Question

name = input("please enter your name\n")
score1=input("please enter your first test score out of 10\n")
score2=input("please enter your second test score out of 10\n")
score3=input("please enter your third test score out of 10\n")
class_=input("please enter the name of your class either class1,class2 or     class3\n")
if class_== ("class1"):
myfile=open("class1.txt","a")
myfile.write(name)
myfile.write("-")
myfile.write(score1)
myfile.write("-")
myfile.write(score2)
myfile.write("-")
myfile.write(score3)
myfile.write("-")
myfile.write(class_)
myfile.write("\n")
myfile.close()
elif class_== ("class2"):
myfile=open("class2.txt","a")
myfile.write(name)
myfile.write("-")
myfile.write(score1)
myfile.write("-")
myfile.write(score2)
myfile.write("-")
myfile.write(score3)
myfile.write("-")
myfile.write(class_)
myfile.write("\n")
myfile.close()
elif class_== ("class3"):
myfile=open("class3.txt","a")
myfile.write(name)
myfile.write("-")
myfile.write(score1)
myfile.write("-")
myfile.write(score2)
myfile.write("-")
myfile.write(score3)
myfile.write("-")
myfile.write(class_)
myfile.write("\n")
myfile.close()
else:
print("please eter a valid class name")
sorting = input("please enter the name of the class you wish to see\n")
if sorting ==("class1"):
myfile=open("class1.txt","r")
for line in myfile:
    class_name = myfile.readline()
    class_name.sort()
    print (class_name)
    myfile.close()

当我在python中运行代码时，它一直工作，直到我问我要选哪个类，当我选择第1类时，总是会出现第51行， class_name.sort（反向=真） AttributeError：＆＃39; str＆＃39;对象没有属性＆＃39; sort＆＃39; 我不知道如何解决这个问题。

Answer 1

您不能在字符串上使用sort()（需要list），请使用：

>>> class_name = 'myclassname'
>>> class_name = ''.join(sorted(class_name))
>>> class_name
'aacelmmnssy'

如果您希望对所有行进行排序：

lines = sorted(myfile.readlines())

Answer 2

这样的事情：

with open(myfile, 'r') as r:
    for line in sorted(r):
        print(line, end='')

如何按字母顺序对文本文件进行排序

2 个答案: