[python] Make python lint pass (#4296)

utils/SwiftIntTypes.py

@@ -14,14 +14,17 @@ _all_integer_type_bitwidths = [8, 16, 32, 64]
 # Number of bits in the biggest int type
 int_max_bits = max(_all_integer_type_bitwidths)
 
-def int_max(bits, signed): 
-    bits = bits - 1 if signed else bits 
+
+def int_max(bits, signed):
+    bits = bits - 1 if signed else bits
     bits = max(bits, 0)
     return (1 << bits) - 1
-    
+
+
 def int_min(bits, signed):
     return (-1 * int_max(bits, signed) - 1) if signed else 0
 
+
 class SwiftIntegerType(object):
 
     def __init__(self, is_word, bits, is_signed):
@@ -33,7 +36,7 @@ class SwiftIntegerType(object):
             self.possible_bitwidths = [32, 64]
         else:
             self.possible_bitwidths = [bits]
-            
+
         self.min = int_min(bits, is_signed)
         self.max = int_max(bits, is_signed)
 
@@ -128,4 +131,3 @@ def all_integer_assignment_operator_names():
 
 def all_integer_or_real_assignment_operator_names():
     return ['=', '*=', '/=', '+=', '-=']
-