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In Python 2.7, taxonomy based search doesn't work

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
search

Research direction

Start by reproducing the example using pattern.search.taxonomy and search with Python 2.7, then compare the same flow under Python 3.6.4. Trace the taxonomy-based search call that raises TypeError: can't compile 'str' object. Done means the supplied taxonomy search works on Python 2.7 without that error and continues to work under Python 3.6.4.

Written by the indexing model from the issue text.

Description

from pattern.search import search, taxonomy, Classifier
from pattern.en import parsetree

for flower in ("rose", "lily", "daisy", "daffodil", "begonia"):
      taxonomy.append(flower, type="flower")

tree = parsetree("A field of white daffodils.", lemmata=True) 
result = search("FLOWER", t)                              # TypeError: can't compile 'str' object

The search function fails in 2.7, whereas it works in 3.6.4

Dominant language
Python
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