Python文件错误

Question

File = input("Please enter the name for your txt. file: ")

fileName = (File + ".txt")
WRITE = "w"
APPEND = "a"

file = []
name = " "
while name != "DONE" :
    name = input("Please enter the guest name (Enter DONE if there is no   more names) : ").upper()
   fileName.append(name)
fileName.remove("DONE")
print("The guests list in alphabetical order, and it will save in " + fileName + " :")
file.sort()
for U in file :
    print(U)
file = open(fileName, mode = WRITE)
file.write(name)
file.close()
print("file written successfully.")

我只是练习用Python编写文件，但发生了一些不好的事情。

以下是关于此的一些错误：

fileName.remove("DONE")

仍在展示＆＃39; str＆＃39;错误。

Answer 1

Python字符串是不可变的。因此，您无法在其上使用in。请改用append()：

+=

这是

的简写

fileName += name

注意字符串中没有附加任何内容，而是创建一个新字符串，然后分配给fileName = fileName + name 。

Answer 2

filename=filename+name

使用上面的代码

Answer 3

试试这个。 我以为你在变量名中有些错误。

        Vector<Vector<Integer>> uSupVec = new Vector<Vector<Integer>>();
        Vector<Integer> uSup = new Vector<Integer>();
        Boolean isRep = false;
        for (int i = 1; i <numSup ; i++) {
            uSup.clear();
            for (int l = 0; l < i; l++) {
                if (supName[i] == supName[l]) {
                    isRep = true;
                }}
            if (!isRep){uSup.add(i);}       
            for (int j = i+1; j < numSup; j++) {
                if (supName[i] == supName[j]) {
                        if (!isRep){uSup.add(j);}
                        }}
            isRep = false;
            uSupVec.add((Vector) uSup);
        }

Answer 4

刚刚蝙蝠，你不能附加到一个人身上。

fileName.append(name) #how can you append or remove anything into or from this when it contains toople?

另一件事，我不知道你正在使用什么版本的python，但我从未见过像这样的表达

file = open(fileName, mode = WRITE) #this should be something like (file=open(fileName,"w"))

只需全面检查您的代码。就像我说你不能添加或删除东西的东西;只在列表和词典中。

Answer 5

append是list's method，其中代码中声明的fileName被视为字符串。如果您打算将字符串附加到文件，请以“追加”模式打开文件并写入：

with open(aFile + ".txt", "a") as f:
    f.write("appended text")