Handling dependency of functions in python

Question

I want to write a script for automation of sequence of events, where the execution of the next sequence depends upon the success of the previous step. There are basically 8 functions which I want to call onne by one and if one fails, I want to exit at that point. So how can i handle this in python?

Python is already imperative. What's the problem? Do you want some fancy chaining? — keyser
– keyser, Commented Dec 19, 2014 at 15:16
Here at SO, we suggest, improve and help you along the way. We don't write code for you. — Jonathan Davies
– Jonathan Davies, Commented Dec 19, 2014 at 15:17
@Jonathan: if there is something from your experience that you could share for handling situations like this gracefully in python, you are welcome. Also, its pretty apparent from the question that I am not expecting any code — rohit vyawahare
– rohit vyawahare, Commented Dec 19, 2014 at 15:24

Jonathan Davies · Accepted Answer · 2014-12-19 23:32:51Z

2

Basic if, and elif statements can overcome your needs.

Say you had a function that returned a variable.

def f(z):
    data = z
    return data

You can analyse the result with a if. Assign a new variable to the function f:

x = f(0)
if x == 0:
    #do something

So if x is equal to 0, continue with code. But what is c = 1?

import os
x = f(1)
if c != 0:
    os._exit(0)

os._exit(0) quits the program.

edited Dec 19, 2014 at 23:32

answered Dec 19, 2014 at 15:25

Jonathan Davies

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Comments

Bill Agee · Accepted Answer · 2014-12-20 09:41:56Z

0

I highly recommend taking a look at pytest (or one of the other Python testing frameworks).

This guide should get you up and running quickly:

http://pytest.org/latest/getting-started.html

answered Dec 20, 2014 at 9:41

Bill Agee

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