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コード内省
コードインスペクションは、クラス、関数、キーワードを調べ、それらが何であるか、何をするのか、そして何を知っているのかを知る能力です。
Pythonはいくつかの関数やユーティリティを提供しており、コードインスペクションを可能にしています。
help()
dir()
hasattr()
id()
type()
repr()
callable()
issubclass()
isinstance()
__doc__
__name__
しばしば最も重要なのはhelp関数です。なぜなら、これを使って他の関数が何をするのかを調べることができるからです。
Exercise
与えられたVehicleオブジェクトのすべての属性のリストを出力してください。
# Use the help function to see what each function does.
# Delete this when you are done.
help(dir)
help(hasattr)
help(id)
# Define the Vehicle class.
class Vehicle:
name = ""
kind = "car"
color = ""
value = 100.00
def description(self):
desc_str = "%s is a %s %s worth $%.2f." % (self.name, self.color, self.kind, self.value)
return desc_str
# Print a list of all attributes of the Vehicle class.
# Your code goes here
# Define the Vehicle class
class Vehicle:
name = ""
kind = "car"
color = ""
value = 100.00
def description(self):
desc_str = "%s is a %s %s worth $%.2f." % (self.name, self.color, self.kind, self.value)
return desc_str
# Print a list of all attributes of the Vehicle class.
print(dir(Vehicle))
test_output_contains("['__doc__', '__module__', 'color', 'description', 'kind', 'name', 'value']")
test_student_typed("print")
success_msg("Very nice!")
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