Aug 1, 2014 · Open a file for writing in your python interpreter, write a string to it, then open that file in a text editor. On my system, the file will be empty until I close the file handle.

I want to read a .csv file in python. I don't know if the file exists. My current solution is below. It feels sloppy to me because the two separate exception tests are awkwardly juxtaposed. Is th...

Feb 25, 2010 · I am using Python to write chunks of text to files in a single operation: open (file, 'w').write (text) If the script is interrupted so a file write does not complete I want to have no file …

I prefer to have output functions explicitly accept a file handle (or file-like object), rather than accept a file name and opening the file themselves. This way, I can pass a StringIO object to …

Jan 9, 2016 · Does asyncio supports asynchronous I/O for file operations? If yes, how I can use this in Python 3.5 with async/await syntax code?

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 …

Jun 24, 2012 · Python uses stdio's fopen function and passes the mode as argument. I am assuming you use windows, since @Lev says the code works fine on Linux. The following is …

Jul 5, 2012 · 0 IO operations consume too much time. Open and close the file, also. It's much faster if you open both files (the input and the output), use a memory buffer with, let's say, …

While it is easy enough to iterate in Python over some units you are still going to be constrained by memory. I don't think you want to read a line at a time and write it back out that would take …

A commenter in another topic expressed the opinion that a file move is an expensive operation. I expected that python uses the Linux mv command which is very fast because it only involves …