我的panda数据框如下所示:
Country Code 1960 1961 1962 1963 1964 1965 1966 1967 1968 ... 2015
ABW 2.615300 2.734390 2.678430 2.929920 2.963250 3.060540 ... 4.349760
AFG 0.249760 0.218480 0.210840 0.217240 0.211410 0.209910 ... 0.671330
ALB NaN NaN NaN NaN NaN NaN NaN NaN NaN ... 1.12214
...
我怎样才能把它转换成如下的样子
Country_Code Year Econometric_Metric
ABW 1960 2.615300
ABW 1961 2.734390
ABW 1962 2.678430
...
ABW 2015 4.349760
AFG 1960 0.249760
AFG 1961 0.218480
AFG 1962 0.210840
...
AFG 2015 0.671330
ALB 1960 NaN
ALB 1961 NaN
ALB 1962 NaN
ALB 2015 1.12214
...
谢谢
我认为需要^{} 和^{} :
或^{} 与^{} :
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