chore: add base of pick_ngrams() method

da_detector.py

@@ -45,9 +45,23 @@ class da_detector:
 			raise e
 		return obj
 
+	def pick_ngrams(self, what_grams: int, text: str):
+		if not isinstance(what_grams, int):
+			raise TypeError("what_grams has to be an int")
+
+		self.what_grams = what_grams
+
+		if (what_grams <= 0):
+			raise ValueError("this is bogus, give me a number from ℕ")
+		elif (what_grams > 5):
+			raise ValueError("not doing larger-grams than 5")
+
+		#  TODO(me): complete n-gram picking method implementation
+
 
 freqs_folder = "./freqs/"
 detector = da_detector()
+detector.pick_ngrams(3, "")
 
 sk_json = detector.parse_freqs("sk.json")
 cz_json = detector.parse_freqs("cz.json")