使用python 3合并大二进制文件

Question

如何使用python 3将几个大文件合并为1？ 它应该像bash命令一样工作

cat * > outfile

但它应该适用于Linux，Windows和OS X.

如果我使用

outfile = open("outfile", "wb")
for file in os.listdir():
    outfile.write(file.read())

它使用太多RAM

Answer 1

对于大型二进制文件，不是读取行，而是读取磁盘块大小的倍数的块。像（未经测试的）

之类的东西

BLOCKSIZE = 4096  # typical, I believe
BLOCKS = 1024  # somewhat arbitrary
chunk = BLOCKS * BLOCKSIZE
with open("outfile", "wb") as outfile:
    for fname in os.listdir():
        with open('fname', "rb") as infile
            outfile.write(infile.read(chunk))