在python中使用獲取總功能

Question

任何人都可以幫助我完成此代碼，我需要計算文件中包含的數字的總數，並使用get_total函數將答案打印到屏幕上。我有其他的代碼運行良好我只是不知道如何將數字添加在一起，並顯示答案。我使用python 3.3.2

def main(): 

    filename = input("Welcome, please enter file name:\t") 
    menu() 
    choice= int(input("Enter menu choice:\t")) 

    while choice != 5: 
     #get file choice from user 
     if choice == 1: 
      #create file 
      create(filename) 
     elif choice == 2: 
      #read file 
      read(filename) 
     elif choice == 3: 
      #append file 
      append(filename) 
     elif choice == 4: 
      #get total 
      get_total(filename) 

     choice = int(input("Enter menu choice:\t")) 

    print("\nApplication Complete") 

def menu(): 
    #user chooses a number from menu 
    print("Choose a number to continue:\t\n\ 
    Select 1 to create a file\n\ 
    Select 2 to read a file\n\ 
    Select 3 to append to a file\n\ 
    Select 4 to calculate the total of a file\n\ 
    Select 5 to exit programme") 

def create(filename): 

    #create file name 
    outfile = open(filename,"w") 
    again = "y" 

     while again == "y": 

     try: 
      #user inputs integer 
      num = int(input("Input number:\t")) 
      outfile.write(str(num)+"\n") 
      #asks user whether they want to continue or not 
      again = input("Enter y to continue:\t") 

     #if an error occurs 
     except ValueError: 
         print("An error occured,please enter an integer:\t") 

     except: 
         print("An undetermined error occurred") 
     #close file 
     outfile.close() 

def read(filename): 

    print("\nReading File") 

    try: 
     #read integers entered onto file 
     infile = open(filename,"r") 

     for line in infile: 

      number = int(line) 
      print(number) 

    except IOError: 
      print("An error occured trying to read") 
      print("the file", filename) 

    except: 
      print("An undefined error occurred") 

def append(filename): 

    print("\nAppending to file") 

    #user enters integers again 
    outfile = open(filename, "a") 
    again = "y" 

    while again == "y": 

     try: 
      num = int(input("Input number to append to file:\t")) 
      outfile.write(str(num)+"\n") 
      again = input ("Enter y to continue:\t") 

     except ValueError: 
       print("an error occured please an integer") 
     except: 
       print("an undefined error occured") 


     outfile.close() 

def get_total(filename): 

    print("\nGetting total numbers contained in file") 

    try: 
     #user inputs integer 
     num = int(input("Input number:\t")) 
     outfile.write(str(num)+"\n") 
     #asks user whether they want to continue or not 
     again = input("Enter y to continue:\t") 

    except IOError: 
      print("An error occured trying to read") 
      print("the file", filename) 

    except: 
      print("An undefined error occurred")   

#call main 
main() 

感謝您的幫助

Answer 1

您將需要創建一個變量來保存所有你正在閱讀的數字：

def get_total(filename): 
    total_sum = 0 # running total 
    print("\nGetting total numbers contained in file") 

    try: 
     #user inputs integer 
     num = int(input("Input number:\t")) 
     outfile.write(str(num)+"\n") 
     total_sum += num 
     #asks user whether they want to continue or not 
     again = input("Enter y to continue:\t") 

    except IOError: 
      print("An error occured trying to read") 
      print("the file", filename) 

    except: 
      print("An undefined error occurred") 
    # prints out the total after the loop 
    print("The total {}".format(total_sum)) 

Answer 2

import re 
def get_total(filename): 

    print("\nGetting total numbers contained in file") 
    num = int(input("Input number:\t")) 
    f = open(fileName) 
    found = 0 
    for line in f: 
     for matchNum in re.findall(r'[0-9]+',line): 
     if matchNum == str(num): 
      found = found + 1 
    print("\nNo. of occurrences of num in file :: ",found  

希望這可以解決您的問題。

Answer 3

的代碼塊將是您的要求有所幫助：

def get_total(filename): 
total_sum = 0 
print("Calculating total of the numbers contained in file") 
f = open(filename) 
try: 
    #read inputs integer 
    for line in f: 
     #split the string on whitespace, return a list of numbers 
     # (as strings) 
     numbers_str = line.split() 
     #convert numbers to int 
     numbers_int = [int(x) for x in numbers_str] 

     total_sum=sum(numbers_int) 

except IOError: 
     print("An error occured trying to read") 
     print("the file", filename) 

except: 
     print("An undefined error occurred") 
# prints out the total after the loop 
print("The total {}".format(total_sum))