Flask console log

from __future__ import print_function # In python 2.7
import sys

@app.route('/button/')
def button_clicked():
    print('Hello world!', file=sys.stderr)
    return redirect('/')

Source: stackoverflow.com

Flask print to console

import sys

print('This is error output', file=sys.stderr)
print('This is standard output', file=sys.stdout)

Source: stackoverflow.com

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