UnboundLocalError:在赋值fetchProcess错误之前引用了局部变量'ext‘

Question

我正在尝试获取和处理数据，我创建了两个函数fetch()，fetchProcess() fetch()如下所示

def fetch():
    root= tk.Tk()
    root.withdraw()
    filepath =filedialog.askopenfilename(filetypes = (("trace files","*.din"),("out files",".out")))
    file=open(filepath)
    file_path = file.name
    ext= os.path.splitext(file_path)
    print(ext[1])
    readData=file.readlines()
    print("Enter the inputs in following order: cache size only integer(no kb),block size, associativity, cache type=1 for combined and 0 for split,prefetcher buffer size,confidence")
    print("for example: python main.py 32 8 1 0 1 2")
    cacheSize= int(sys.argv[1]) #multiply by 1024 to convert into KB
    cacheSize = cacheSize*1024
    blockSize = int(sys.argv[2]) #For block size
    associativity= int(sys.argv[3]) #for associativity
    cacheType= int(sys.argv[4]) #for cache type 1 for combined and 0 for split
    prefetchBuffer= float(sys.argv[5])
    prefetchBuffer=prefetchBuffer*1024
    confidence= int(sys.argv[6])

    # read line and split data and other intialization
    cacheArray = [[0] * associativity] * int(cacheSize / (blockSize * associativity))  #declaring list for cache array 
    lruArray = [[0] * associativity] * int(cacheSize / (blockSize * associativity))  # declaring list for lru
    instr=[] # declaring list for seperate instruction and data cache
    data=[]
    combined=[] # declaring list for combined cache
    prefetch=[]*int(prefetchBuffer) # declaring list for prefetch buffer
    missData =[]
    return ext,readData,cacheSize,blockSize,associativity,cacheType,prefetchBuffer,confidence,cacheArray,lruArray,instr,data,combined,prefetch,missData

fetchProcess代码如下：

def fetchProcess():
    ext,readData,cacheSize,blockSize,associativity,cacheType,prefetchBuffer,confidence,cacheArray,lruArray,instr,data,combined,prefetch,missData=fetch(ext,readData,cacheSize,blockSize,associativity,cacheType,prefetchBuffer,confidence,cacheArray,lruArray,instr,data,combined,prefetch,missData)
    for read in readData:
        split = read.split(' ')
    if ext[1] ==".din":
        label = int(split[0], 10) 
        addr = int(split[1], 16) # convert hexadecimal to decimal
        switch(label)

        return addr
    else:
        addr = int(data[2], 16)
        data.append(addr)
        return addr
        # if count == 4000000:  # limiting the iteration to 4 million as mentioned in the question
        #     # break

最后，我逐个调用fetch()等函数，然后调用fetchProcess()；但它给我的错误是UnboundLocalError:在赋值之前引用的局部变量'ext‘。我是python新手，有人能帮我改正错误吗?谢谢

Answer 1

在fetchProcess函数中，您需要调用

ext,readData,cacheSize,blockSize,associativity,cacheType,prefetchBuffer,confidence,cacheArray,lruArray,instr,data,combined,prefetch,missData=fetch()

不

ext,readData,cacheSize,blockSize,associativity,cacheType,prefetchBuffer,confidence,cacheArray,lruArray,instr,data,combined,prefetch,missData=fetch(ext,readData,cacheSize,blockSize,associativity,cacheType,prefetchBuffer,confidence,cacheArray,lruArray,instr,data,combined,prefetch,missData)