Each test performs a comparison against the argument and returns true or false.

每次测试都会比较自变量，并返回真或假。

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The feof command detects whether you have already read to the end of the file and returns True or False.

feof命令将检测您是否已经读到文件的末尾并返回True或False。

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Bool empty : If the path object contains an empty string for example, path path1 " ", then this routine returns True or False.

bool empty：如果path对象包含空字符串(例如path path1(“ ”))，则此例程将返回True。

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