Check if a file already exists in a particular folder [duplicate]

_x000D_ _x000D_ _x000D_ This question already has an answer here:_x000D_ _x000D_ _x000D_ How can I safely create a nested directory?_x000D_ _x000D_ 25 answers_x000D_ _x000D_ _x000D_ _x000D_ Safely create a file if and only if it does not exist with python_x000D_ _x000D_ 3 answers_x000D_ _x000D_ _x000D_ _x000D_ _x000D_ I want, before uploading a file in image folder, to check if the file in the folder already exists or not. If the file already exists it should show a message. from flask import Flask, render_template, request from werkzeug import secure_filename UPLOAD_FOLDER = '/path/to/the/uploads' ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'GIF']) app = Flask(__name__) app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER import os, os.path APP_ROOT = os.path.dirname(os.path.abspath(__file__)) UPLOAD_FOLD = '/python/image/' UPLOAD_FOLDER = os.path.join(APP_ROOT, UPLOAD_FOLD) app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER @app.route('/upload') def load_file(): return render_template('upload.html') @app.route('/uploader', methods = ['GET', 'POST']) def upload_file(): if request.method == 'POST': f = request.files['file'] f.save(os.path.join(app.config['UPLOAD_FOLDER'],secure_filename(f.filename))) return 'file uploaded successfully' if __name__ == '__main__': app.run(debug = True)