Can only one file be open at once? If no, does the file.close() method close all open files...

Question

Multiple files

Answer 1

No and no. There is an open files limit, but you're completely at liberty to leave open files all over the place because python will clean up after you.

http://stackoverflow.com/questions/7395542/is-explicitly-closing-files-important

Try this in C++ and you'll lose data.

Answer 2

After answering the first time I noticed that Python supports directly opening handles (integer references rather than file objects). This is more 'low level' but importantly allows you to use commands to close a block of open files:

https://docs.python.org/3/library/os.html

Search for: os.closerange

Answer 3

I've got what you mean, in this example 'file' is a name of variable, you can open as much files as you want:

a = open(some.txt, r)
b = open(data.csv, rb)
C = open(somedata.txt, wb)

etc

a.close

Variable is now stuck to the file, till file is closed, closed files are removed from memory, and will be synced to disk(if will be write).