perf(stdnum.pl): optimize PESEL & NIP validation checksums using zero-allocation accumulator loop

stdnum/pl/nip.py

@@ -45,10 +45,15 @@ def compact(number: str) -> str:
  return number
 
 
+_weights = (6, 5, 7, 2, 3, 4, 5, 6, 7, -1)
+
+
 def checksum(number: str) -> int:
  """Calculate the checksum."""
- weights = (6, 5, 7, 2, 3, 4, 5, 6, 7, -1)
- return sum(w * int(n) for w, n in zip(weights, number)) % 11
+ total = 0
+ for w, n in zip(_weights, number):
+ total += w * (ord(n) - 48)
+ return total % 11
 
 
 def validate(number: str) -> str:

stdnum/pl/pesel.py

@@ -88,12 +88,16 @@ def get_gender(number: str) -> str:
  return 'M'
 
 
+_weights = (1, 3, 7, 9, 1, 3, 7, 9, 1, 3)
+
+
 def calc_check_digit(number: str) -> str:
  """Calculate the check digit for organisations. The number passed
  should not have the check digit included."""
- weights = (1, 3, 7, 9, 1, 3, 7, 9, 1, 3)
- check = sum(w * int(n) for w, n in zip(weights, number))
- return str((10 - check) % 10)
+ total = 0
+ for w, n in zip(_weights, number):
+ total += w * (ord(n) - 48)
+ return str((10 - total) % 10)
 
 
 def validate(number: str) -> str: