python 上没有 soundex

Question

I use the sqlite3 librairy on python to interact with a.db file. With this request:

SELECT * FROM LesFilms F JOIN LesRealisateurs R ON (F.film_id=R.film_id) WHERE realisateur="Tim Burtyn" or soundex("Tim Burtyn")=soundex(R.realisateur) or realisateur like"T%m Burtyn" or realisateur like"Tim B%rtyn" or realisateur like"Tim Burt%n";

I got this error:

sqlite3.OperationalError: no such function: soundex

Do someone already face this problem? I share the whole request in case, I'm a total beginner.

Thank you,

Elias

Answer 1

I think you are out of luck, as you have probably gathered from the comments. The Python standard library module sqlite3 generally provides an up-to-date version of sqlite.

• In Python 3.9 it is 3.32.3 from June 2020.
• In Python 3.8 it is 3.31.1 from January 2020.
• In Python 3.7 and Python 2.7.17 it is 3.28.0 from April 2019.

But the Python sqlite3 library does not provide optional sqlite features that come switched off by default. This includes the soundex function. I can't recommend that you try building your own version of the Python standard library module with the option switched on. That sort of thing is best left to Python implementers.

As an alternative you might try the levenshtein module: pip install python-Levenshtein or the metaphone module: pip install Metaphone .

To use either you would need to fetch more records from the database than you really want, for example where realisateur like "T%" and then discard the mismatches in Python code rather than in the where clause.

This is not as bad as it sounds, and may have benefits. Soundex was developed in the early 20th century and so it was intended for people to be able to compute it quickly by hand. It has significant deficiencies, as shown by the many attempts in the subsequent 100 years to improve it. The primary reason for its popularity is because it is provided by many SQL implementations, not because it is particularly good.

Answer 2

load your data into a dataframe then use fuzzywuzzy to find similar string words