如何在list python中检查列表中的同值

def check_duplicates(lst):
    for item in lst:
        if lst.count(item) > 1:
            return True
    return False

my_list = [1, 2, 3, 4, 2]
result = check_duplicates(my_list)
print(result)  # 输出 True

def check_duplicates(lst):
    return len(lst) != len(set(lst))

my_list = [1, 2, 3, 4, 2]
result = check_duplicates(my_list)
print(result)  # 输出 True

def check_duplicates(lst):
    duplicates = [item for item in lst if lst.count(item) > 1]
    return bool(duplicates)

my_list = [1, 2, 3, 4, 2]
result = check_duplicates(my_list)
print(result)  # 输出 True