[已解决]想问一下我这个代码有什么问题？

MIQIWEI · 发表于 2020-8-14 18:37:05

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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))

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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!")

复制代码

跳转到最佳答案楼层

zltzlt · 发表于 2020-8-14 18:42:10

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))

复制代码

MIQIWEI · 发表于 2020-8-14 18:48:14

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))

复制代码

read_scores('empty.txt') 这个test 又出错了~

zltzlt · 发表于 2020-8-14 18:51:00

这个最佳答案由 zltzlt 给出，感谢 zltzlt 的回答。

单击隐藏图章

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!")

复制代码

MIQIWEI · 发表于 2020-8-14 18:53:22

zltzlt 发表于 2020-8-14 18:51

系统说
您必须在代码中捕获FileNotFoundError。

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[已解决]想问一下我这个代码有什么问题？

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