How can I make one python file run another?
Question:
How can I make one python file to run another?
For example I have two .py files. I want one file to be run, and then have it run the other .py file.
Answers:
You’d treat one of the files as a python module and make the other one import it (just as you import standard python modules). The latter can then refer to objects (including classes and functions) defined in the imported module. The module can also run whatever initialization code it needs. See http://docs.python.org/tutorial/modules.html
There are more than a few ways. I’ll list them in order of inverted preference (i.e., best first, worst last):
- Treat it like a module:
import file. This is good because it’s secure, fast, and maintainable. Code gets reused as it’s supposed to be done. Most Python libraries run using multiple methods stretched over lots of files. Highly recommended. Note that if your file is called file.py, your import should not include the .py extension at the end.
- The infamous (and unsafe) exec command: Insecure, hacky, usually the wrong answer. Avoid where possible.
execfile('file.py') in Python 2exec(open('file.py').read()) in Python 3
- Spawn a shell process:
os.system('python file.py'). Use when desperate.
Get one python file to run another, using python 2.7.3 and Ubuntu 12.10:
-
Put this in main.py:
#!/usr/bin/python
import yoursubfile
-
Put this in yoursubfile.py
#!/usr/bin/python
print("hello")
-
Run it:
python main.py
-
It prints:
hello
Thus main.py runs yoursubfile.py
There are 8 ways to answer this question, A more canonical answer is here: How to import other Python files?
- you can run your .py file simply with this code:
import os
os.system('python filename.py')
note:
put the file in the same directory of your main python file.
You could use this script:
def run(runfile):
with open(runfile,"r") as rnf:
exec(rnf.read())
Syntax:
run("file.py")
It may be called abc.py from the main script as below:
#!/usr/bin/python
import abc
abc.py may be something like this:
print'abc'
from subprocess import Popen
Popen('python filename.py')
I used subprocess.call it’s almost same like subprocess.Popen
from subprocess import call
call(["python", "your_file.py"])
How can I make one python file to run another?
For example I have two .py files. I want one file to be run, and then have it run the other .py file.
You’d treat one of the files as a python module and make the other one import it (just as you import standard python modules). The latter can then refer to objects (including classes and functions) defined in the imported module. The module can also run whatever initialization code it needs. See http://docs.python.org/tutorial/modules.html
There are more than a few ways. I’ll list them in order of inverted preference (i.e., best first, worst last):
- Treat it like a module:
import file. This is good because it’s secure, fast, and maintainable. Code gets reused as it’s supposed to be done. Most Python libraries run using multiple methods stretched over lots of files. Highly recommended. Note that if your file is calledfile.py, yourimportshould not include the.pyextension at the end. - The infamous (and unsafe) exec command: Insecure, hacky, usually the wrong answer. Avoid where possible.
execfile('file.py')in Python 2exec(open('file.py').read())in Python 3
- Spawn a shell process:
os.system('python file.py'). Use when desperate.
Get one python file to run another, using python 2.7.3 and Ubuntu 12.10:
-
Put this in main.py:
#!/usr/bin/python import yoursubfile -
Put this in yoursubfile.py
#!/usr/bin/python print("hello") -
Run it:
python main.py -
It prints:
hello
Thus main.py runs yoursubfile.py
There are 8 ways to answer this question, A more canonical answer is here: How to import other Python files?
- you can run your .py file simply with this code:
import os
os.system('python filename.py')
note:
put the file in the same directory of your main python file.
You could use this script:
def run(runfile):
with open(runfile,"r") as rnf:
exec(rnf.read())
Syntax:
run("file.py")
It may be called abc.py from the main script as below:
#!/usr/bin/python
import abc
abc.py may be something like this:
print'abc'
from subprocess import Popen
Popen('python filename.py')
I used subprocess.call it’s almost same like subprocess.Popen
from subprocess import call
call(["python", "your_file.py"])