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[英]Why do I keep getting AttributeError: 'module' object has no attribute
[英]Why do I keep getting the error: AttributeError: 'int' object has no attribute 'subject'
因此,我正在创建一个代码,通过指定特定课程,学生接下来可以学习哪些共同必备条件以及哪些课程。 例如,如果用户输入“ECE 256”,则并存条件应该是 ECE 256L,他们可以参加的下一个课程是 ECE 304。
List.print_list()
文件/Users/marleneterrones/Dropbox/ECE 480 Group/linked list/node.py
,第 45 行,在,
print_list result = result + str(dataObj.subject) AttributeError: 'str' object has no attribute 'subject'
class Node:
def __init__(self, subject=None, corec=[] , next_class=[]):
self.subject = subject
self.corec = corec
self.next_class = next_class
class LinkedList:
def __init__(self):
self.firstNode = Node(None, None, None)
self.lastNode = self.firstNode
self.size = 0
def add(self, subject,corec):
"""Add a node to the list"""
node = Node(subject , corec ,None)
node.subject = subject;
node.corec = corec;
if self.firstNode.subject == None:
self.firstNode = node
self.lastNode = node
else:
self.lastNode.next_class = node
self.lastNode = node
self.size += 1
def print_list(self):
"""prints whats ever in the array """
result = ""
currentNode = Node( None,None, None)
currentNode = self.firstNode
i = 0
result = result + "("
while currentNode != None:
if i > 0:
result = result + ","
dataObj = currentNode.subject
dataObj2 = currentNode.corec
if dataObj != None:
result = result + str(dataObj.subject)
if dataObj2 != None:
result = result + str(dataObj2.corec)
currentNode = currentNode.next_class
i = i + 1
result = result + ")"
return result
dataObj = currentNode.subject
使dataObj
可能是int
,然后dataObj.subject
导致这样的错误。 你可能只是想要
result = result + str(dataObj)
您的代码段中有一些不必要的代码,例如:
node = Node(subject , corec ,None) node.subject = subject; node.corec = corec;
后两行不是必需的,因为您已经使用subject
和corec
初始化了node
。
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