施文峰 <ke26537...@gmail.com> added the comment: hi Steven
thanks for check my post first test have a problem,you didn’t use r+ mode step is 1. f.read 2. f.truncate(0) 3. f.write(something) my test msg tell you “ tell after delete content 33 content 0 tell after write 65 “ so you know after truncate f.tell =33 but no content in file and after you write something into file msg tell you f.tell =65 but “ {"how_dare_you": "how_dare_you"}” is only 33 length so you know must have someing in file please use editor open the file you will find it ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42733> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com