Pythonでシリアライズ

ちょっとした設定や計算の途中結果を一時保存するには便利な環境。

■marshalを使う

import os,marshal

def writedump():
    data1 = range(1,100,2)
    data2 = ['hori','suzuki','yamada']
    with open('datafile.dat','wb') as outfile:
        marshal.dump(data1,outfile)
        marshal.dump(data2,outfile)
def readdump():
    with open('datafile.dat','rb') as infile:
        print "1:" + str(marshal.load(infile))
        print "2:" + str(marshal.load(infile))
def main():
    writedump():
    readdump()

if __name__ == '__main__':
    main()


■cPickleを使う


import os,cPickle

def writedump():
    data1 = '0'*100000
    data2 = ['hori','suzuki','yamada']
    with open('datafile_pickle.dat','wb') as outfile:
        cPickle.dump(obj = data1,file = outfile, protocol = 2)
        cPickle.dump(obj = data2,file = outfile, protocol = 2)
def readdump():
    with open('datafile_pickle.dat','rb') as infile:
        print "1:" + str(cPickle.load(infile))
        print "2:" + str(cPickle.load(infile))
def main():
    writedump()
    readdump()

if __name__ == '__main__':
    main()

■さらにZip圧縮する


import os,cPickle,gzip

def writedump():
    data1 = '0'*100000
    data2 = ['hori','suzuki','yamada']
    outfile = gzip.open('datafile_pickle_zip.zip','wb')
    cPickle.dump(obj = data1,file = outfile, protocol = 2)
    cPickle.dump(obj = data2,file = outfile, protocol = 2)
    outfile.close()
def readdump():
    infile = gzip.open('datafile_pickle_zip.zip','rb')
    print "1:" + str(cPickle.load(infile))
    print "2:" + str(cPickle.load(infile))
    infile.close()
def main():
    writedump()
    readdump()

if __name__ == '__main__':
    main()