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Editorial Team
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Asked: 2026-06-17T02:59:53+00:00

I have a huge text file with below format (as an ASCII file). I

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I have a huge text file with below format (as an ASCII file). I am using python for processing the same. For this kind of files, I have few questions (in more generic way).

  1. How do I check the correctness of the data format? Is there a way to specify a template and then verify the correctness for such text files? (similar to a dtd file of an xml).
  2. Second question is parsing such file and reading data from the file. Like I expect XYZ data to come after the time row and would need to parse them. Any simple mechanism for such scenarios? Again like a template and parse mechanism.
===========================BEGIN=========================================  
2012-12-05  12:03  
XYZ 123(0)  654(2)  232(4)  
MON  23(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================  
===========================BEGIN=========================================  
2012-12-05  12:04  
XYZ 123(0)  654(2)  232(4)  
MON  23(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================  
===========================BEGIN=========================================  
2012-12-05  12:05  
XYZ 523(0)  654(2)  235(4)  
MON  83(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================  
===========================BEGIN=========================================  
2012-12-05  12:03  
XYZ 193(0)  644(2)  232(4)  
MON  23(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================
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1 Answer

  1. Editorial Team

    You could try a variation of the following :-

    import re
s = '''===========================BEGIN=========================================  
2012-12-05  12:03  
XYZ 123(0)  654(2)  232(4)  
MON  23(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================  
===========================BEGIN=========================================  
2012-12-05  12:04  
XYZ 123(0)  654(2)  232(4)  
MON  23(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================  
===========================BEGIN=========================================  
2012-12-05  12:05  
XYZ 523(0)  654(2)  235(4)  
MON  83(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================  
===========================BEGIN=========================================  
2012-12-05  12:03  
XYZ 193(0)  644(2)  232(4)  
MON  23(0)   54(2)   32(4)  
POR  13(0)   64(1)   92(2)  
=========================== END =========================================
'''
print re.findall(r'=+BEGIN=+\s+(\d+-\d+-\d+\s+\d+:\d+)\s+(((XYZ|MON|POR).*\s+){3})', s)

    This prints :-

    [('2012-12-05  12:03', 'XYZ 123(0)  654(2)  232(4)  \nMON  23(0)   54(2)   32(4)  \nPOR  13(0)   64(1)   92(2)  \n'), 
 ('2012-12-05  12:04', 'XYZ 123(0)  654(2) 232(4)  \nMON  23(0)   54(2)   32(4)  \nPOR  13(0)   64(1)   92(2)  \n'), 
 ('2012-12-05  12:05', 'XYZ 523(0)  654(2)  235(4)  \nMON  83(0)   54(2)   32(4)  \nPOR  13(0)   64(1)   92(2)  \n'), 
 ('2012-12-05  12:03', 'XYZ 193(0)  644(2)  232(4)  \nMON  23(0)   54(2)   32(4)  \nPOR  13(0)   64(1)   92(2)  \n')]
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