Question

我创建了一个名为目录路径+当前日期和时间的txt文件。发生以下错误：

无法打开文件。强制转换为Unicode：需要字符串或缓冲区，找到NoneType

def create_file(count):
    filename = "countMetrics"
    dir = os.getcwd()

    #print 'Current directory path is-'
    #print dirPath  

    date = datetime.datetime.now()
    now = date.strftime("%Y-%m-%d %H:%M")
    #print 'current date and time is-'
    #print now

    ## date and time representation
    #print "Current date & time " + time.strftime("%c")
    dirPath = os.path.join(dir, filename)
    filenameCreated = dirPath+now+".txt"
    #filenameCreated = dirPath+filename+now+".txt"
    print filenameCreated
    f = openfile(filenameCreated,'a')
    return f
    #writeFile(f,count)


#defining openfunction
def openfile(filename,mode):
    try:
        open(filename,mode)
    except Exception, err:
        print("File cannot be opened.")
        print(str(err))
        return


def readFile(filename):  
    try:
        target = open(filename,'r')
        content=filename.read()     # reading contents of file
        for line in target:
            print content
        target.close()
    except:
        print "File is empty.."
        return


#defining write function    
def writeFile(filename,count):
    try:
        target = openfile(filename,'a')
        target.write(count)
        target.close()
    except Exception, err:
        print("File have no data to be written.")
        print(str(err))
        return

Answer 1

您的openfile函数未返回任何内容。更改它以返回打开的文件描述符，您的代码可能会起作用： - ）

def openfile(filename, mode):
try:
    return open(filename, mode)
except Exception as err:
    print "File cannot be created", err
    return

在主代码中添加一个if来检查是否收到文件描述符。

f = openfile(filenameCreated,'a')
if not f:
    print "No file created"
    return
return f

你的writeFile函数将是这样的：

def writeFile(target, count):
    try:
        target.write(count)
        target.close()
        return 1
    except Exception as err:
        print "Cannot write into the file"
        return 0

因为你的openfile本身会返回一个描述符。你不需要创建另一个。

无法打开文件命名目录路径+文件名+当前日期和时间

1 个答案: