How to read a text file using text mode without decompressing using the `zipfile` module?

Question

The Python version I am using is 3.5.2. I try to use the zipfile module’s zipfile.ZipFile.open method to open a text file in a compressed package. Even if the rU parameter required in the document is used, it is still opened in binary data format, which is puzzling.

Code:

>>> import zipfile
>>> zf = zipfile.ZipFile('/Users/chiqingjun/Downloads/top-1m.csv.zip')
>>> zf.namelist()
['top-1m.csv']
>>> f = zf.open(zf.namelist()[0], mode='rU')
>>> f
<zipfile.ZipExtFile name='top-1m.csv' mode='rU' compress_type=deflate>
>>> f.readline()
b'1,google.com\n'
# 仍然是二进制数据

Official documentation (version 3.5.2):

Answer 1

In fact, the final output binary has nothing to do with zipfile, ​​but is related to py3.5. You can decode the output result to get the character type

content = f.readline()
print(content.decode('utf8'))

Answer 2

The documentation has said that rU is the universal newline character, and this mode will be removed in 3.6.

It is necessary to read the byte content of compressed files in binary. How to transcode later is decided by the programmer.