Modes \u2018w\u2019 or \u2018a\u2019 allow a file to be written to, but not to be read from. Similarly, \u2018r\u2019 mode facilitates reading a file but prohibits writing data to it. To be able to perform both read\/write operations on a file without closing it, add the \u2018+\u2019 sign to these mode characters. As a result \u2018w+\u2019, \u2018r+\u2019<\/strong> or \u2018a+\u2019<\/strong> mode will open the file for simultaneous read\/write. Similarly, binary read\/ write simultaneous operations are enabled on file if opened with \u2018wb+\u2019, \u2018rb+\u2019<\/strong> or \u2018ab+\u2019<\/strong> modes.<\/p>\n It is also possible to perform read or write operations at any byte position of the file. As you go on writing data in a file, the end of file (EOF)<\/strong> position keeps on moving away from its beginning. By default, new data is written at the current EOF position. When opened in \u2018r\u2019 mode, reading starts from the 0th byte i.e. from the beginning of the file.
\nThe seek ( )<\/strong> method of file object lets you set current reading or writing position to a desired byte position in the file. It locates the desired position by counting the offset distance from beginning (0), current position (1), or EOF (2). Following example illustrates this point:<\/p>\n