Fix formatting issues for Pascal

thinkcspy/Chapter-16-Exercises/Problem13_pascal.py

@@ -3,13 +3,26 @@
 # Problem 13
 
 def createTriangle(numRows):
+    triangle = []
+
     if numRows < 0:
         return
     else:     
         for i in range(numRows+1):
-            spaces = ("  "*(numRows-i)) 
-            nums = f"{createRow(i)}"
-            print(spaces + nums)
+            triangle.append(createRow(i))
+
+        lastRow = triangle[-1]
+        numWidth = len(str(max(lastRow))) + 1
+        triWidth = numWidth * len(lastRow)
+
+        for row in triangle:
+            triStr = ""
+
+            for num in row:
+                numStr = str(num)
+                triStr += numStr + " " * (numWidth - len(numStr))
+            
+            print(triStr.center(triWidth))
 
 
 def createRow(currentRow):
@@ -19,9 +32,7 @@ def createRow(currentRow):
         coefficient = getbinomial(currentRow, i)
         row.append(coefficient)
 
-    result = "  ".join(map(str, row))
-
-    return result
+    return row
 
 def getbinomial(n, k):
     numerator = factorial(n)