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pythonargskeyword-argument

How to check if *args[0] exists?

In Python, how can I check if *args[0] exists?

def my_fxn(self, *args):
    print(args[0])

my_fxn('ABC')  # this prints 'ABC'
my_fxn()       # this crashes with "IndexError: tuple index out of range"
Solution

  • If you work with *args, *args will be a tuple (with zero, one or more elements). The truthiness of a tuple is True if it contains at least one element. So you can simply write:

    def my_fxn(self, *args):
    if args:
        print(args[0])