a = [11, 22, 33, 44, 55, 66]
for i in a:
    if i == 33 or i == 44:
        a.remove(i)
print(a) # [11, 22, 44, 55, 66]
边遍历边删除，会漏删，解决方法如下

a = [11, 22, 33, 44, 55, 66]
b = [33, 44]
for i in b:
    a.remove(i)
print(a)
# [11, 22, 55, 66]

a = [11, 22, 33, 44, 55, 66]
for i in a:
    if i == 33 or i == 44:
        a.remove(i)
print(a) # [11, 22, 44, 55, 66]
边遍历边删除，会漏删，解决方法如下

a = [11, 22, 33, 44, 55, 66]
b = [33, 44]
for i in b:
    a.remove(i)
print(a)
# [11, 22, 55, 66]