Question

目前我正在做这个由以下几点做的小事：

输入必须是键盘上的交互式。您将为12名学生提供意见。
您将输入学生的姓名和平均成绩。学生不能进入平均值低于零或高于100.您的程序必须引发并处理异常如果发生这种情况
将所有输出写入名为grades.txt
关闭输出文件。
打开文件grades.txt进行输入。
如果找不到文件，您的程序将引发并处理异常。
从文件中读取所有记录并显示它们。

我有这个到目前为止，但我不能使它工作。我该怎么办？

outfile = open('grades.txt', 'w')


def Main():
    print('Please make the Student List: ')
    Input()
     def Input():
#STUDENT INPUT +++++++++++++++++++++++++
    print()
    Name1 = input("Enter your First Name: ")
    LName1 = input("Enter your Last Name: ")
    Grade1 = input("Enter your Grades: ")
    try:
         if Grade1 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade1 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName1) + ',' + str(Name1)+ ': ' + str(Grade1) + '\n')   

# ++++++++++++++++++++++++++++++++       
    print()
    Name2 = input("Enter your First Name: ")
    LName2 = input("Enter your Last Name: ")
    Grade2 = input("Enter your Grades: ")
    try:
         if Grade2 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade2 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName2) + ',' + str(Name2)+ ': ' + str(Grade2) + '\n')   

# +++++++++++++++++++++

    print()
    Name3 = input("Enter your First Name: ")
    LName3 = input("Enter your Last Name: ")
    Grade3 = input("Enter your Grades: ")
    try:
         if Grade3 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade3 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName3) + ',' + str(Name3)+ ': ' + str(Grade3) + '\n')   

# +++++++++++++++++
    print()
    Name4 = input("Enter your First Name: ")
    LName4 = input("Enter your Last Name: ")
    Grade4 = input("Enter your Grades: ")
    try:
         if Grade4 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade4 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName4) + ',' + str(Name4)+ ': ' + str(Grade4) + '\n')   

# +++++++++++++++++
    print()
    Name5 = input("Enter your First Name: ")
    LName5 = input("Enter your Last Name: ")
    Grade5 = input("Enter your Grades: ")
    try:
         if Grade5 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade5 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName5) + ',' + str(Name5)+ ': ' + str(Grade5) + '\n')   

# ++++++++++++++++++++++++
    print()
    Name6 = input("Enter your First Name: ")
    LName6 = input("Enter your Last Name: ")
    Grade6 = input("Enter your Grades: ")
    try:
         if Grade6 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade6 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName6) + ',' + str(Name6)+ ': ' + str(Grade6) + '\n')   

# ++++++++++++++++++++

    print()
    Name7 = input("Enter your First Name: ")
    LName7 = input("Enter your Last Name: ")
    Grade7 = input("Enter your Grades: ")
    try:
         if Grade7 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade7 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName7) + ',' + str(Name7)+ ': ' + str(Grade7) + '\n')   

# ++++++++++++++++++++

    print()
    Name8 = input("Enter your First Name: ")
    LName8 = input("Enter your Last Name: ")
    Grade8 = input("Enter your Grades: ")
    try:
         if Grade8 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade8 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName8) + ',' + str(Name8)+ ': ' + str(Grade8) + '\n')   

# ++++++++++++++++++++

    print()
    Name9 = input("Enter your First Name: ")
    LName9 = input("Enter your Last Name: ")
    Grade9 = input("Enter your Grades: ")
    try:
         if Grade9 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade9 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName9) + ',' + str(Name9)+ ': ' + str(Grade9) + '\n')   

# ++++++++++++++++++
    print()
    Name10 = input("Enter your First Name: ")
    LName10 = input("Enter your Last Name: ")
    Grade10 = input("Enter your Grades: ")
    try:
         if Grade10 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade10 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName10) + ',' + str(Name10)+ ': ' + str(Grade10) + '\n')   

# ++++++++++++++++++++++++
    print()
    Name11 = input("Enter your First Name: ")
    LName11 = input("Enter your Last Name: ")
    Grade11 = input("Enter your Grades: ")
    try:
         if Grade11 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade11 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName11) + ',' + str(Name11)+ ': ' + str(Grade11) + '\n')   

# +++++++++++++++++++++
    print()
    Name12 = input("Enter your First Name: ")
    LName12 = input("Enter your Last Name: ")
    Grade12 = input("Enter your Grades: ")
    try:
         if Grade12 > 100:
             print ("Oops!  That was not valid answer.")
             Input()

         elif Grade12 <= 0:
             print ("Oops!  That was not valid answer.")
             Input()

    except:
        outfile.write(str(LName12) + ',' + str(Name12)+ ': ' + str(Grade12) + '\n')   

# +++++++++++++       

    outfile.close()
    Open()
     def Open():
    try:
        infile = open("grades.txt", "w")

    except: print("Error: can't find file or read data")

    line1 = infile.readline()
    line2 = infile.readline()
    line3 = infile.readline()
    line4 = infile.readline()
    line5 = infile.readline()
    line6 = infile.readline()
    line7 = infile.readline()
    line8 = infile.readline()
    line9 = infile.readline()
    line10 = infile.readline()
    line11 = infile.readline()
    line12 = infile.readline()

    infile.close()

    print(line1)
    print(line2)
    print(line3)
    print(line4)
    print(line5)
    print(line6)
    print(line7)
    print(line8)
    print(line9)
    print(line10)
    print(line11)
    print(line12)



Main()

Answer 1

这是最简单的方法：

1）使用循环从用户获取所有值并将其存储在数组中。

 for i in range(12):
     #get details here

2）打开文件并写入数组内容。

 f = open("grades.txt", 'wt')
 #write list contents to file

3）打开相同的文件并显示内容。

 f = open("grades.txt", 'rt')
 #display file contents here

Answer 2

Open()
 def Open():
try:
    infile = open("grades.txt", "r")

except: print("Error: can't find file or read data")

当您打开文件进行阅读时，模式需要r。否则它会创建一个清除旧数据的新文件。同时将try块中的input分配给grade。< / p>

Answer 3

您应该在循环中设置诸如数组或列表之类的结构来处理变量。 e.g。

names = ["" for x in range(12)]

for i in range(0,len(names) - 1):
   names[i] = input('Enter Name: ')

等等，在循环中分配每个变量。

在Python上读写

3 个答案: