Solve problem 347 and some reformatting.

python/e206.py

@@ -2,13 +2,14 @@ import math
 
 
 def is_square(apositiveint):
-    """ From: https://stackoverflow.com/a/2489519 """
+    """From: https://stackoverflow.com/a/2489519"""
     x = apositiveint // 2
     seen = set([x])
     while x * x != apositiveint:
-         x = (x + (apositiveint // x)) // 2
-         if x in seen: return False
-         seen.add(x)
+        x = (x + (apositiveint // x)) // 2
+        if x in seen:
+            return False
+        seen.add(x)
     return True
 
 
@@ -16,7 +17,7 @@ def canditates(current_value, depth):
     if depth <= 0:
         yield current_value
     else:
-        d = 10 ** depth
+        d = 10**depth
         for i in range(10):
             for new_value in canditates(current_value - i * d, depth - 2):
                 yield new_value
@@ -32,5 +33,4 @@ def euler_206():
 if __name__ == "__main__":
     solution = euler_206()
     print("e206.py: " + str(solution))
-    assert(solution == 1389019170)
-
+    assert solution == 1389019170