Inspired by the book "Head First Python, 2nd Edition" by Paul Barry, released November 2016, Publisher(s): O'Reilly Media, Inc.
where some examples don't work
Pages 296-300 of that book
Task 4: Create Code to Work with Our Webapp’s Database and Tables
Determine the Flask version.
First way: two lines in
IDLE
import flask
print(flask.__version__)
Second way: one command in Command line:
pip show flask
The installed
Flask version is uptodate -
3.0.3
Determine the Python version.
First way: two lines in
IDLE
from platform import python_version
python_version()
Second way: one command in Command line again:
python -V
The installed
Python version is uptodate too -
3.12.3
Coding in Python, Flask
from flask import Flask
from flask import render_template, request
The method
request.user_agent.browser returns nothing.
The next method requires one more importing
from ua_parser import user_agent_parser
These three lines returns the browser name in browser variable:
web_detail = str(request.user_agent)
user_browser = user_agent_parser.ParseUserAgent(web_detail)
browser = user_browser['family']
or briefer in single code line
user_agent_parser.Parse(request.user_agent.string)['user_agent']['family']
I digress a little from the main trend of this note and give a method that receives all the
User Agent:
request.headers.get("user-agent")
Summing up, at the beginning, I believed the problem was that "request.user_agent.browser" did not return anything and found other methods to get the browser name. But still nothing was written to the database. I couldn't write to the field
"browser_string" in the table
"log" of the database
"vsearchlogDB" anything, the value after insert operation was
Null
