for s = '' for i in range(3): s += str(i) print(i) # => 2 print(s) # => '012' s = '' # 3<= i < 10 でループ for i in range(3, 10): s += str(i) print(s) # => '3456789' リストをループ s = '' arg = ['foo', 'bar', 'buz'] for i in arg: s += i pr…