flask to write data into file

Question

I have problem to write data into file from my flask developments server (win7),

 @app.route('/')
 def main():

    fo = open("test.txt","wb")
    fo.write("This is Test Data")

 return render_template('index.html')

Why this don't works in flask ?

Answer 1

You should either flush the output to the file or close the file because the data may still be present in the I/O buffer.

Even better use the with statement as it'll automatically close the file for you.

with open("test.txt", "w") as fo:
   fo.write("This is Test Data")