print("\nTest quotations.")
print("Welcome to the GPA calculator.");
print("""Welcome to the GPA calculator.
Please enter all your letter grades, one per line.
Enter a blank line to designate the end.""");

print("\nPairs.");
pairs = [('ga','Irish'), ('de','German')];
print(pairs[0]);

print("\nThe modulo operator.");
print("27 // 4 =");
print(27 // 4);

print("\nInteger division.");
print("27 % 4 =");
print(27 % 4);
Add some python test codes.