CODEWITHSUNDEEP
python
Illusionist
Illusionist

Reputation: 5509

function with multiple arguments **args

I am learning python and this is from 

http://www.learnpython.org/page/MultipleFunctionArguments

They have an example code that does not work- I am wondering if it is just a typo or if it should not work at all.

def bar(first, second, third, **options):
    if options.get("action") == "sum":
        print "The sum is: %d" % (first + second + third)

    if options.get("return") == "first":
        return first

result = bar(1, 2, 3, action = "sum", return = "first")
print "Result: %d" % result

Learnpython thinks the output should have been-

The sum is: 6
Result: 1

The error i get is-

Traceback (most recent call last):
  File "/base/data/home/apps/s~learnpythonjail/1.354953192642593048/main.py", line 99, in post
    exec(cmd, safe_globals)
  File "<string>", line 9
     result = bar(1, 2, 3, action = "sum", return = "first")
                                                ^
 SyntaxError: invalid syntax

Is there a way to do what they are trying to do or is the example wrong? Sorry I did look at the python tutorial someone had answered but I don't understand how to fix this.

Upvotes: 1

Views: 261

Answers (2)

E.Z.
E.Z.

Reputation: 6661

You probably should not use "return" as an argument name, because it's a Python command.

Upvotes: 1

Tim
Tim

Reputation: 12174

return is a keyword in python - you can't use it as a variable name. If you change it to something else (eg ret) it will work fine.

def bar(first, second, third, **options):
    if options.get("action") == "sum":
        print "The sum is: %d" % (first + second + third)

    if options.get("ret") == "first":
        return first

result = bar(1, 2, 3, action = "sum", ret = "first")
print "Result: %d" % result

Upvotes: 7

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