reconlicer: Move match thresholds to top of module

conservancy_beancount/reconcile/statement_reconciler.py

@@ -79,6 +79,11 @@ Other related problems we're not dealing with here:
  - transactions are entered manually and reconciled after the fact, but
    importing from statements may be useful in some cases
 
+Current issue:
+
+ - entry_point seems to swallow errors, meaning you get a fairly unhelpful
+   message if there's an unhandled error
+
 Future possibilities:
 
  - allow the reconciler to respect manually-applied metadata - not clear how
@@ -90,10 +95,6 @@ Future possibilities:
    reconciles and summarises the unreconciled transactions
 """
 
-# TODO:
-#  - entry_point seems to swallow errors
-#  - extract the magic numbers
-
 import argparse
 import collections
 import copy
@@ -150,6 +151,8 @@ JUNK_WORDS = [
 ]
 JUNK_WORDS_RES = [re.compile(word, re.IGNORECASE) for word in JUNK_WORDS]
 ZERO_RE = re.compile('^0+')
+FULL_MATCH_THRESHOLD = 0.8
+PARTIAL_MATCH_THRESHOLD = 0.4
 
 
 def remove_duplicate_words(text: str) -> str:
@@ -352,9 +355,9 @@ def records_match(r1: Dict, r2: Dict) -> Tuple[float, List[str]]:
     else:
         check_score = 0.0
         payee_score = payee_match(r1['payee'], r2['payee'])
-        if payee_score > 0.8:
+        if payee_score > FULL_MATCH_THRESHOLD:
             payee_message = ''
-        elif payee_score > 0.4:
+        elif payee_score > PARTIAL_MATCH_THRESHOLD:
             payee_message = 'partial payee match'
         else:
             payee_message = 'payee mismatch'