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
