Python What is way of Writing a Variable output into a file if a function defined

Question

How to write a variable data info a file in case function is defined. While i'm trying below method but it just write few lines only:

Please let me know what mistake i'm doing here...

fileData = 'ldap_conn_logs'
def ChkCon():
    Flag    = False
    FlagTcp = False
    NewStr  = ''
    OutStr  = ''
    HOST    = ''
    MARKER  = '----------------'
    NEWLINE = '\n'
    with open('ldap_bind_netstat', 'r') as log:
        for line in log:
            if '| SUCCESS |' in line:
                if Flag:
                    return HOST
                    return MARKER
                    return NewStr
            if '| SUCCESS |' in line:
                Flag = False
                FlagTcp = True
                HOST = line.split()[0]
                NewStr = ''
            elif 'FAILED' in line:
                FlagTcp = False
            elif 'UNREACHABLE' in line:
                FlagTcp = False
            if FlagTcp and line.startswith('tcp'):
                NewStr += line
                if 'tsdj-lb-oidc01' not in line:
                    Flag = True
                OutStr = HOST + NEWLINE + MARKER + NEWLINE + NewStr
                fileWrite = open(fileData, mode='a', encoding='utf-8')
                fileWrite.write(OutStr)
                fileWrite.close()
ChkCon()

You are opening the file in "write" mode in the for loop, which will overwrite whatever text you have already written in the file in each iteration of the loop. Please use mode a instead as @Hans suggested.! — Jay Joshi
– Jay Joshi, Commented May 27, 2018 at 8:25
@Vinny .. i have edited the actual code tried, but while doing it it does not write the actual OutStr data into file — krock1516
– krock1516, Commented May 27, 2018 at 11:02

Hans Musgrave · Accepted Answer · 2018-05-27 08:24:21Z

1

As Vinny mentioned, this example is neither complete nor verifiable. My best guess is that you want to replace mode='w+' with mode='a'. You don't seem to be actually reading fileData, so don't bother with the +. Write mode overwrites your file every time you run through the loop.

answered May 27, 2018 at 8:24

Hans Musgrave

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1 Comment

krock1516 Over a year ago

Hans Musgrave, I have edited the real code tried , just to see what wrong i'm doing..

krock1516 · Accepted Answer · 2018-05-29 15:50:29Z

@reculseSoul, Use str.format method and close the fileWrite.close() outside the for loop. Please try below it should work.

def ChkCon():
    Flag    = False
    FlagTcp = False
    NewStr  = ''
    OutStr  = ''
    HOST    = ''
    MARKER  = '----------------'
    NEWLINE = '\n'
    fileData = 'ldap_conn_logs'
    with open('ldap_bind_netstat', 'r') as log:
        for line in log:
            if '| SUCCESS |' in line:
                if Flag:
                    return HOST
                    return MARKER
                    return NewStr
            if '| SUCCESS |' in line:
                Flag = False
                FlagTcp = True
                HOST = line.split()[0]
                NewStr = ''
            elif 'FAILED' in line:
                FlagTcp = False
            elif 'UNREACHABLE' in line:
                FlagTcp = False
            if FlagTcp and line.startswith('tcp'):
                NewStr += line
                if 'tsdj-lb-oidc01' not in line:
                    Flag = True
                OutStr = HOST + NEWLINE + MARKER + NEWLINE + NewStr
                fileWrite = open(fileData, 'w')
                fileWrite.write(OutStr)
                file.write('{0}'.format(OutStr))
        fileWrite.close()
        log.close()
ChkCon()

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