forwhile循环遍历文件

复习使用for、while循环遍历文件，数据类型转换

用for循环做遍历，其实就相当于使用next()函数 next()一次只取一行 2.while循环遍历文件 while 循环遍历文件 学之前，先理解fd.readline()，它是一行一行读，最后返回空字符串；while是需要条件的，通过最后一行返回空的条件来退出循环：...

Python中的用for,while循环遍历文件实例

使用for循环遍历文件打开文件 open r:以读模式打开 w:以写模式打开 a:以追加模式打开 r+:以读写模式打开 w+:以读写模式打开（参见w）a+:以读写模式打开（参见a）rb:以二进制读模式打开 wb:以二进制写模式打开（参见w）ab:以二进制追加模式...

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