Data scientist at Port Jackson Partners in Sydney, Australia. My PhD was in computational biology. In my spare time I write about medical research at BioSky.co.CVAbout
You can use the Python os module to send commands out to the operating system. Through os you can do anything from changing the current working directory through to listing the contents of a directory.
import os # print the current working directory print os.getcwd() # change the working directory os.chdir("..") # create a new directory os.mkdir("new_folder") # list the contents of a directory os.listdir("new_folder") # remove directory os.rmdir("new_folder") # remove a file os.remove("image.jpg") # rename a file/directory and where it will go os.rename("/data/jack", "/james")
The os.listdir command can be extremely useful, and with a little more code you can run some checks on the contents of the directory you’re looking in:
# check if you're looking at a file or directory os.path.isdir("afolder") os.path.isfile("image.jpg")
Finally, I’d like to talk about the os.path class, which allows you to specify the path to directories on all operating systems (remembering that in windows the path separator is a “” while on a Mac/Linux machine it is a “/”.
# join together a path which will work on linux, windows and macs os.path.join("os.getwcw(), "data") # check if a path exists os.path.exists("/data/research/paper") # split a path into a the final directory/file and the rest of the path os.path.split("/data/research/measurements.doc") # split path to find the file type - eg. ".doc" os.path.splitext("/data/test/img.jpg")