values = []
a = [('SRV', 'CLIENT'),('SRV1', 'CLIENT'),('SRV2', 'CLIENT')]
b = [('SRV', 'CLIENT'),('SRV1', 'CLIENT'),('SRV3', 'CLIENT')]
gap = []
for row in a:
if row[0] not in b:
gap.append(row)
print(gap)
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