kernprof and flask

example.py

"""
Flask's reloader causes kernprof to fail.
Without the reloader it appears to work.
"""

from flask import Flask, request
import time

app = Flask(__name__)
app.testing = True


@app.route('/')
@profile
def index():
    time.sleep(1)
    fn = request.environ.get('werkzeug.server.shutdown')
    if fn:
        fn()
    return 'ok'


if __name__ == '__main__':
    # Fails - "debug" enables the reloader
    # app.run('127.0.0.1', 5000, debug=True)

    # Works - "use_debugger" does not enable the reloader
    # app.run('127.0.0.1', 5000, use_debugger=False)

    # Fails
    # app.run('127.0.0.1', 5000, use_reloader=True)

    # Works
    # app.run('127.0.0.1', 5000, use_reloader=False)

    # Works
    with app.test_client() as c:
        c.get('/')

kernprof -l -v example.py

$ kernprof -l -v example.py
Wrote profile results to example.py.lprof
Timer unit: 1e-06 s

Total time: 1.00117 s
File: example.py
Function: index at line 13

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
    13                                           @app.route('/')
    14                                           @profile
    15                                           def index():
    16         1      1001072 1001072.0    100.0      time.sleep(1)
    17         1           97     97.0      0.0      fn = request.environ.get('werkzeug.server.shutdown')
    18         1            3      3.0      0.0      if fn:
    19                                                   fn()
    20         1            2      2.0      0.0      return 'ok'