從文件和平均總數

Question

Python 3.x 我試圖讀取一個名爲numbers.txt的文件。它有幾行數字。我需要打印總數和平均數。除此之外，我需要爲IOerror和ValueError使用異常處理。

預先感謝您。我知道有這樣的問題，但建議錯誤了。

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)) 

以供將來參考，因爲這是非常簡單的代碼，你可以谷歌的每個部分分別，你可以拼湊他們。