Function Parameter
Function with parameter
In Python, a function parameter is a variable that is used to pass information into a function when it is called. When you define a function, you can specify the parameters that the function should accept as input. These parameters become variables that you can use within the function to perform your desired task.
# This function should return the area of a circle when given the appropriate
# parameter Pi * r ** 2
PI = 3.142 # a constant, meaning that you should not change it [but of course can be changed eventually]
def area_of_a_circle(radius):
result = PI * radius ** 2
return result
area = area_of_a_circle(3)
print(area)
Working with default parameters
In Python, you can specify default values for function parameters, which will be used if the caller does not provide a value for that parameter. This can be useful if there is a common value that you want to use for a parameter in most cases, but you still want to allow the caller to override it if needed.
To specify a default value for a function parameter, you can include an assignment expression in the parameter list when defining the function
If a value is passed to the function when called, the value passed will override the default vale
PI = 3.142
def area_of_a_circle(radius=2):
result = PI * radius ** 2
return result
area = area_of_a_circle()
print(area)
Working with arguments (*args)
In Python, the *args syntax is used to pass a variable number of arguments to a function. It allows you to pass a variable number of arguments to a function as a tuple.
Here is an example of how to use *args in a function definition:
# Collecting Arguments using
def args_get_bio(*args):
print(args[0])
print(args[1])
print(args[2])
get_bio = args_get_bio(2022, "john", "solomon", 45, "Nexford")
print(get_bio)
Working with keyword arguments (**kwargs)
In Python, the **kwargs syntax is used to pass a variable-length argument dictionary to a function. It allows you to pass a variable number of keyword arguments to a function as a dictionary.
Here is an example of how to use **kwargs in a function definition:
# Collecting Arguments using **kwargs
def kwargs_get_bio(**kwargs):
year = kwargs['year']
first_name = kwargs['first_name']
print(first_name, year)
get_user_bio = kwargs_get_bio(first_name="John", year=2022)
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