我想创建每月天数列表每年列表的嵌套列表:
[[ 31, 29, 31, 30 ], [ 31, 28, 31, 30 ] ]
with
mm = [ 1, 2, 3, 4 ]
yy = [ 2012, 2013 ]
但我的代码:
[ [ result.append( calendar.monthrange( y, m )[ 1 ] ) for m in mm] for y in yy ]
产生:
[31, 29, 31, 30, 31, 28, 31, 30 ]
有人可以告诉我我做错了什么吗?谢谢。 BSL