局部变量“服务器的分配

def websvc(currency): 
    db = MySQLdb.connect("localhost", "root", "aqw", "PFE_Project") 
    cursor = db.cursor() 
    sql = "SELECT * FROM myform_composantsserveur" 

    try: 
     cursor.execute(sql) 
     results = cursor.fetchall() 
     currency_in = currency 
     req = urllib2.urlopen('http://rate-exchange.appspot.com/currency?from=USD&to=%s') % (currency_in) 
     req1 = req.read() 
     rate = int(req1['rate']) 
     # rate = 0.77112893299999996 

     servers = [] 
     for row in results: 
      result = {} 
      result['1'] = row[1] 
      result['3'] = int(row[2]) 
      result['4'] = int(row[3]) 
      result['5'] = int(row[4]) 
      result['6'] = row[5] 
      result['7'] = int(row[6]) 
      result['8'] = row[7] 
      result['9'] = row[8] 
      p = rate * calculations_metric (int(row[2]), int(row[3]), int(row[4]), int(row[6]), row[7]) 
      result['2'] = p 
      keys = result.keys() 
      keys.sort() 
      servers.append(result) 

    except: 
     print "Error: unable to fetch data" 
    db.close() 
    return servers

之前引用但我有这个错误而编译代码：局部变量“服务器的分配

异常类型：UnboundLocalError

异常值：赋值之前引用局部变量 “服务器”

异常位置：/ home/amine/PFE目录/ mysite1/myform/webservice.py in websvc，第43行Python可执行文件：/usr/bin/python2.7

这个代码正常工作之前，我在此功能

来源

2013-03-14 Imoum

什么线是错误的？ – interjay 2013-03-14 09:40:39

添加完整的错误以及FUNC代码与该错误 – 2013-03-14 09:42:29

镭石光电线“返回服务器”中提到 – Imoum 2013-03-14 09:44:10

您的代码不能添加参数来达到服务器的初始化，这就是为什么你得到错误。只需在try..except之前移动初始化即可。改变这种方式：

def websvc(currency): 
    db = MySQLdb.connect("localhost", "root", "aqw", "PFE_Project") 
    cursor = db.cursor() 
    sql = "SELECT * FROM myform_composantsserveur" 
    servers = [] 

    try: 
     cursor.execute(sql) 
     results = cursor.fetchall() 
     currency_in = currency 
     req = urllib2.urlopen('http://rate-exchange.appspot.com/currency?from=USD&to=%s') % (currency_in) 
     req1 = req.read() 
     rate = int(req1['rate']) 
     # rate = 0.77112893299999996 

     for row in results: 
      result = {} 
      result['1'] = row[1] 
      result['3'] = int(row[2]) 
      result['4'] = int(row[3]) 
      result['5'] = int(row[4]) 
      result['6'] = row[5] 
      result['7'] = int(row[6]) 
      result['8'] = row[7] 
      result['9'] = row[8] 
      p = rate * calculations_metric (int(row[2]), int(row[3]), int(row[4]), int(row[6]), row[7]) 
      result['2'] = p 
      keys = result.keys() 
      keys.sort() 
      servers.append(result) 

    except: 
     print "Error: unable to fetch data" 
    db.close() 
    return servers

来源

2013-03-14 10:11:09

我看到了问题，现在你已经编辑它添加缺少的部分。这是异常处理程序。

如果在try之后和servers=[]之前有错误，它将跳转到except子句，然后看到return servers并失败。

您可能需要使用list()，而是采用了dict()来模拟列表...

来源

2013-03-14 10:12:09 gecko

局部变量“服务器的分配

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