python - How to open a file for both reading and writing ... - Stack ...
Jul 11, 2011 · Is there a way to open a file for both reading and writing? As a workaround, I open the file for writing, close it, then open it again for reading. But is there a way to open a file for both readi...
python - Correct way to write line to file? - Stack Overflow
May 28, 2011 · When the file is opened in text mode (the default), it is translated automatically to the correct line ending for the current platform. Writing "\r\n" would produce "\r\r\n" which is wrong.
python - Difference between modes a, a+, w, w+, and r+ in built-in …
Oct 3, 2025 · In Python's built-in open function, what is the difference between the modes w, a, w+, a+, and r+? The documentation implies that these all allow writing to the file, and says that they open the …
open() in Python does not create a file if it doesn't exist
Jun 3, 2010 · The file pointer is at the end of the file if the file exists. The file opens in the append mode. If the file does not exist, it creates a new file for reading and writing. - Python file modes seek () …
python - How do I append to a file? - Stack Overflow
Jan 16, 2011 · On some operating systems, opening the file with 'a' guarantees that all your following writes will be appended atomically to the end of the file (even as the file grows by other writes). A few …
How to erase the file contents of text file in Python?
May 4, 2010 · the reason this works (in both C++ and python) is because by default when you open a file for writing, it truncates the existing contents. So really it's sorta a side effect, and thus I would …
How to replace/overwrite file contents instead of appending?
When you say "replace the old content that's in the file with the new content", you need to read in and transform the current contents data = file.read(). You don't mean "blindly overwrite it without needing …
python - Writing Unicode text to a text file? - Stack Overflow
May 18, 2011 · The file opened by codecs.open is a file that takes unicode data, encodes it in iso-8859-1 and writes it to the file. However, what you try to write isn't unicode; you take unicode and encode it …
python - Using "with open () as file" method, how to write more than ...
The w flag means "open for writing and truncate the file"; you'd probably want to open the file with the a flag which means "open the file for appending". Also, it seems that you're using Python 2.
Permission denied error while writing to a file in Python
I want to create a file and write some integer data to it in python. For example, I have a variable abc = 3 and I am trying to write it to a file (which doesn't exist and I assume python will creat...