先上题:写出最终打印的结果
a = [1, 2, 3, 4]
for x in a:
a.remove(x)
print(a)
print("=" * 20)
b = [1, 2, 3, 4]
for i in b:
b.pop()
print(b)
print("=" * 20)
c = [1, 2, 3, 4]
for i in range(len(c)):
del c[0]
print(c)
a = [1, 2, 3, 4]
for x in a
阅读背景：
Python中remove,pop,del的区别
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