Fix ch4 exercise syntax error; cleanup

Author: dbader

ch04-strings-and-string-methods/6-working-with-strings-and-numbers.py

@@ -33,4 +33,4 @@
 a = input("Enter a number: ")
 b = input("Enter another number: ")
 product = float(a) * float(b)
-print("The product of " + a + " and " + b + " is " + str(product).)
+print("The product of " + a + " and " + b + " is " + str(product) + ".")

ch08-conditional-logic/9a-challenge-simulate-an-election.py

@@ -10,7 +10,7 @@
 num_times_B_wins = 0
 
 num_trials = 10_000
-for trial in range(0,num_trials):
+for trial in range(0, num_trials):
     votes_for_A = 0
     votes_for_B = 0