Python，在内存中写入 zip 到文件

Question

如何将内存中的 zipfile 写入文件？

# Create in memory zip and add files
zf = zipfile.ZipFile(StringIO.StringIO(), mode='w',compression=zipfile.ZIP_DEFLATED)
zf.writestr('file1.txt', "hi")
zf.writestr('file2.txt', "hi")

# Need to write it out
f = file("C:/path/my_zip.zip", "w")
f.write(zf)  # what to do here? Also tried f.write(zf.read())

f.close()
zf.close()

Answer 1

StringIO.getvalue返回StringIO的内容：

>>> import StringIO
>>> f = StringIO.StringIO()
>>> f.write('asdf')
>>> f.getvalue()
'asdf'

或者，您可以使用seek 更改文件的位置：

>>> f.read()
''
>>> f.seek(0)
>>> f.read()
'asdf'

尝试以下操作：

mf = StringIO.StringIO()
with zipfile.ZipFile(mf, mode='w', compression=zipfile.ZIP_DEFLATED) as zf:
    zf.writestr('file1.txt', "hi")
    zf.writestr('file2.txt', "hi")

with open("C:/path/my_zip.zip", "wb") as f: # use `wb` mode
    f.write(mf.getvalue())

---

Answer 2

修改 falsetru 对 python3 的回答

1) 使用io.StringIO 而不是StringIO.StringIO

StringIO in python3

2) 使用 b"abc" 代替 "abc" ，或

python 3.5: TypeError: a bytes-like object is required, not 'str' when writing to a file

3) 编码为二进制字符串str.encode(s, "utf-8")

Best way to convert string to bytes in Python 3?

import zipfile
import io
mf = io.BytesIO()

with zipfile.ZipFile(mf, mode="w",compression=zipfile.ZIP_DEFLATED) as zf:

    zf.writestr('file1.txt', b"hi")

    zf.writestr('file2.txt', str.encode("hi"))
    zf.writestr('file3.txt', str.encode("hi",'utf-8'))


with open("a.txt.zip", "wb") as f: # use `wb` mode
    f.write(mf.getvalue())

这也适用于 gzip：How do I gzip compress a string in Python?

Answer 3

  with ZipFile(read_file, 'r') as zipread:
        with ZipFile(file_write_buffer, 'w', ZIP_DEFLATED) as zipwrite:
            for item in zipread.infolist():
                # Copy all ZipInfo attributes for each file since defaults are not preseved
                dest.CRC = item.CRC
                dest.date_time = item.date_time
                dest.create_system = item.create_system
                dest.compress_type = item.compress_type
                dest.external_attr = item.external_attr
                dest.compress_size = item.compress_size
                dest.file_size = item.file_size
                dest.header_offset = item.header_offset

如果 zip 文件读取损坏并且您注意到缺少符号链接或时间戳错误的文件损坏，则可能是文件属性没有被复制。

上面的代码sn-p就是我解决问题的方法。