题目要求

对于给定的列表，要求对列表中每个重复元素只输出一次，请补全以下3种去重算法的代码。 测试用例列表：a = [11, 1, 14, 23, 11, 89, 14, 56, 89]

# 方法1
a = [11, 1, 14, 23, 11, 89, 14, 56, 89]
result = []
for i in a:
    if i not in result:
        ①
print("方法1:", result)

# 方法2
a = [11, 1, 14, 23, 11, 89, 14, 56, 89]
for i in [j for j in a if a.count(j) > 1]:
    for x in range(a.count(i) - 1):
        ②
print("方法2:", a)

# 方法3
a = [11, 1, 14, 23, 11, 89, 14, 56, 89]
i = 0
while i <= len(a) - 1:
    if a.count(a[i]) > 1:
        ③
    else:
        ④
print("方法3:", a)