What is the Significance of the Asterisk (*) in Python?
The asterisk (*) holds a significant purpose in Python, comparable to its usage in C. In Python, it serves multiple roles in function definitions and calls.
Function Definitions with Asterisk Argument:
In function definitions, the syntax *identifier introduces a parameter that gathers any remaining positional arguments into a tuple. If no excess arguments are provided, it defaults to an empty tuple. The following function definition demonstrates this concept:
def get(*a, **kw)
Here, a collects any extra positional arguments, while kw gathers any excess keyword arguments into a dictionary.
Function Calls with Asterisk Argument:
When calling a function, the asterisk can be employed to unpack arguments stored in tuples or dictionaries. For instance:
Positional Arguments:
def foo(a, b, c, *args): print(a, b, c, args) args_tuple = ("testa", "testb", "testc", "excess") foo(*args_tuple) # unpacks positional arguments from a tuple
Keyword Arguments:
def foo(a, b, c, **args): print(a, b, c, args) arg_dict = {"a": "testa", "b": "testb", "c": "testc", "excessarg": "string"} foo(**arg_dict) # unpacks keyword arguments from a dictionary
The asterisk operator allows for flexible handling of excess arguments in both function definitions and calls. For an in-depth explanation, refer to the Python Language Reference under "Function Definitions" and "Function Calls."
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