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import urllib.request

url = "https://cdn-ak.f.st-hatena.com/images/fotolife/e/esakun/20150730/20150730215258.gif"
savename = "test.png"
memory = urllib.request.urlopen(url).read();

# w・・・書き込み
# b・・・バイナリ
# wbとはバイナリ書き込みを意味する
with open(savename, mode="wb") as f:
    f.write(memory)
    print("save complete")