熊猫融化了多个价值变量

除了融化之外，您还可以结合使用堆栈和取消堆栈：

(df.set_index(['Country', 'Variable'])   .rename_axis(['Year'], axis=1)   .stack()   .unstack('Variable')   .reset_index())Variable    Country  Year  var1  var20         Argentina  2000    12     11         Argentina  2001    15     32         Argentina  2002    18     23         Argentina  2003    17     54         Argentina  2004    23     75         Argentina  2005    29     56 Brazil  2000    20     07 Brazil  2001    23     18 Brazil  2002    25     29 Brazil  2003    29     210Brazil  2004    31     311Brazil  2005    32     3