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Инспекция на кода


Кодова интроспекция е способността да се проверяват класове, функции и ключови думи, за да се разбере какво представляват, какво правят и какво знаят.

Python предоставя няколко функции и полезни инструменти за кодова интроспекция.

help()
dir() 
hasattr() 
id() 
type() 
repr() 
callable() 
issubclass() 
isinstance() 
__doc__ 
__name__

Често най-важната функция е help, тъй като с нея може да се открие какво правят останалите функции.

Exercise

Отпечатайте списък с всички атрибути на дадения обект Vehicle.

# 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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