I'm trying to create a directory if the path doesn't exist, but the ! (not) operator doesn't work. I'm not sure how to negate in Python... What's the correct way to do this?
if (!os.path.exists("/usr/share/sounds/blues")): proc = subprocess.Popen(["mkdir", "/usr/share/sounds/blues"]) proc.wait()
The negation operator in Python is
not. Therefore just replace your
For your example, do this:
if not os.path.exists("/usr/share/sounds/blues") : proc = subprocess.Popen(["mkdir", "/usr/share/sounds/blues"]) proc.wait()
For your specific example (as Neil said in the comments), you don't have to use the
subprocess module, you can simply use
os.mkdir() to get the result you need, with added exception handling goodness.
blues_sounds_path = "/usr/share/sounds/blues" if not os.path.exists(blues_sounds_path): try: os.mkdir(blues_sounds_path) except OSError: # Handle the case where the directory could not be created.
Python prefers English keywords to punctuation. Use
not x, i.e.
not os.path.exists(...). The same thing goes for
|| which are
or in Python.