尝试查找进程是否在Python中仍然存在

Question

I'm using psutil in order to know when a process is running.

So far I have this code:

PROCESS_NAME = 'python.exe'
for p in psutil.process_iter():
  if p.name == PROCESS_NAME:
    print("It's alive!")
    break

However, it doesn't seem to work.

I've looked around on google and here but every post suggests that the code above would be correct.

Unless I'm clearly misunderstanding how process_iter() works....

Answer 1

Bad Python Syntax:

This line is wrong:

if p.name == "PROCESS_NAME":    # BAD

It looks for a process whose name is, literally, «PROCESS_NAME». Instead, you want to look for a process whose name is the same as the name referred to by the variable PROCESS_NAME, like so:

if p.name == PROCESS_NAME:      # GOOD

The right-hand-side of the first line is a string literal. The right-hand-side of the second is the name of a variable.

Of course, if you are always going to look for the same name, you can put that name in a string literal:

if p.name == "python.exe":     # ALSO GOOD

---

New PSUTIL API:

Between version 1.2.1 and version 2 of psutil , they changed the api. In version 1, p.name is the name of the process. In version 2, p.name is a function which returns a string which is the name of the process.

So, try this:

if p.name() == PROCESS_NAME: