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import re
import sys

def main():
    with open("testdata2.txt", "r") as inputFile:
        # This is the aSN code provided as the command line argument
        asnInputValue = sys.argv[1]
        
        # Each line including the user name starts with "user" followed
        # by something (that is, the actual user name), therefore the 
        # following regular expression pattern may be used in order to 
        # detect such line
        userNameProg = re.compile(r"\"user\"[ ]+\"(?P<userName>[^ \"]+)\"")
        
        # The regular expression matching the aSN code
        asnProg = re.compile(r"\"aSN\"[ ]*=[ ]*\"(?P<asnValue>[^ \"]+)\"")
        
        # start reading the file, line by line and looking for the 
        # corresponding matched regular expressions for user name and aSN.
        userName = None
        asnCode = None
        for line in inputFile:
            # user name found in the current line being processed
            userNameMatched = userNameProg.match(line)
            # aSN code  found in the current line being processed
            asnMatched = asnProg.match(line)
            
            if userNameMatched:
                userName = userNameMatched.group("userName")
            elif asnMatched:
                asnCode = asnMatched.group("asnValue")
                if asnCode == asnInputValue:
                    print ("The user name for the aSN code {0} is {1}".
                        format(asnCode, userName))
            else:
                continue
    
main()

"user" "test1" 
{
"name" = "test1"
"princName" = "test1@local"
"cn" = "test1"
"ID" = 12345
"aSN" = "TRI1"
}

"user" "test2" 
{
"cn" = "test2"
"sAmname" = "test2"
"email" = "test2@corp.com"
"ID" = 422223
"aSN" = "TRI2"
}

"user" "test3" 
{
"cn" = "test2"
"sAmname" = "test2"
"email" = "test2@corp.com"
"ID" = 422223
"aSN" = "TRI3"
}

"user" "test4" 
{
"cn" = "test4"
"sAmname" = "test4"
"email" = "test4@corp.com"
"ID" = 422223
"aSN" = "TRI4"
}

$ python -tt myscript.py TRI1
The user name for the aSN code TRI1 is test1

$ python -tt myscript.py TRI2
The user name for the aSN code TRI2 is test2

$ python -tt myscript.py TRI3
The user name for the aSN code TRI3 is test3

$ python -tt myscript.py TRI4
The user name for the aSN code TRI4 is test4