创建多个字典时，分块列表抛出“ zip参数2必须支持迭代”

如何解决创建多个字典时，分块列表抛出“ zip参数2必须支持迭代”

为了将请求批量发送，我将一个分块列表转换成多个字典时遇到问题：

fd = open(filename,'r')
sqlFile = fd.read()
fd.close()
commands = sqlFile.split(';')
for command in commands:
    try:
        c = conn.cursor()
        c.execute(command)

        // create a list with the query results with batches of size 100
        for batch in grouper(c.fetchall(),100):
            // This is where the error occurs:
            result = [dict(zip([key[0] for key in c.description],i)) for i in batch]
            # Todo: Send the json with 100 items to API
        
    except RuntimeError:
        print('Error.') 

问题在于，它仅对批次进行一次迭代，并产生以下错误。实际上，行数为167。因此，应该在第一个请求中发送100个项目，而第二次迭代应该包含在第二个请求中发送的67个项目。

TypeError: zip argument #2 must support iteration

解决方法

我通过使用c.rowfactory = makeDictFactory(c)立即制作字典来解决了这个问题：

def makeDictFactory(cursor):
columnNames = [d[0] for d in cursor.description]
def createRow(*args):
    return dict(zip(columnNames,args))
return createRow

def getAndConvertDataFromDatabase:(filename)
fd = open(filename,'r')
sqlFile = fd.read()
fd.close()
commands = sqlFile.split(';')
for command in commands:
    try:
        c = conn.cursor()
        c.execute(command)
        c.rowfactory = makeDictFactory(c)
        data = c.fetchall()
        for batch in [data[x:x+100] for x in range(0,len(data),100)]:
        return postBody(json.dumps(batch,default = myconverter),dataList[filename])
    except RuntimeError:
        print('Error.')