我目前正在使用Flask Framework进行REST调用。我一路上遇到了一些错误,我无法弄清楚它们为什么会发生(尽管如此)。如下所示的错误:REST调用异常
[2016-09-20 18:53:26,486] ERROR in app: Exception on /Recommend [GET]
Traceback (most recent call last):
File "/anaconda/lib/python2.7/site-packages/flask/app.py", line 1988, in wsgi_app
response = self.full_dispatch_request()
File "/anaconda/lib/python2.7/site-packages/flask/app.py", line 1641, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/anaconda/lib/python2.7/site-packages/flask_cors/extension.py", line 161, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/anaconda/lib/python2.7/site-packages/flask_api/app.py", line 97, in handle_user_exception
for typecheck, handler in chain(blueprint_handlers.items(), app_handlers.items()):
AttributeError: 'tuple' object has no attribute 'items'
127.0.0.1 - - [20/Sep/2016 18:53:26] "GET /Recommend HTTP/1.1" 500 -
这里是我已经建立了代码:
from flask import request, jsonify
from flask_api import FlaskAPI
from flask_cors import CORS
from sets import Set
from collections import defaultdict
import itertools
import copy
app = FlaskAPI(__name__)
CORS(app)
content = None
class Apriori:
def __init__(self):
self.no_of_transactions = None
self.min_support = 0.5
self.min_confidence = 0.75
self.transactions = {}
self.set_of_items = set()
self.frequencies = {}
self.frequent_itemsets_of_order_n = {}
self.association_rules = {}
def createPowerSet(self,s):
powerset = set()
for i in xrange(2**len(s)):
subset = tuple([x for j,x in enumerate(s) if (i >> j) & 1])
if len(subset) == 0:
pass
elif len(subset) == 1:
powerset.add(subset[0])
else:
powerset.add(subset)
return powerset
def createFrequentItemSets(self,set_of_items,len):
frequent_itemsets = set(itertools.combinations(set_of_items, len))
for i in list(frequent_itemsets):
tempset = set(i)
self.frequencies[i] = 0
for k, v in self.transactions.iteritems():
if tempset.issubset(set(v)):
self.frequencies[i] += 1
if float(self.frequencies[i])/self.no_of_transactions < self.min_support:
frequent_itemsets.discard(i)
return frequent_itemsets
def mineAssociationRules(self,frequent_itemset):
s = set(frequent_itemset)
subs = list(self.createPowerSet(s))
for each in subs:
if sorted(tuple(set(each))) == sorted(tuple(s)):
continue
if len(set(each))==1:
antecedent = list(set(each))[0]
elif len(set(each))>1:
antecedent = tuple(set(each))
if len(s.difference(set(each)))==1:
consequent = list(s.difference(set(each)))[0]
elif len(s.difference(set(each)))>1:
consequent = tuple(s.difference(set(each)))
AuC = tuple(s)
if float(self.frequencies[AuC])/self.frequencies[antecedent] >= self.min_confidence:
if antecedent in self.association_rules:
pass
else:
if type(antecedent) is tuple:
antecedent = (",").join(antecedent)
if type(consequent) is tuple:
consequent = (",").join(consequent)
self.association_rules[antecedent] = consequent
def implement(self,transactions):
#for i in range(0,self.no_of_transactions):
for i in range(0,len(transactions)):
self.transactions["T"+str(i)] = defaultdict(list)
self.transactions["T"+str(i)] = transactions[i].split(',')
self.set_of_items = self.set_of_items.union(Set(self.transactions["T"+str(i)]))
for i in list(self.set_of_items):
self.frequencies[i] = 0
for k, v in self.transactions.iteritems():
if i in v:
self.frequencies[i] = self.frequencies[i] + 1
if float(self.frequencies[i])/self.no_of_transactions < self.min_support:
self.set_of_items.discard(i)
self.frequent_itemsets_of_order_n[1] = self.set_of_items
l = 1
reps = copy.deepcopy(self.set_of_items)
while True:
l += 1
result = self.createFrequentItemSets(self.set_of_items, l)
if len(result) == 0:
break
self.frequent_itemsets_of_order_n[l] = result
reps = copy.deepcopy(self.frequent_itemsets_of_order_n[l])
l = l-1
while l>2:
for each in self.frequent_itemsets_of_order_n[l]:
self.mineAssociationRules(each)
l = l-1
@app.route('/Recommend')
def FindAssociations():
transactions = ["A,C,D,F,G","A,B,C,D,F","C,D,E","A,D,F","A,C,D,E,F","B,C,D,E,F,G"]
apr = Apriori()
apr.implement(transactions)
return jsonify(rules=apr.association_rules)
if __name__ == "__main__":
app.run(port=5000)
我没有运行在网络上发现了一些示例代码,并建立了基于这些脚本以上脚本。他们工作得很好。我建立的这个类是基于我之前建立的另一个python程序,它运行良好。我应该从另一个脚本导入类而不是在这里创建它?
这可能是[已知的bug](https://github.com/tomchristie/flask-api/issues/61)? –
'GET/Recommend HTTP/1.1“500'你是否只在服务器出现错误时才得到它? –
@saurabh baid:当我构建了一个函数来调用类函数时,出现了这个错误,如下所示。工作正常,否则,当我执行其他例子 –