这是使用Python中的基本文件操作的方法。这将打开一个文件，将数据读入内存，然后打开第二个文件并将其写出。
in_file = open("in-file", "rb") # opening for [r]eading as [b]inary
data = in_file.read() # if you only wanted to read 512 bytes, do .read(512)
in_file.close()
out_file = open("out-file", "wb") # open for [w]riting as [b]inary
out_file.write(data)
out_file.close()
通过使用with键盘处理关闭文件，我们可以更简洁地执行此操作。
with open("in-file", "rb") as in_file, open("out-file", "wb") as out_file:
out_file.write(in_file.read())
如果您不想将整个文件存储在内存中，则可以分段传输。
piece_size = 4096 # 4 KiB
with open("in-file", "rb") as in_file, open("out-file", "wb") as out_file:
while True:
piece = in_file.read(piece_size)
if piece == "":
break # end of file
out_file.write(piece)
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