[英]Why doesn't my Python script recognize a class from an imported module?
collection.py
import sys
import os
import pymongo
from pymongo import MongoClient
class Collection():
"""returns a collection curser from mongodb"""
client = MongoClient()
def __init__(self, db, collection_name):
self.db = db
self.collection_name = collection_name
def getCollection(self):
data_base = getattr(self.client, self.db)
collObject = getattr(data_base, self.collection_name)
return collObject
main.py
import sys
import os
import collection
def main():
pass
if __name__ == '__main__':
print"Begin Main"
agents = Collection('hkpr_restore','agents')
print "agents is" , agents
這些文件在同一目錄中。 但是,當我運行main.py
,出現錯誤:
Begin Main
Traceback (most recent call last):
File "main.py", line 23, in <module>
agents = Collection('hkpr_restore','agents')
NameError: name 'Collection' is not defined
根據我的閱讀,如果文件位於同一目錄中,那么我需要做的就是使用import collection
。
我想念什么嗎?
您只導入了collection
,而不是Collection
。
from collection import Collection
,或在實例化時使用完全限定名稱: agents = collection.Collection('hkpr_restore','agents')
。
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