從Django shell上傳圖片

Question

我需要將一堆圖像導入Django應用程序。 我在shell中測試但在嘗試保存圖像時無法通過此錯誤：

File "/lib/python3.3/codecs.py", line 301, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final) 
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: 
invalid start byte

該模型：

import uuid
from django.db import models
from taggit.managers import TaggableManager
import os

def generate_filename(instance, filename):
    f, ext = os.path.splitext(filename)
    name = uuid.uuid4().hex
    return 'images/%s%s' % (name, ext)

class StudyImage(models.Model):

    pic = models.ImageField(upload_to=generate_filename)
    upload_date = models.DateTimeField(auto_now_add=True)
    tags = TaggableManager()

獲取錯誤的步驟：

打開一個django shell。

import uuid
import os
from app import models

p = File(open('/home/image001.png', 'r'))
a = models.StudyImage(pic=p)
a.pic.save('test.jpg',p)

這給出了上面的錯誤。 我無法弄清楚為什么一個圖像給出了unicodecodeerror ...我到目前為止指的是從django shell“上傳”一個文件

更多細節：

Django 1.7，Python 3.3

完全追溯：

Traceback (most recent call last):<br>
File "<input>", line 1, in <module><br>
File "/home/s/Pycharm/flf/venv/lib/python3.3/site-
    packages/django/db/models/fields/files.py", line 89, in save
self.name = self.storage.save(name, content)
File "/home/s/Pycharm/flf/venv/lib/python3.3/site-
    packages/django/core/files/storage.py", line 51, in save
    name = self._save(name, content)
File "/home/s/Pycharm/flf/venv/lib/python3.3/site-
    packages/django/core/files/storage.py", line 224, in _save
    for chunk in content.chunks():
File "/home/s/Pycharm/flf/venv/lib/python3.3/site-packages/django/core/files/base.py",
    line 77, in chunks
    data = self.read(chunk_size)
File "/home/s/Pycharm/flf/venv/lib/python3.3/codecs.py", line 301, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
    UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte

Answer 1

我之前一直都是這樣，所以我覺得你 - 但根據我的評論：在File（）調用中用'rb'替換'r' ，它應該可以正常工作。

對於那些稍后得出這個答案的人，我還應該補充一點，這是Python3特有的問題。 看一下Steve的評論中的SO鏈接，以更全面地解釋p2和p3之間File()差異。