閱讀和Python的

寫此刻我在做這個小excerscie是由做的：閱讀和Python的

輸入必須是從鍵盤互動。你將爲12名學生提供投入。
您將輸入學生的姓名和平均成績。學生無法輸入平均值在零以下或100以上。如果發生這種情況，您的程序必須提出並處理例外。
將所有輸出寫入名爲grades.txt的文件
關閉輸出文件。
打開文件grades.txt進行輸入。
如果未找到該文件，程序將引發並處理異常。
從文件中讀取所有記錄並顯示它們。

我有這個到目前爲止，但我不能讓它工作。我能做什麼？

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()

來源

2014-11-24 Cimeies Kimaris

如果你不得不重複這麼多的代碼，你應該自己考慮是否可以使用循環。 – icktoofay 2014-11-24 05:23:36

'try'塊中的'Input（）'沒有被賦值給任何變量。 – vks 2014-11-24 05:24:27

輸入設置爲Def Def Input（）？ – 2014-11-24 05:28:18

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

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

當閱讀模式中打開文件需要r。或者否則它會創建一個新的文件cleeaning老data.Also在try塊分配給inputgrade。

來源

2014-11-24 05:29:43 vks

您應該在循環內設置一個結構，如數組或列表來處理變量。例如

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

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

等等，分配循環內的每個變量。

來源

2014-11-24 05:36:23 smashbro

這是你可以做的最簡單：

1）使用循環來從用戶那裏獲取所有的值，並將其存儲在數組中。

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

2）打開文件並寫入數組內容。

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

3）打開相同的文件並顯示內容。

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

來源

2014-11-24 05:53:38 kmario23

閱讀和Python的

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