Convert a string array to csv file

I am wondering how to use numpy convert the arrays below to a csv file

`[array(['1.5',' "school"','100'], dtype='<U8')
 array(['10.0',' -90',' "flower"'], dtype='<U11')]`

which looks like in this format.(with '' deleted)

`1.5, "school", 100
10.0, -90, "flower"`

Which methods should I use to get this?thx.