想写成if q[0][0] 在[i for nums_a in q for i in nums_a]中只出现一次怎么写

q=[['0','A'],['2','A']]

if q[0][0] not in [i for nums_a in q for i in nums_a]:#想写成if q[0][0] 在[i for nums_a in q for i in nums_a]中只出现一次怎么写
    print(1)
else:
    print(0)

if len([i for nums_a in q for i in nums_a if i==q[0][0]]) == 1: