Python script uses 100% CPU

Question

Hey I was working with python. In my python file I just have 2 lines like :

#!/usr/bin/env
print("hello")

and I make my .py file executable and run it(./hello.py) on ubuntu server. With "top" command, i listed all processes. hello.py uses 100% CPU. Why it use 100% CPU(Server has 512MB 1 CPU)

Not sure if it'll fix your cpu consumption problem, but the shebang needs python, i.e. add python to the header: #!/usr/bin/env python — chickity china chinese chicken
– chickity china chinese chicken, Commented Sep 19, 2016 at 22:16
When I write #!/usr/bin/env python it says "/usr/bin/env: ‘python’: No such file or directory" — Tayfun Akgüç
– Tayfun Akgüç, Commented Sep 19, 2016 at 22:20
Check what which python returns. Then try changing that line to use that python version, perhaps it needs to be something like #!/usr/bin/env python3 — chickity china chinese chicken
– chickity china chinese chicken, Commented Sep 19, 2016 at 22:27

user2357112 · Accepted Answer · 2016-09-19 22:47:31Z

5

Your incorrect shebang line of

#!/usr/bin/env

causes the system to launch /usr/bin/env to handle the script, as follows:

/usr/bin/env ./hello.py

/usr/bin/env treats the first argument not containing = and not starting with - as a program to run, so it tries to launch ./hello.py. Due to the incorrect shebang line, this once again runs

/usr/bin/env ./hello.py

It's an infinite loop.

edited Sep 19, 2016 at 22:47

answered Sep 19, 2016 at 22:31

user2357112

286k32 gold badges491 silver badges571 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Python script uses 100% CPU

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related