需求：用 Python 实现将网络图片转成 jpg 格式保存到七牛
代码如下:
res = requests.get(p_img_url)
im = Image.open(BytesIO(res.content)).convert('RGB')
imgByteArr = BytesIO()
im.save(imgByteArr, format='JPEG')
output = imgByteArr.getvalue()
# 构建鉴权对象
q = Auth(QINIU_ACCESS_KEY, QINIU_SECRET_KEY)
token = q.upload_token(QINIU_BUCKET, path_name, 3600)
# 上传到七牛
ret, info = qiniu.put_data(token, path_name, output)
支持转换的图片格式如下（不区分大小写）：
'PCX,ICNS,HDF5,EPS,MSP,XBM,WEBP,BUFR,PPM,SGI,BMP,TGA,ICO,TIFF,JPEG,SPIDER,GIF,GRIB,IM,FITS,PDF,WMF,MPO,PALM,JPEG2000,PNG'
参考链接：
https://blog.csdn.net/wgPython/article/details/80740067
https://github.com/python-pillow/Pillow/issues/3192
https://stackoverflow.com/questions/33101935/convert-pil-image-to-byte-array
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