摘要:
'''
shelve模块:
映射容器
存储对象,被存储的对象都会被序列化并且被写入文件
反序列化然后从文件获取任意对象
method:shelve.open()
'r' Open existing database for reading only (default)
'w' Open existing database for reading and writing
'c' Open database for reading and writing, creating it if it doesn’t exist
'n' Always create a new, empty database, open for reading and writing
'''
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