pyhon 去除重复行

去除重复行

1.

print(''.join(set([x for x in open('cn.txt').readlines() if re.search(r'X.509',x,re.I)])))

2.

print (''.join(set([x for x in open('cn.txt').readlines() if x.strip()!=''])))

3.

print (''.join(set(open('cn.txt').read().split('\n'))))

?

?

截取第二列:

1.

m=''.join(set([x for x in open('cn.txt').readlines() if re.search(r'X.509',x,re.I)]))

print(m.split(',')[1])
CN=ippan

?

2.

print(''.join(set([x for x in open('cn.txt').readlines() if re.search(r'X.509',x,re.I)])).split(',')[1])