pick_ngrams: add param how_many + type checks

also add a test string test_str

da_detector.py

@@ -45,23 +45,31 @@ class da_detector:
 			raise e
 		return obj
 
-	def pick_ngrams(self, what_grams: int, text: str):
+	def pick_ngrams(self, what_grams: int, how_many: int, text: str):
 		if not isinstance(what_grams, int):
 			raise TypeError("what_grams has to be an int")
-
-		self.what_grams = what_grams
+		if not isinstance(how_many, int):
+			raise TypeError("how_many has to be an int")
+		if not isinstance(text, str):
+			raise TypeError("text has to be a str")
 
 		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")
+		if (how_many <= 0):
+			raise ValueError("how_many ought to be larger than 0")
+		if (len(text) <= 10):
+			raise ValueError("not doing anything with text shorter than 10 characters")
 
 		#  TODO(me): complete n-gram picking method implementation
 
 
 freqs_folder = "./freqs/"
+test_str = "what freaking ever, nobody cares one bit of a heck"
+
 detector = da_detector()
-detector.pick_ngrams(3, "")
+detector.pick_ngrams(3, 10, test_str)
 
 sk_json = detector.parse_freqs("sk.json")
 cz_json = detector.parse_freqs("cz.json")