烧瓶文件操作

Question

我试图弄清楚如何打开，操作和重新保存一个上传的文件在烧瓶。我已经得到它，所以我可以上传文件，但打开它，并做我想要的数据是不会发生的。

这是我拥有的..。

with open(os.path.join(app.config['UPLOAD_FOLDER'], filename), 'r') as f:
    content = f.read()
    with open(os.path.join(app.config['UPLOAD_FOLDER'], filename), 'wb') as outputFile:
        outputFile.write(content.lower())
        outputFile.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))

这是整个app.py文件..。

import os
from flask import *
from werkzeug import secure_filename

# Initialize the Flask application
app = Flask(__name__)
app.secret_key = '1234'

app.config['UPLOAD_FOLDER'] = 'uploads/'
app.config['ALLOWED_EXTENSIONS'] = set(['txt'])

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1] in app.config['ALLOWED_EXTENSIONS']

@app.route('/')
def index():
    return render_template('index.html')

# Route that will process the file upload
@app.route('/upload', methods=['POST'])
def upload():
    # Get the name of the uploaded file
    file = request.files['file']
    # Check if the file is one of the allowed types/extensions
    if file and allowed_file(file.filename):
        # Make the filename safe, remove unsupported chars
        filename = secure_filename(file.filename)

        file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
        # Redirect the user to the uploaded_file route, which
        # will basicaly show on the browser the uploaded file

        with open(os.path.join(app.config['UPLOAD_FOLDER'], filename), 'r') as f:
            content = f.read()
            with open(os.path.join(app.config['UPLOAD_FOLDER'], filename), 'wb') as outputFile:
                    outputFile.write(content.lower())
                    outputFile.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))

    return redirect(url_for('uploaded_file', filename=filename))

@app.route('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)


if __name__ == '__main__':
    app.run(debug=True)

提前感谢！

Answer 1

您已经嵌套了语句，您在外部语句中打开的文件需要先关闭，然后才能再次打开它以便写入：

with open(os.path.join(app.config['UPLOAD_FOLDER'], filename), 'r') as f:
    content = f.read()

# At this point, the file is closed
with open(os.path.join(app.config['UPLOAD_FOLDER'], filename), 'wb') as output:
    # do stuff

您也不需要保存它，因为一旦执行循环正文中的所有语句，循环将关闭(即保存并写入磁盘)文件。