从文件和平均总数

Question

Python 3.x 我试图读取一个名为numbers.txt的文件。它有几行数字。我需要打印总数和平均数。除此之外，我需要为IOerror和ValueError使用异常处理。

预先感谢您。我知道有这样的问题，但建议错误了。

def main(): 
    total = 0.0 
    length = 0.0 
    average = 0.0 
    try: 
     filename = raw_input('Enter a file name: ') 
     infile = open(filename, 'r') 
     for line in infile: 
      print (line.rstrip("\n")) 
      amount = float(line.rstrip("\n")) 
      total += amount 
      length = length + 1 
     average = total/length 
     infile.close() 
     print ('There were', length, 'numbers in the file.') 
     print (format(average, ',.2f')) 
    except IOError: 
     print ('An error occurred trying to read the file.') 
    except ValueError: 
     print ('Non-numeric data found in the file') 
    except: 
     print('An error has occurred') 

Answer 1

with open('numbers.txt', 'r') as my_file: 
    try: 
     data = [float(n) for n in my_file.read().split()] 
    except (IOError, ValueError): 
     data = [] 
total = sum(data) 
average = total/len(data) 
print('Numbers: {nums}\nTotal: {total}\nAverage: {average}'.format(nums = data, total = total, average = average)) 

以供将来参考，因为这是非常简单的代码，你可以谷歌的每个部分分别，你可以拼凑他们。