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[英]TypeError: unsupported operand type(s) for +=: 'NoneType' and 'str'
[英]Python TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'
在提出問題之前,我已經對此進行了調查,但是找不到適合我情況的任何東西。
我正在編寫一個Python程序-一個文本編輯器; 使用Python和Gtk + 3。
這是我得到的錯誤:
Traceback (most recent call last):
File "file.py", line 58, in on_s_pressed
if (self.set_title == (filename + " - DeSedit")):
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'
這是我的代碼:
#!/usr/bin/env python3
from gi.repository import Gtk, Gdk
class DeSedit(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="DeSedit")
self.set_default_size(650, 500)
# keyboard shortcuts
""" <Control>O """
accel = Gtk.AccelGroup()
accel.connect(Gdk.keyval_from_name('O'), Gdk.ModifierType.CONTROL_MASK, 0, self.on_o_pressed)
self.add_accel_group(accel)
""" <Control>S """
accel1 = Gtk.AccelGroup()
accel1.connect(Gdk.keyval_from_name('S'), Gdk.ModifierType.CONTROL_MASK, 0, self.on_s_pressed)
self.add_accel_group(accel1)
# grid to organize widgets
self.box = Gtk.Box()
self.add(self.box)
# text view
self.textview = Gtk.TextView()
self.textview.set_wrap_mode(True)
self.textbuffer = self.textview.get_buffer()
# scroll bar
scrollwindow = Gtk.ScrolledWindow()
scrollwindow.add(self.textview)
self.box.pack_start(scrollwindow, True, True, 0)
# open file dialog
def on_o_pressed(self, *args):
openDialog = Gtk.FileChooserDialog("Select file to be opened", self,
Gtk.FileChooserAction.OPEN,
(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
response = openDialog.run()
if response == Gtk.ResponseType.OK:
filename = openDialog.get_filename()
with open(filename, 'r') as fRead:
data = fRead.read()
self.textbuffer.set_text(data)
self.set_title(filename + " - DeSedit")
fRead.close()
openDialog.destroy()
elif response == Gtk.ResponseType.CANCEL:
openDialog.destroy()
# save file dialog
def on_s_pressed(self, *args):
saveDialog = Gtk.FileChooserDialog("Select folder to save file", self,
Gtk.FileChooserAction.SAVE,
(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
Gtk.STOCK_SAVE, Gtk.ResponseType.OK))
filename = saveDialog.get_filename()
if self.set_title == (filename + " - DeSedit"):
print("hmm")
response = saveDialog.run()
if response == Gtk.ResponseType.OK:
with open(filename, 'w') as fWrite:
data = self.textbuffer.get_text(self.textbuffer.get_start_iter(),
self.textbuffer.get_end_iter(), True)
fWrite.write(data)
fWrite.close()
saveDialog.destroy()
elif response == Gtk.ResponseType.CANCEL:
saveDialog.destroy()
window = DeSedit() # create DeSedit object
window.connect("delete-event", Gtk.main_quit)
window.show_all()
Gtk.main()
它基本上告訴您filename
是一個NoneType對象,這意味着saveDialog.get_filename()
返回None
。
根據文檔,這意味着未選擇文件
gtk.FileChooser.get_filename
def get_filename()
返回:當前選定的文件名;如果未選擇任何文件,則返回None;否則所選文件不能用本地文件名表示。
您的文件名來自這里:
filename = saveDialog.get_filename()
該函數由於某種原因(可能是由於用戶取消了對話框-當您取消Tkinter文件對話框時,您得到一個空字符串)而返回None
,然后嘗試將其與字符串組合,這是無法完成的。 放入一些錯誤處理代碼以處理未選擇文件名的情況,例如if not filename: return
選擇if not filename: return
或其他內容。
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