What are the methods of passing parameters in python?

In python, 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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