Is explicitly closing files important?

Question

In Python, if you either open a file without calling close(), or close the file but not using try-finally or the \"with\"

Answer 1

During the I/O process, data is buffered: this means that it is held in a temporary location before being written to the file.

Python doesn't flush the buffer—that is, write data to the file—until it's sure you're done writing. One way to do this is to close the file.

If you write to a file without closing, the data won't make it to the target file.