當我跑步時a = ["I","love","you"]a = {(word) for word in a}print a我得到這個結果set(['I', 'you', 'love'])這就是我的期望。但是當我跑步時a = ["I","love","you"]a = {((word) for word in c)for c in a}print a我得到一些意想不到的結果：set([<generator object <genexpr> at 0x1004d5280>, <generator object <genexpr> at 0x1004d5320>, <generator object <genexpr> at 0x1004d5370>])我期望的是set(['e','I','u','o','v','l','y')誰能告訴我導致這個問題的原因？