python - 如何从文件中打印与大文本文件中的输入字符串匹配的特定行？

Question

这是我的代码，我的目标是从大文本文件打印特定的整行，当我尝试在对象中打印时，字符串等于“SAMPLE TYPE” 如何从整个文件打印指定的行

import re
target = open("debug.txt", "r")
for line in target:
    search=re.search("[SAMPLE TYPE]",line)
    v1=search
    print v1

给出输出:

None
None
None
None
None
<_sre.SRE_Match object at 0x7f870b7d5578>in this place instead of this i need to print the specifed line and i dont want the lines which doesnt contain specifed string.

我的输入文件数据:

HLS| 04/14/16 17:56:58:933 |hls_tsr_module.cpp|ReceiveData              |418 |DEBUG: Data copied to TSD from TSR is 0
HLS| 04/14/16 17:56:58:933 |mpm_h264.cpp   |FrameType                |1341|DEBUG: AU_DELIM NALU Unit Type
HLS| 04/14/16 17:56:58:933 |mpm_h264.cpp   |FrameType                |1341|DEBUG: SEI NALU Unit Type
HLS| 04/14/16 17:56:58:933 |mpm_h264.cpp   |FrameType                |1341|DEBUG: NON_IDR_PICTURE NALU Unit Type
HLS| 04/14/16 17:56:58:933 |mpm_h264.cpp   |FrameType                |1377|DEBUG: B Frame Received
HLS| 04/14/16 17:56:58:933 |hls_tsd_module.cpp|ProcessVideoBuffer       |4151|DEBUG: SAMPLE TYPE: B - FRAME PTS: 8573002542 DTS: 8573002542 
HLS| 04/14/16 17:56:58:933 |hls_tsd_module.cpp|ProcessVideoBuffer       |4193|DEBUG: Video send pts 8573002542
HLS| 04/14/16 17:56:58:933 |hls_tsm_module.cpp|AlternateFrameInterLeave |11770|DEBUG: Audio Record Status is 1
HLS| 04/14/16 17:56:58:934 |hls_tsd_module.cpp|ProcessVideoBuffer       |4261|DEBUG: Frame video pts 8573004043
HLS| 04/14/16 17:56:58:934 |hls_tsm_module.cpp|AlternateFrameInterLeave |11770|DEBUG: Audio Record Status is 1
HLS| 04/14/16 17:56:58:934 |hls_tsd_module.cpp|SegmentStream            |1597|DEBUG: Not an AV/Subtitle Packet 256
HLS| 04/14/16 17:56:58:934 |mpm_h264.cpp   |FrameType                |1341|DEBUG: AU_DELIM NALU Unit Type
HLS| 04/14/16 17:56:58:934 |mpm_h264.cpp   |FrameType                |1341|DEBUG: SEI NALU Unit Type
HLS| 04/14/16 17:56:58:934 |mpm_h264.cpp   |FrameType                |1341|DEBUG: NON_IDR_PICTURE NALU Unit Type
HLS| 04/14/16 17:56:58:934 |mpm_h264.cpp   |FrameType                |1377|DEBUG: B Frame Received
HLS| 04/14/16 17:56:58:934 |hls_tsd_module.cpp|ProcessVideoBuffer       |4151|DEBUG: SAMPLE TYPE: B - FRAME PTS: 8573004043 DTS: 8573004043 

Answer 1

import os
os.system('grep -rnw "[FOLDER_NAME]" -e "SEARCH_STRING" > OP.txt')