python——for循环嵌套，写成一个列表生成式，列表生成式中列表嵌套字典

[{'name1':'Jack'},{'name2':'Lara'}]------>得到[name1, name2]
for循环嵌套，列表生成式写法：

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

for循环嵌套，普通写法：

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)