Python - 无效模式('w')或文件名

Question

我遇到了一个很奇怪的错误。

在我的Python脚本中，有一段代码是很多函数的一部分：

url=['http://API_URL/query/query.aspx?name=', name, '&md=user']
url=''.join(url)
file = open("QueryESO.xml", "w")
filehandle = urllib.urlopen(url)
for lines in filehandle.readlines():
    file.write(lines)
file.close()

当我在IDLE里运行时，一切都很好。

但是如果我在命令行用Python运行，就会出现这个错误：

[Errno 22] invalid mode('w') or filename: 'QueryESO.xml'

事情开始变得奇怪了：

奇怪 #1：我在脚本的不同函数里有完全相同的代码，但这个错误只在其中一个函数里出现。

奇怪 #2：如果我把代码改成这样，它就能正常工作：

url=['http://API_URL/query/query.aspx?name=', name, '&md=user']
print url
url=''.join(url)
file = open("QueryESO.xml", "w")
filehandle = urllib.urlopen(url)
for lines in filehandle.readlines():
    file.write(lines)
file.close()

我还尝试把打印网址的代码移到我把列表合并之后，这也不行。我还试过打印一个空字符串，这也出现了之前提到的错误。

所以我想我找到了一个解决办法……但有人能解释一下这种情况吗？我是不是做错了什么？（你需要我把整个脚本发出来让你看看吗？）

编辑：这是整个代码：

import urllib
from Tkinter import *
import tkFont
master = Tk()

QUERY_ESO = "QueryESO.xml"

def QueryXML(xml, attribute):
    x = ["<", attribute, ">"]
    x=''.join(x)
    z = xml.split(x, 1)
    x = ["</", attribute, ">"]
    x=''.join(x)
    z=z[1]
    z=z.split(x, 1)
    return z[0]

def AddFriend():
    nfentry = nfe2
    name=nfentry.get()
    url=['http://agecommunity.com/query/query.aspx?name=', name, '&md=user']
    url=''.join(url)
    file = open("QueryESO.xml", "w")
    filehandle = urllib.urlopen(url)
    for lines in filehandle.readlines():
        file.write(lines)
    file.close()
    f = open(QUERY_ESO, "r")
    xml = f.readlines()
    f.close()
    xml=''.join(xml)
    f = open("Friends.txt", "r")
    filestring = f.read()
    f.close()
    fs = filestring.split('\n')
    if name in fs:
        print "Friend Already Added"
    elif xml == "<?xml version='1.0' encoding='utf-8'?><error>Failed to find user</error>":
        print "User does not exist"
    else:
        fs.append(name)
        fs = '\n'.join(fs)
        f = open("Friends.txt", "w")
        f.write(fs)
        f.close()
    nfe2.set("")
    nfentry = nfe2

def DeleteFriend():
    ofentry = ofe2
    name=ofentry.get()
    f = open("Friends.txt", "r")
    filestring = f.read()
    f.close()
    fs = filestring.split('\n')
    if name in fs:
        fs.remove(name)
        fs = '\n'.join(fs)
        f = open("Friends.txt", "w")
        f.write(fs)
    ofe2.set("")
    ofentry = ofe2
    
def IsOnline(name):
    url=['http://API_URL/query/query.aspx?name=', name, '&md=user']
    print url
    url=''.join(url)
    file = open("QueryESO.xml", "w")
    filehandle = urllib.urlopen(url)
    for lines in filehandle.readlines():
        file.write(lines)
    file.close()
    f = open(QUERY_ESO, "r")
    xml = f.readlines()
    f.close()
    xml=''.join(xml)
    if xml == "<?xml version='1.0' encoding='utf-8'?><error>Failed to find user</error>":
        print "User does not exist"
    else: 
        datetime = QueryXML(xml, "LastUpdated")
        datetime = datetime.split('T', 1)
        time = datetime[1].split('Z', 1)
        date = datetime[0]
        print "User", name, "is", QueryXML(xml, "presence"), "as of", date, "at", time[0]
        return QueryXML(xml, "presence")

def FriendCheck():
    f = open("Friends.txt", "r")
    filestring = f.read()
    f.close()
    fs = filestring.split('\n')
    Laonline = Label(lowerframe, text="")
    Laonline.grid(column=0, row=0)
    Laonline.grid_forget()
    x=0
    while x <= (len(fs)-1):
        if IsOnline(fs[x]) == "online":
            Laonline = Label(lowerframe, text=fs[x])
            Laonline.grid(column=0, row=x)
        x=x+1

def RunTwo(Function1, Function2):
    Function1()
    Function2()

def DeleteAllFriends():
    fs = "<?xml version='1.0' encoding='utf-8'?>\n<friends>\n</friends>"
    f = open("Friends.txt", "w")
    f.write(fs)
    f.close()
    FriendCheck()

def DAFPop():
    DAFpopup = Toplevel()
    DAFframe = Frame(DAFpopup)
    DAFframe.grid(columnspan=4, column=0, row=0)
    F1 = DeleteAllFriends
    F2 = DAFpopup.destroy
    Q1 = lambda: RunTwo(F1, F2)
    DAFL1 = Label(DAFframe, text="This delete all of your friends. Are you sure you wish to continue?")
    DAFL1.grid()
    DAFOK = Button(DAFpopup, width=10, text="Yes", command=Q1)
    DAFOK.grid(column=1, row=1)
    DAFNO = Button(DAFpopup, width=10, text="No", command=DAFpopup.destroy)
    DAFNO.grid(column=2, row=1)

frame = Frame(master, bd=5)
frame.grid()

friendlist = Frame(frame, bd=5, width=150, height=400)
friendlist.grid(column=0, row=0, rowspan=15)

lon = Frame(friendlist, bd=2, width=150, height=10)
lon.grid()

Lonline = Label(lon, text="Friends Online")
Lonline.grid(column=0, row=1)
underlined = tkFont.Font(Lonline, Lonline.cget("font"))
underlined.configure(underline=True)
Lonline.configure(font=underlined)

lowerframe = Frame(friendlist, bd=2, width=150, height=390)
lowerframe.grid()

lowerframe.grid_propagate(0)

newfriendframe = Frame(frame, bd=2)
newfriendframe.grid(column=1, row=0)

nfe2 = StringVar()
nfentry = Entry(newfriendframe, width=12, textvariable=nfe2)
nfentry.grid()
nfe2.set("")
nfentry = nfe2.get()

newfriend = Button(newfriendframe, text="Add Friend", width=10, command=AddFriend)
newfriend.grid(column=0, row=1)

oldfriendframe = Frame(frame, bd=2)
oldfriendframe.grid(column=1, row=1)

ofe2 = StringVar()
ofentry = Entry(oldfriendframe, width=12,textvariable=ofe2)
ofentry.grid()
ofe2.set("")
ofentry = ofe2.get()

oldfriend = Button(oldfriendframe, text="Delete Friend", width=10, command=DeleteFriend)
oldfriend.grid(column=0, row=1)

rof = Button(frame, text="Reset List", width=10, command=DAFPop)
rof.grid(column=1, row=2)

update = Button(frame, text="Refresh", width=10, command=FriendCheck)
update.grid(column=1, row=3)

close = Button(frame, text="Exit", width=10, command=master.destroy)
close.grid(column=1, row=4)

master.mainloop()

而且出问题的函数是IsOnline()，虽然我在我发的代码里保留了打印网址的部分，这样它在90%的情况下能正常运行，而没有它时100%都会出错。

它还依赖一个文本文件，叫Friends.txt：

friend1
friend2
friend3

即使QueryESO.xml文件不存在，它似乎也能正常创建这个文件（当然是当没有错误的时候）。如果你那边不行，创建一个空的QueryESO.xml文件也可以，因为它的内容是从网页获取的。

出错的地方在“刷新”按钮的代码里。

错误处理文件路径函数调用文件操作命令行 xml文件代码调试 IDLE环境

Python - 无效模式('w')或文件名

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