a = [x * x for x in range(10)]
a = [x for x in range(10) if x % 2] # 后面可以接 if, 相当于融合了map和filter的功能了
a = (x for x in range(10)) # <generator object <genexpr> at 0x000002448BD31000>
a = {"item"+str(x): x for x in range(10)} # 生成字典
a = {"item"+str(x) for x in range(10)} # 生成集合