##No.1
import re
for line in open("a.txt"):
if not re.match("abcd", line):
print line[:-1] #标准输出比较方便
##No.2
omit = False
for line in open("a.txt"):
if line == "#start\n":
omit = True
elif line == "#end\n":
omit = False
else:
if not omit: print line[:-1]
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