python——for循環嵌套，寫成一個列表生成式(列表生成式中列表嵌套字典)

[{'name1':'Jack'},{'name2':'Lara'}]------>得到[name1, name2]
for循環嵌套，列表生成式寫法：

alist=[{'name1':'Jack'},{'name2':'Lara'}]
b = [j for one in alist for j in one]
print(b)

   for循環嵌套，普通寫法：

alist=[{'name1':'Jack'},{'name2':'Lara'}]
blist=[]
for one in alist:
    for k,v in one.items():
        blist.append(k)
print(blist)

[{'a':'1','b':'11'},{'a':'2','b':'21'},{'a':'3','b':'31'}]------>得到['1', '2', '3']

b = [one.pop('a') for one in alist]
print(b)