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My requirement is to pass a tuple as command line argument like
--data (1,2,3,4) I tried to use the argparse module, but if I pass like this it is receiving as the string '(1,2,3,4)'. I tried by giving type=tuple for argparse.add_argument, but is of no use here.
Do I have to add a new type class and pass that to type argument of add_argument?
Update
I tried the ast.literal_eval based on answers. Thanks for that. But it is giving spaces in the result as shown below.
(1,2,3,4) <type 'str'> (1, 2, 3, 4) <type 'tuple'> 
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This method of passing a tuple as an argument to a function involves unpacking method. Unpacking in Python uses *args syntax. As functions can take an arbitrary number of arguments, we use the unpacking operator * to unpack the single argument into multiple arguments.
The *args thing returns tuple because of that, and if you really need a list, you can transform it with one line of code! So in general: It speeds up your program execution. You do not it to change the arguments. It is not that hard to change it's type.
The arguments that are given after the name of the program in the command line shell of the operating system are known as Command Line Arguments. Python provides various ways of dealing with these types of arguments. One of them is sys module.
Set nargs of the data argument to nargs="+" (meaning one or more) and type to int, you can then set the arguments like this on the command line:
--data 1 2 3 4 args.data will now be a list of [1, 2, 3, 4].
If you must have a tuple, you can do:
my_tuple = tuple(args.data) Putting it all together:
parser = argparse.ArgumentParser() parser.add_argument('--data', nargs='+', type=int) args = parser.parse_args() my_tuple = tuple(args.data) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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