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Koodin introspektio
Koodin introspektio on kyky tutkia luokkia, funktioita ja avainsanoja ymmärtääkseen, mitä ne ovat, mitä ne tekevät ja mitä ne tietävät.
Python tarjoaa useita funktioita ja työkaluja koodin introspektioon.
help()
dir()
hasattr()
id()
type()
repr()
callable()
issubclass()
isinstance()
__doc__
__name__
Usein tärkein on help-funktio, koska sen avulla voit selvittää, mitä muut funktiot tekevät.
Harjoitus
Tulosta lista annetun Vehicle-objektin kaikista attribuuteista.
# 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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