我正在macOS Sierra上运行Python 3.5。我有一个系统,我将类的实例作为列表存储在文件中(使用dill
),然后将它们解压以执行操作、添加到它们、删除它们等等。问题是,当我将localData
列表(加载的类列表)设置为从文件加载的数据时,我无法与之交互
这是我的代码:
import dill as pickle
...
dataFileLocation = "./data.ehd"
localData = []
class eventClass:
def __init__(self, name, items, organisers):
self.name = name
self.items = items
self.organisers = organisers
loadData()
self.id = len(localData)
def loadData():
try:
dataFile = open(dataFileLocation, "rb")
localData = pickle.load(dataFile)
return localData
except (IOError, EOFError):
return False
def newEvent(name, items, organisers):
loadData()
localData.append(eventClass(name, items, organisers))
with open(dataFileLocation, "wb+") as dataFile:
pickle.dump(localData, dataFile)
...
def getInfo(name):
loadData()
for event in localData:
if event.name == name:
organisers = ""
for organiser in event.organisers:
organisers = (organisers + ", " + str(organiser))
items = ""
for item in event.items:
items = (items + ", " + str(item))
items = items[2:]
organisers = organisers[2:]
print("Name: " + str(event.name))
print("Internal ID: " + str(event.id))
print("Items: " + items)
print("Organisers: " + organisers)
def prompt():
task = input("EventHorizon >")
execute(task)
prompt()
def execute(task):
task = task.lower().split(" ")
if task[0] == ("newevent"):
name = task[1]
items = task[2].split(":")
organisers = task[3].split(":")
newEvent(name, items, organisers)
elif task[0] == ("dropevent"):
name = task[1]
dropEvent(name)
elif task[0] == ("getinfo"):
name = task[1]
getInfo(name)
elif task[0] == ("quit") or task[0] == ("exit"):
quit()
elif task[0] == ("loaddata"):
loadData()
loadData()
prompt()
以下是我正在做的事情(从一个空白的data.ehd开始):
bash-3.2$ python3 main.py
EventHorizon >newEvent myEvent myItem myOrganiser
EventHorizon >newEvent myEvent2 myItem2 myOrganiser2
EventHorizon >getInfo myEvent
Name: myevent
Internal ID: 0
Items: myitem
Organisers: myorganiser
EventHorizon >getInfo myEvent2
Name: myevent2
Internal ID: 1
Items: myitem2
Organisers: myorganiser2
EventHorizon >exit
bash-3.2$ python3 main.py
EventHorizon >loadData
EventHorizon >getInfo myEvent
EventHorizon >getInfo myEvent2
没有显示事件属性的输出。我还从一个data.ehd
文件开始测试了这一点,该文件不包含数据(写入它很好)
为什么会发生这种情况? 任何帮助都将不胜感激。谢谢
感谢@juanpa.arrivillaga,这个问题已经解决了
问题是
loadData
内的localData
变量只是局部变量,因此主代码中的localData
没有更新这是通过在开始时修改
loadData
将localData
定义为全局来修复的。修改的loadData
是:相关问题 更多 >
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