python 2.7 - tempfile object skips lines in for loop -


i read data csv file, perform normalization on each row , write temp file. temp file object created in main() function code in 1 file writes , code in file reads it. avoid importing large files memory.

however, following script writes subset of rows file. when replace temp_file.write(row) print statement rows printed stdout.

can me understand why print returns rows subset written temp file.

update: added normalize() method main() method , results correct. suspect issue passing tempfile object name python file , writing file.

main method

def main():      [argparse code here - removed brevity]      temp_file = namedtemporaryfile()      if os.path.isfile(args.input_file):         normalize.normalize_file(args.input_file, temp_file)     else:         print 'please supply valid source file'         if __name__ == '__main__':         main()

method imported file

def normalize_file(csv_file, temp_file):      open(csv_file) file:         reader = csv.reader(file)         line in file:             row = line.lower()             matchstr = re.search(r'\\users\\\w+\\',row, re.i)             if matchstr:                 row = row.replace(matchstr.group(), '\\users\\usr\\')             matchstr = re.search(r'\w:\\',row, re.i)             if matchstr:                 row = row.replace(matchstr.group(), '\\')             temp_file.write(row)             #if put print here rows printed out correctly


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