What are the methods of passing parameters in python?

Inpython, there are the following methods to pass parameters:

1. Positional parameters: Pass values in the order of parameters in the function definition. This is the most common approach, where the parameter's value is matched based on position.

def add(a, b): return a + b result = add(3, 5) print(result)# 输出：8

2. Keyword parameters: Use the parameter name to specify the value of the parameter. You can pass the value not in the order in the function definition.

def add(a, b): return a + b result = add(a=3, b=5) print(result)# 输出：8

3. Default parameters: Specify default values for parameters when the function is defined. If the value of the parameter is not provided when the function is called, the default value is used.

def add(a, b=5): return a + b result = add(3) print(result)# 输出：8

4. Variable parameters: Any number of parameters can be accepted. There are two ways to define variadic parameters:
   • *args: Accepts any number of positional arguments, passed as a tuple.
   • **kwargs: Accepts any number of keyword arguments, passed in the form of a dictionary.

def add(*args): result = 0 for num in args: result += num return result result = add(1, 2, 3, 4, 5) print(result)# 输出：15

def greet(**kwargs): for key, value in kwargs.items(): print(f"{key}: {value}") greet(name="Alice", age=25)# 输出：name: Alice, age: 25

These methods can flexibly meet different needs, and the appropriate method can be selected for parameter transfer according to the parameter type and calling method of the function.

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