元组数组中最常见的值。不区分大小写

from collections import Counter

def most_common_value(tuples):
    # 将所有元素转换为小写并展平列表
    flattened_list = [item.lower() for tup in tuples for item in tup]
    
    # 统计每个元素的出现次数
    counter = Counter(flattened_list)
    
    # 找出出现次数最多的元素及其出现次数
    most_common = counter.most_common(1)[0]
    
    return most_common

# 示例元组数组
tuples = [('Apple', 'banana'), ('apple', 'Banana'), ('cherry', 'Cherry'), ('banana', 'Cherry')]

# 调用函数并打印结果
print(most_common_value(tuples))  # 输出: ('banana', 3)