import xlwings as xw
xlapp = xw.App(visible=True, add_book=False)
a = xlapp.api.GetOpenFilename('Excel Files (*.xl*),*.xl*', 0, 0, 0, True)
print(a[0])
slist = []
for i in a:
    wk = xw.Book(i)
    for s in wk.sheets:
        s_dict = {}
        s_dict['工作簿名字'] = wk.name
        s_dict['工作表名字'] = s.name
        slist.append(s_dict)
    wk.close()

slist2 = []
for i in a:
    wk = xw.Book(i)
    slist2 += [{'工作簿名字': i.name, '工作表名字': s.name} for s in wk.sheets]