Create is_good_str.py (#210)

* Create is_good_str.py

As discussed in #201

* Placate mypy

* Update README.md

algorithms/Python/README.md

@@ -25,5 +25,6 @@
 4. [Selection Sort](sorting/selection_sort.py)
  
 ## Strings
-1. [Palindrome](strings/palindrome.py)
+1. [Is Good Str](strings/is_good_str.py)
-2. [Word Count](strings/word_count.py)
+2. [Palindrome](strings/palindrome.py)
+3. [Word Count](strings/word_count.py)

algorithms/Python/strings/is_good_str.py

@@ -0,0 +1,29 @@
+# https://practice.geeksforgeeks.org/problems/good-or-bad-string1417/1/
+
+from string import ascii_lowercase
+
+vowels = "aeiou"
+constants = "".join(c for c in ascii_lowercase if c not in vowels)
+
+
+def is_good_str(s: str) -> bool:
+    """
+    >>> is_good_str("aeioup??")
+    True
+    >>> is_good_str("bcdaeiou??")
+    False
+    """
+    c_or_v = ""
+    for char in s.lower():
+        if char in constants:
+            c_or_v += "c"
+        else:
+            c_or_v += "v" if char in vowels else char
+    return not "c" * 4 in c_or_v.replace("?", "c") and (
+        not "v" * 6 in c_or_v.replace("?", "v")
+    )
+    
+
+if __name__ == "__main__":
+    print(is_good_str("aeioup??"))
+    print(is_good_str("bcdaeiou??"))