):
    masks[str(year)] = ven_df['Year'] == str(year)

访问：

ven_df[masks['1995']]

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pandas 如何创建一个动态值的多个变量？

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