如何使用Python3读取多行输入作为单个输入？

Question

输入文件：

>sp|P31946|1433B_HUMAN 14-3-3 protein beta/alpha OS=Homo sapiens GN=YWHAB PE=3 SV=3
MTMDKSELVQKAKLAEQAERYDDMAAAMKAVTEQGHELSNEERNLLSVAYKNVVGARRSS
WRVISSIEQKTERNEKKQQMGKEYREKIEAELQDICNDVLELLDKYLIPNATQPESKVFY
>sp|P62258|1433E_HUMAN 14-3-3 protein epsilon OS=Homo sapiens GN=YWHAE PE=1 SV=1
MDDREDLVYQAKLAEQAERYDEMVESMKKVAGMDVELTVEERNLLSVAYKNVIGARRASW
RIISSIEQKEENKGGEDKLKMIREYRQMVETELKLICCDILDVLDKHLIPAANTGESKVF

预期产出：

  

sp | P62258 | 1433E_HUMAN 14-3-3 protein epsilon OS = Homo sapiens GN = YWHAE PE = 1 SV = 1       MDDREDLVYQAKLAEQAERYDEMVESMKKVAGMDVELTVEERNLLSVAYKNVIGARRASW       RIISSIEQKEENKGGEDKLKMIREYRQMVETELKLICCDILDVLDKHLIPAANTGESKVF

到目前为止编写的代码：

#!/usr/bin/python

import re

fh = open("test_seq")
for line in fh:
    if line.startswith('>'):
        if re.search('PE=1',line):
             print line

Answer 1

将这些线附加在一起然后它们将作为单个字符串运行。

Answer 2

怎么样：

with open("test_seq", 'rb') as fh: 
    print_line = False
    for line in fh:
        if line.startswith('>'):
            if re.search('PE=1',line):
                print_line = True
            else:
                print_line = False
        if print_line:
            print line