Python-如何打开尚未写入磁盘的文件？

Question

I am using a script to strip exif data from uploaded JPGs in Python, before writing them to disk. I'm using Flask, and the file is brought in through requests

file = request.files['file']

strip the exif data, and then save it

f = open(file) 
image = f.read()
f.close()
outputimage = stripExif(image)
f = ('output.jpg', 'w')
f.write(outputimage)
f.close()
f.save(os.path.join(app.config['IMAGE_FOLDER'], filename))

Open isn't working because it only takes a string as an argument, and if I try to just set f=file , it throws an error about tuple objects not having a write attribute. How can I pass the current file into this function before it is read?

Answer 1

file is a FileStorage , described in http://werkzeug.pocoo.org/docs/datastructures/#werkzeug.datastructures.FileStorage

As the doc says, stream represents the stream of data for this file, usually under the form of a pointer to a temporary file, and most function are proxied.

You probably can do something like:

file = request.files['file']
image = file.read()
outputimage = stripExif(image)
f = open(os.path.join(app.config['IMAGE_FOLDER'], 'output.jpg'), 'w')
f.write(outputimage)
f.close()

Answer 2

Try the io package, which has a BufferedReader(), ala:

import io

f = io.BufferedReader(request.files['file'])
...

Answer 3

file = request.files['file']
image = stripExif(file.read())
file.close()
filename = 'whatever' # maybe you want to use request.files['file'].filename
dest_path = os.path.join(app.config['IMAGE_FOLDER'], filename)
with open(dest_path, 'wb') as f:
    f.write(image)