Strip carriage returns / line feeds from database records before they are written to csv

See more:

SQL

CSV

Python2.7

I have the following code that reads lines from a database and writes the matching results to a csv file. The problem I am running into is there are occasionally carriage returns / line feeds in some of the fields in different rows which cause the csv file to be unusable because there are bogus rows.

For example, here is a sample of what happens when there are carriage returns / line feeds in the SQL data and the affect it has on the file. ... Sample content of messed up file:

field1|field2|field3|field4|field5
value 1|value 2|value 3|value 4|value 5
value 1|value 2|value 3|value 4|value 5
value 1|value 2|val
ue 3|value 4|value 5
value 1|value 2|value 3|va
lue 4|value 5


Here is the code that writes the results of a SQL query to the output file. What I am trying to do is strip any results that have carriage returns / line feeds.

<pre lang="vb">'''
    While loop to read each row.  if compares row[2] (updated) against the last record processed
    '''
    latest = params #Declare 'latest' variable for consumption by while loop
    while row:
        if row[2] > latest:
            latest = row[2]
        logger.debug("[%s] - Writing row %s", correlationId, row)
        writer.writerow(row)
        row = cursor.fetchone()

    logger.info("[%s] - last letter date %s " % (correlationId, lastProcessed))
    lastProcessedLog = open(LAST_PROCESSED_LOGFILE , 'wt')
    lastProcessedString = str(latest)
    lastProcessedString = lastProcessedString[0:19]
    lastProcessedLog.write(lastProcessedString)
    lastProcessedLog.close()

    conn.close()
    ofile.close()
    logger.info("[%s] - Copying %s to root for loadBackflow as %s", correlationId, writeFile, outfile)
    shutil.copyfile(writeFile, outfile)
    logger.info("[%s] - Moving %s to completion folder %s", correlationId, writeFile, completionFolder)
    shutil.move(writeFile, completionFolder)

I have tried changing the writer.write(row) line to include a replace but I get an error. Similarly, I get errors when trying to use replace with row = row.replace("\r\n", "") ... I have pasted my attempts and the corresponding errors below.

Any insights on how I can strip carriage returns / line feeds at the time they are being read from the SQL query results into the data file are much appreciated.

Thanks in advance! :)

# Attempt1:
writer.writerow(row).replace("\r\n", "")
# Error:
Unexpected error: 'NoneType' object has no attribute 'replace'

# Attempt2:
row = row.replace("\r\n", "")
#Error:
Unexpected error: 'tuple' object has no attribute 'replace'

#Attempt3:
row = row.replace("\r", "")
row = row.replace("\n", "")
#Error:
Unexpected error: 'tuple' object has no attribute 'replace'

#Attempt 4:
        '''
        While loop to read each row.  if compares row[2] (updated) against the last record processed
        '''
        latest = params #Declare 'latest' variable for consumption by while loop
        def preprocess_item(item):
            if isinstance(item, str):
                return item.replace("\r\n", "")
                #return item.replace("\n", "").replace("\r", "")
            return item

        def preprocess_row(row):
            return tuple(preprocess_item(item) for item in row)

        while row:
            if row[2] > latest:
                #row = cursor.fetchone()
                
                latest = row[2]
            logger.debug("[%s] - Writing row %s", correlationId, row)
            row = cursor.fetchone()
            row = preprocess_row(row)
            writer.writerow(row)