删除列表多个元素

a=[1,20,30,'',None,'','',None,10,'','']
c=['',None]
b=['10,20,200','2,40',4]

#方法一
for i in a:
    for j in c:
        if j in a:
            a.remove(j)
print(a)

#方法二
for i in c:
    while i in a:
        a.remove(i)
print(a)
d=[]
for j in b:
    if ',' in str(j):
        s=j.split(',')
        d.extend(s)
    else:
        d.extend(str(j))
print(sorted(d))
d=list(map(int,d))#转数字
print(d)
# e=['200', '10', '40', '2', '200', '4']
# print(sorted(e))a=[1,20,30,'',None,'','',None,10,'','']
c=['',N