how to continue a while loop with an open file using os in python3

Asked Aug 21 '16 at 01:51

Active Aug 21 '16 at 01:55

Viewed 167 times

So lets say that i created a while loop where the user inputs a name and it outputs his last name

choice = input()
if choice == "Mark":
   print("Zuckerberg")
elif choice == "Sundar":
   print("Pichai")

but i want to help the user and when he types "help" a .txt file will open up and as i want it to be an infinite loop its going to be a while...(joke)

import os

choice = input()
while True:
    if choice == "Mark":
       print("Zuckerberg")
    elif choice == "Sundar":
       print("Pichai")
    elif choice == "help":
       howto = "notepad.exe howto.txt"
       os.system(howto)

as it is is going to run but when you open the file 'choice' is going to stop running resulting to not print out the surnames. if you close the .txt file it will continue but how do i make it work without closing the file?

Thanks in advance

edited Aug 21 '16 at 01:55

OneCricketeer

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asked Aug 21 '16 at 01:51

mangafas

3

[`subprocess.Popen(howto)`](https://docs.python.org/2/library/subprocess.html#subprocess.Popen) – Aran-Fey Aug 21 '16 at 01:54
@Rawing Are you sure about that? Docs says "Wait for command to complete" – OneCricketeer Aug 21 '16 at 01:56
1

@Rawing: I think he wants `subprocess.Popen([howto])`. python will wait for a termination signal to continue when using `call` – James Aug 21 '16 at 01:57
@cricket_007 My bad, I shouldn't be posting at 4am I guess. – Aran-Fey Aug 21 '16 at 01:58
@Rawing i didn't even understand how to use subprocess its an unresolved reference if i put in my code right away – mangafas Aug 21 '16 at 01:59
@mangafas `import subprocess` – Aran-Fey Aug 21 '16 at 02:00
@Rawing yeah sorry it worked... why dont you post it as an answer so it will be easier for people to find the answer? – mangafas Aug 21 '16 at 02:02
@James i think on the duplicate it says that his external command wasn't working right? – mangafas Aug 21 '16 at 02:04

how to continue a while loop with an open file using os in python3

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