我先检查文件是否为空：
import os
scores = {} # scores is an empty dict already
if os.path.getsize(target) > 0:
with open(target, "rb") as f:
unpickler = pickle.Unpickler(f)
# if file is not empty scores will be equal
# to the value unpickled
scores = unpickler.load()
而且open(target, 'a').close()在您的代码中什么也没做，您不需要使用;。
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