[已解决]想问一下我这个代码有什么问题？

MIQIWEI

我没懂最后代码有什么问题  它测试都是对的 但是最后给出的结果是这个（Expected 12 test results, got 3. Perhaps excessive output or error in question? 预期有12个测试结果，得到3个。也许输出过多或有问题？）


考虑以下功能：
def read_scores(filename):
    input_file = open(filename, "r")
    scores = input_file.read().split()
    numbers = [float(score) for score in scores if float(score) >= 0 ]
    input_file.close()
    number_of_marks = len(numbers)
    total_marks = sum(numbers)
    print("There are {} score(s).".format(number_of_marks))
    print("The total is {:.2f}.".format(total_marks))
    print("The average is {:.2f}.".format(total_marks/number_of_marks))

read_scores（filename）函数使用文件名作为参数，从文件中读取所有分数，并显示它们的总和和平均值。您可以假定分数由空格分隔，并且文本文件包含未指定数量的分数。

修改上面的函数，并使用try ... except块来处理可能发生的任何异常。该功能应忽略任何负分数。如果参数文件名类型无效，则函数应显示“ERROR: Invalid input!”。如果参数文件名是一个空字符串，该函数应打印一条错误消息“ERROR: Invalid filename!”。如果无法打开该文件，则该功能应显示“ERROR: The file ... does not exist.”。其中...表示文件名。如果文件包含任何无效值，该函数应打印一条错误消息“ERROR: The input file contains invalid values.”。注意：如果可以打开文件，请记住正确关闭文件。


javascript:;

import os
import sys
def read_scores(filename):
    try:
        file_name,file_extension = os.path.splitext(filename)
        if(file_name==""):
            print("Error: Invalid filename!")
            sys.exit()
        input_file = open(filename,"r")
        scores = input_file.read().split()
        try:
            numbers = [float(score) for score in scores if float(score)>=0]
        except ValueError:
            print("Error: The input file contains invalid values")
            sys.exit()
        input_file.close()
        number_of_marks = len(numbers)
        total_marks = sum(numbers)
        average = 0
        try:
            average = total_marks/number_of_marks
        except ArithmeticError:
            print("Error: No positive scores in the input file.")
            sys.exit()
        print("There are {} score(s).".format(number_of_marks))
        print("The total is {:.2f}.".format(total_marks))
        print("The average is {:.2f}.".format(average))
    except TypeError:
        print("Error: Invalid input!")
    except FileNotFoundError:
        print("Error: The file '{}{}' does not exist.".format(file_name,file_extension))

最佳答案

月排行榜 / 总排行榜

zltzlt

2020-8-14 18:51:00

import os
import sys
def read_scores(filename):
    try:
        file_name,file_extension = os.path.splitext(filename)
        if(file_name==""):
            print("Error: Invalid filename!")
            sys.exit()
        try:
            input_file = open(filename,"r")
        except OSError:
            print("Error: The file '{}{}' does not exist.".format(file_name, file_extension))
            return
        scores = input_file.read().split()
        try:
            numbers = [float(score) for score in scores if float(score)>=0]
        except ValueError:
            print("Error: The input file contains invalid values")
            sys.exit()
        input_file.close()
        for i in numbers:
            if i < 0:
                print("Error: No positive scores in the input file.")
                return
        number_of_marks = len(numbers)
        total_marks = sum(numbers)
        average = 0
        average = total_marks/number_of_marks
        print("There are {} score(s).".format(number_of_marks))
        print("The total is {:.2f}.".format(total_marks))
        print("The average is {:.2f}.".format(average))
    except TypeError:
        print("Error: Invalid input!")

跳转到最佳答案楼层

zltzlt

这样试试：

import os
import sys
def read_scores(filename):
    try:
        file_name,file_extension = os.path.splitext(filename)
        if(file_name==""):
            print("Error: Invalid filename!")
            sys.exit()
        input_file = open(filename,"r")
        scores = input_file.read().split()
        try:
            numbers = [float(score) for score in scores if float(score)>=0]
        except ValueError:
            print("Error: The input file contains invalid values")
            sys.exit()
        input_file.close()
        for i in numbers:
            if i < 0:
                print("Error: No positive scores in the input file.")
        number_of_marks = len(numbers)
        total_marks = sum(numbers)
        average = 0
        average = total_marks/number_of_marks
        print("There are {} score(s).".format(number_of_marks))
        print("The total is {:.2f}.".format(total_marks))
        print("The average is {:.2f}.".format(average))
    except TypeError:
        print("Error: Invalid input!")
    except FileNotFoundError:
        print("Error: The file '{}{}' does not exist.".format(file_name,file_extension))

MIQIWEI

zltzlt 发表于 2020-8-14 18:42
这样试试：

import os
import sys
def read_scores(filename):
    try:
        file_name,file_extension = os.path.splitext(filename)
        if(file_name==""):
            print("ERROR: Invalid filename!")
            sys.exit()
        input_file = open(filename,"r")
        scores = input_file.read().split()
        try:
            numbers = [float(score) for score in scores if float(score)>=0]
        except ValueError:
            print("ERROR: The input file contains invalid values")
            sys.exit()
        input_file.close()
        for i in numbers:
            if i < 0:
                print("ERROR: No positive scores in the input file.")
        number_of_marks = len(numbers)
        total_marks = sum(numbers)
        average = 0
        average = total_marks/number_of_marks
        print("There are {} score(s).".format(number_of_marks))
        print("The total is {:.2f}.".format(total_marks))
        print("The average is {:.2f}.".format(average))
    except TypeError:
        print("ERROR: Invalid input!")
    except FileNotFoundError:
        print("ERROR: The file '{}{}' does not exist.".format(file_name,file_extension))

read_scores('empty.txt') 这个test 又出错了~

zltzlt

import os
import sys
def read_scores(filename):
    try:
        file_name,file_extension = os.path.splitext(filename)
        if(file_name==""):
            print("Error: Invalid filename!")
            sys.exit()
        try:
            input_file = open(filename,"r")
        except OSError:
            print("Error: The file '{}{}' does not exist.".format(file_name, file_extension))
            return
        scores = input_file.read().split()
        try:
            numbers = [float(score) for score in scores if float(score)>=0]
        except ValueError:
            print("Error: The input file contains invalid values")
            sys.exit()
        input_file.close()
        for i in numbers:
            if i < 0:
                print("Error: No positive scores in the input file.")
                return
        number_of_marks = len(numbers)
        total_marks = sum(numbers)
        average = 0
        average = total_marks/number_of_marks
        print("There are {} score(s).".format(number_of_marks))
        print("The total is {:.2f}.".format(total_marks))
        print("The average is {:.2f}.".format(average))
    except TypeError:
        print("Error: Invalid input!")

MIQIWEI

zltzlt 发表于 2020-8-14 18:51

系统说
您必须在代码中捕获FileNotFoundError。