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I am beginner in Python programing, I want to pass a complex object (Python dictionary or class object) as an argument to a python script using command line (cmd). I see that sys.argv gets only string parameters.

Here is an example of what I want:

class point(object):
     def __init__(self,x,y):
         self.__x=x
         self.__y=y
p=point(4,8)
import os
os.system('""xxxxxx.exe" "-s" "../create_scenario.py" "'+ p +'""')

The xxxxxx.exe is a program which accept to run a python script with the -s option. Thanks for all!!!

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5  
Sorry, we don't do urgent here. For time-critical answers, please hire a consultant. – Martijn Pieters Apr 18 at 11:58
os.system is really bad. – segfolt Apr 18 at 11:58
1  
Your only option is to save it to a file. On a side note: using __x is for name mangling which I'm pretty sure you don't need in the point class. You might have wanted a private variable _x if you have getter and setter functions/property but otherwise just leave it as self.x – jamylak Apr 18 at 11:59
segfolt >> What to use so if os.system is really bad ? – user2294884 Apr 18 at 12:02
See this post:stackoverflow.com/questions/3479728/… – segfolt Apr 18 at 12:13

2 Answers

up vote 0 down vote

You could use eval:

my_dict = eval(sys.argv[1])
print(my_dict)

Comand prompt:

$ my_script.py {1:2}
$ {1: 2}

But what you want to do is not recommended (see this post). You should avoid this and store your data in a file instead (using JSON for example).

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Thank you. But how to use exec ? – user2294884 Apr 18 at 12:10
I did slight changes to my post. – segfolt Apr 18 at 12:25
1  
There are better alternatives than eval. Using JSON for example. – Martijn Pieters Apr 18 at 12:54
up vote 0 down vote

You could try serialize\deserialize to\from a string using a pickle module. Look for dumps and loads

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