Python, copy image urls

import re

inputFile=open('/path/to/file.txt', 'r')
outputFile=open('/path/to/destination/file.txt', 'w')

for line in inputFile:
    matches=re.findall(r'<img[^>]*src="([^"])"[^>]*>', line)
    if type(matches)=str:
        outputFile.write(matches)
        continue
    for match in matches:
        outputFile.write(match)

inputFile.close()
outputFile.close()