[英]How to define 'self' in python script
我只是在學習 python 中的類和方法,我有一個腳本,我不確定它為什么不起作用。 該腳本從控制台接受來自用戶的 integer,然后對於所需的學生帳戶數量,它會詢問用戶的名字、姓氏、年齡和用戶名。 然后應該打印學生列表和他們的默認密碼。 最后,它應該計算並打印輸入學生的平均年齡。 這是我的腳本。
#!/usr/bin/python
def calcAverageAge(age_list):
average=sum(age_list) / len(age_list)
print("The average age of the students is:", average)
def validateAge():
while age < 15 or age > 45:
age=int(input("Age must be between 15 and 45"))
class CIT383Student: # class definition
def __init__(self,first,last,age,username,current_password):#contsructor
self.first_name=first # instantiate object create with first name, last name, age, username, and password
self.last_name=last
self.User_age=age
self.uname=username
self.pw=current_password
def defPassword(self): # Create default password for each user
import time #timestamp for default password
firstChar=self.first_name[0]
lastChar=self.last_name[0]
ts=time.time()
self.defPassword = (firstChar + lastChar + ts) # compute the default password for the user
#def displayUsers(self):
# print(self.first_name, self.last_name, self.User_age, self.uname, self.pw)
age_list = []
student_list =[]
studentNumber = int(input("Please Enter the number of student accounts: "))
for _ in range(studentNumber): #For each student
first = input("please enter the first name of the student: ")
last = input("Please enter the last name of the student: ")
age = input("please enter the age of the student")
username = input("Please enter username of the student")
CIT383Student.defPassword()
student=CIT383Student(first,last,age,username,current_password)
student_list.append(student)
for student in student_list:
CIT383Student.displayUsers()
print("\n")
calcAverageAge()
我收到的錯誤是:
Traceback (most recent call last):
File "filepath", line 36, in <module>
CIT383Student.defPassword(self)
NameError: name 'self' is not defined
對不起,如果這個問題太長了。 我只是難過。 任何幫助將不勝感激。
在第 36 行,您調用
CIT383Student.defPassword()
您必須首先實例化CIT383Student
class。 defPassword()
是一個實例方法,因此期望從實例調用,而您從 class 本身調用它。
您必須先創建 class CIT383Student
的實例,然后才能對其調用defPassword()
,因為defPassword()
不是 static 方法。
c = CIT383Student(first, last, age, username, current_password)
c.defPassword()
student=CIT383Student(first,last,age,username,current_password)
student.defPassword()
current_password = input("Please enter current password")
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