bottle: won't start with pythonw

I wrote a simple service, and tried to deploy it on windows. I used pythonw.exe to start the script. But bottle won’t start. The process started and then quickly closed. But if I started it using python.exe, the process works fine. I think this might be a bug. The process won’t start even if I just imported bottle but not doing anything. The code looks like this. pythonw hello_world.py would start, and then quickly shutdown.

'''
hello_world.py
'''
import bottle
import time

if __name__ == '__main__':
    while True:
        print('Hello, world')
        time.sleep(2)

However, python hello_world.py will do the work, and if I comment import bottle out, pythonw will do the job too.

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 19 (3 by maintainers)

Most upvoted comments

Running a server on windows is a pretty common use case for pythonw.exe (the other is GUI apps). So there is good reason to run a bottle application without a console.

You can add:

sys.stdout = open('log.txt', 'w')
sys.stderr = open('err.txt', 'w')

to your app before you import bottle.

For some reason, nothing that gets written to stdout/stderr actually shows up in the files once bottle is imported, but aside from that it seems to work.

nolanl on May 12, 2019

@seth-c-stenzel For it to work, you have to do it in this order:

import sys
sys.stdout = open('stdout.log', 'a+', buffering=1)
sys.stderr = open('stderr.log', 'a+', buffering=1)

import bottle

app = bottle.Bottle()

@app.route('/')
def say_hello():
     return 'Hello, world!'

app.run(port=8888)

Can you confirm it works for you?

josephernest on Jul 26, 2022