Pythonあれこれ/ファイルダウンロード

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import sys
import os
 
class DownloadFile:
    def do(self, file):
        
        sys.stdout.write("Content-Type: application/octet-stream\n")
        sys.stdout.write("Content-Disposition: attachment; filename=\"" + os.path.basename(file) + "\"\n")
        sys.stdout.write("Content-Length: " + str(os.path.getsize(file)) + "\n")
        sys.stdout.write("Expires: 0\n")
        sys.stdout.write("Cache-Control: must-revalidate, post-check=0,pre-check=0\n")
        sys.stdout.write("Pragma: private\n")
        sys.stdout.write("\n")
 
        if sys.platform == "win32":
            import msvcrt
            msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
        
        myfile = open(file,'rb')
        sys.stdout.write(myfile.read())
        myfile.close()
        
 
r = DownloadFile()
r.do('c:\\okinawa.csv')