python之遍历列表中的字符串

如何遍历列表中的字符串，以便将特定值添加到字典中？例如，对于给定的列表，我想将每个项目的价格设置为字典键，将它们各自的项目设置为值。

给定:

list = ["10.99,cheese pizza", "4.99,vanilla milkshake", "4.99,chocolate milkshake"] 

输出(给定一个空字典):

{"10.99": ["cheese pizza"], "4.99": ["vanilla milkshake", "chocolate milkshake"]} 

这是我的尝试:

list = ["10.99,cheese pizza", "4.99,vanilla milkshake", "4.99,chocolate milkshake"] 
 
list = str(list)[1:-1].split(",") 
listofitems = {} 
 
ctr = 0 
while ctr < len(list): 
    listofitems[list[0]] = str(list[ctr]) 
    print listofitems 
    ctr = ctr + 1 

我的输出是这样的:

{"'10.99": "'10.99"} 
{"'10.99": "cheese pizza'"} 
{"'10.99": " '4.99"} 
{"'10.99": "vanilla milkshake'"} 
{"'10.99": " '4.99"} 
{"'10.99": "chocolate milkshake'"} 

我做错了什么？