How do you use Python parameters?

2 years ago
Noah Thompson
2 minutes

In Python, you can define and use parameters using the following methods:

  1. Positional arguments: Parameters passed in the order they are defined, can be called using parameter names directly. Example:
def greet(name, age):
    print(f"Hello, {name}! You are {age} years old.")

greet("Alice", 25)
  1. Keyword arguments: Use parameter names and corresponding values to pass arguments, can be passed in any order. Example:
def greet(name, age):
    print(f"Hello, {name}! You are {age} years old.")

greet(age=25, name="Alice")
  1. Default Arguments: Setting default values for parameters when defining a function, using the default value if the corresponding argument is not provided when calling the function. Example:
def greet(name, age=18):
    print(f"Hello, {name}! You are {age} years old.")

greet("Alice")  # 使用默认值
greet("Bob", 30)  # 提供参数值，覆盖默认值
  1. Variable Arguments: accepting an arbitrary number of parameters, which can be either positional or keyword arguments. Example:
  2. Variable positional parameters (*args): Allow for passing in any number of positional arguments, which will be packaged into a tuple.
  3. Create a function called sum that takes any number of arguments, calculates the total sum of the arguments, and returns the total. Then call the function with arguments 1, 2, and 3, and print the result, which should be 6.
  4. Key variable arguments (**kwargs): Any number of keyword arguments can be passed in, which will be packaged into a dictionary.
  5. Print information with the given name and age values: name: Alice, age: 25.

Above are the common Python parameter usage methods, and you can choose the appropriate parameter type and usage based on specific needs.

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