python write没法写入文件

尝试用python写文件，可是没法写入文件，文件内容为空。原代码片断以下，python poem = "This is a poem" dirs = '~/work/python/' #改成dirs = '/Users/joseph/work/python/' filename = 'poem.txt' path = dirs + filename f = open(path, 'w') f

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