小编hei*_*ato的帖子

我无法弄清楚我在使用Python 2.7编写的代码时遇到的问题.我正在将引用转换为int,但我一直在获得类型异常bad operand type for unary +: 'str'.有人可以帮忙吗？

import urllib2
import time
import datetime

stocksToPull = 'EBAY', 'AAPL'


def pullData(stock):
    try:
        print 'Currently pulling', stock
        print str(datetime.datetime.fromtimestamp(time.time()).strftime('%Y-%m-%d %H:%M:%S'))
        urlToVisit = 'http://chartapi.finance.yahoo.com/instrument/1.0/' + \
            stock + '/chartdata;type=quote;range=3y/csv'
        saveFileLine = stock + '.txt'

        try:
            readExistingData = open(saveFileLine, 'r').read()
            splitExisting = readExistingData.split('\n')
            mostRecentLine = splitExisting[-2]
            lastUnix = mostRecentLine.split(',')[0]
        except Exception, e:
            print str(e)
            time.sleep(1)
            lastUnix = 0

        saveFile = open(saveFileLine, 'a')
        sourceCode = urllib2.urlopen(urlToVisit).read()
        splitSource = sourceCode.split('\n')

        for eachLine in splitSource: …

我被卡住了.我一直在试图弄清楚如何在具有papertrail的模型中包含关联更改(has_many,has_many through).我想调用MyModel.versions.first.changeset并在关联对象上发生的任何更改都包含在.changeset从该版本的对象返回的哈希中.

我添加了版本关联的迁移:

class CreateVersionAssociations < ActiveRecord::Migration
  def self.up
    create_table :version_associations do |t|
      t.integer  :version_id
      t.string   :foreign_key_name, :null => false
      t.integer  :foreign_key_id
    end
    add_index :version_associations, [:version_id]
    add_index :version_associations, [:foreign_key_name, :foreign_key_id], :name => 'index_version_associations_on_foreign_key'
  end

  def self.down
    remove_index :version_associations, [:version_id]
    remove_index :version_associations, :name => 'index_version_associations_on_foreign_key'
    drop_table :version_associations
  end
end


class AddTransactionIdColumnToVersions < ActiveRecord::Migration
  def self.up
    add_column :versions, :transaction_id, :integer
    add_index :versions, [:transaction_id]
  end

  def self.down
    remove_index :versions, [:transaction_id]
    remove_column :versions, :transaction_id
  end
end …