Preparing git repo for final project

problems/pset2/plates/plates.py

@@ -0,0 +1,39 @@
+import re
+
+
+def main():
+    plate = input("Plate: ")
+    if is_valid(plate):
+        print("Valid")
+    else:
+        print("Invalid")
+
+
+def is_valid(s):
+    if len(s) < 2 or len(s) > 6:
+        return False
+    return re.match(r"^[A-Z]{2,}([1-9]\d+)?(?![A-Z])$", s)
+
+
+def loopy_is_valid(s):
+    length = 0
+    has_digits = False
+    for n, c in enumerate(s):
+        if n > 6:
+            return False
+        if not c.isalnum():
+            return False
+        if n < 2 and not c.isalpha():
+            return False
+        if c.isdigit():
+            if not has_digits and c == '0':
+                return False
+            has_digits = True
+        elif has_digits:
+            return False
+        length += 1
+    return length >= 2
+
+
+if __name__ == "__main__":
+    main()