python 中将列表作为字符串输出

 

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>>> a = [111, 222, 333]
>>> "-".join(a)                       ## 数值类型报错
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sequence item 0: expected str instance, int found
>>> "-".join(str(x) for x in a)      ## 类型转换
'111-222-333'
>>> b = ["aaa", "bbb", "ccc"]
>>> "-".join(b)
'aaa-bbb-ccc'