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Kodeintrospektion
Indsigelse af kode er evnen til at undersøge klasser, funktioner og nøgleord for at forstå, hvad de er, hvad de gør, og hvad de ved.
Python tilbyder flere funktioner og værktøjer til kodeindsigelse.
help()
dir()
hasattr()
id()
type()
repr()
callable()
issubclass()
isinstance()
__doc__
__name__
Ofte er den vigtigste funktion help-funktionen, da du kan bruge den til at finde ud af, hvad andre funktioner gør.
Øvelse
Print en liste over alle attributter for det givne Vehicle-objekt.
# 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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