如何判断一个列表中的字段

10

['895.32MB'], ['594.82MB'], ['574.6MB'], ['216.71MB'], ['433.9MB'], ['1.51GB'], ['142.15MB'], ['187.02MB'], ['2.79GB'], ['964.45MB'], ['240.38MB'], ['1.13GB'], ['48.94MB'], ['847.99MB'], ['253.26MB'], ['2.15GB'], ['73.16MB'], ['310.97MB'], ['684.72MB'], ['157.41MB'], ['2.07GB'], ['770.88MB'], ['387.66MB'], ['979.39MB'], ['2.33GB'], ['583.22MB'], ['3.37GB'], ['2.74GB'], ['1.74GB'], ['1.46GB']]

获取一个文件容量列表后，如何判断哪个是大于2GB的，并输出列表位置