技術標籤：python程式設計從入門到實踐python類

9-4 就餐人數

# 建立餐館類的例項並呼叫
class Restaurant():
	"""一次模擬餐館的簡單嘗試"""
	# 新增一個名為number_served的屬性，並將其預設值設定為0
	def __init__(self, restaurant_name, cuisine_type):
		"""初始化屬性restaurant_name和cuisine_type"""
		self.restaurant_name =
 
 restaurant_name
		self.cuisine_type = cuisine_type
		self.number_served = 0
		
	def describe_restaurant(self):
		"""列印兩項資訊"""
		print("The restaurant's name is " + self.restaurant_name + ".")
		print("The cuisine type of the restaurant is "
 
 + self.cuisine_type + ".")
	
	def open_restaurant(self):
		"""列印一條訊息指出餐館正在營業"""
		print("The restaurant is open.")
	
	def set_number_served(self, number):
		"""設定就餐人數"""
		self.number_served = number
	
	def increment_number_served
 
(self, add):
		"""將就餐人數遞增"""
		self.number_served += add

# 建立一個例項
my_restaurant = Restaurant('Go Believe', 'steamed stuffed bun')
# 列印多少人就餐過
print(my_restaurant.number_served)
# 修改該值並再次列印
my_restaurant.number_served = 20
print(my_restaurant.number_served)
# 呼叫方法並設定一個值
my_restaurant.set_number_served(30)
print(my_restaurant.number_served)
# 呼叫遞增方法向它傳遞該餐館每天可能接待的就餐人數
my_restaurant.increment_number_served(100)
print(my_restaurant.number_served)

9-5 嘗試登入次數

class User():
	"""使用者簡介"""
	def __init__(self, first_name, last_name, age, agenda):
		self.first_name = first_name
		self.last_name = last_name
		self.age = age
		self.agenda = agenda
		self.login_attempts = 0
	
	def describe_user(self):
		"""列印使用者的資訊摘要"""
		print('User: ' + self.first_name + ' ' + self.last_name)
		print('Age: ' + str(self.age))
		print('Agenda: ' + self.agenda + '\n')
	
	def greet_user(self):
		"""向用戶發出個性化的問候"""
		print('Welcome ' + self.first_name.title() + '!\n')
	
	def increment_login_attempts(self):
		"""將屬性login_attempts加1"""
		self.login_attempts += 1
	
	def reset_login_attempts(self):
		"""將屬性login_attempts的值重置為0"""
		self.login_attempts = 0
	

first_user = User('allan', 'poe', 13, 'male')
first_user.increment_login_attempts()
first_user.increment_login_attempts()
print(first_user.login_attempts)
first_user.reset_login_attempts()
print(first_user.login_attempts)

呼叫方法時必須寫括號，不寫括號不會報錯，但是實際上方法並沒有執行。不寫括號輸出為0，0.