Protect against accessing an empty stack.
diff --git a/Tools/idle/StackViewer.py b/Tools/idle/StackViewer.py
index d4b8baa..16823a6 100644
--- a/Tools/idle/StackViewer.py
+++ b/Tools/idle/StackViewer.py
@@ -100,6 +100,7 @@
ScrolledList.__init__(self, master)
self.flist = flist
self.browser = browser
+ self.stack = []
def load_stack(self, stack, index=None):
self.stack = stack
@@ -132,6 +133,10 @@
if index is not None:
self.select(index)
+ def popup_event(self, event):
+ if self.stack:
+ return ScrolledList.popup_event(self, event)
+
def fill_menu(self):
menu = self.menu
menu.add_command(label="Go to source line",
@@ -140,7 +145,8 @@
command=self.show_stack_frame)
def on_select(self, index):
- self.browser.show_frame(self.stack[index])
+ if 0 <= index < len(self.stack):
+ self.browser.show_frame(self.stack[index])
def on_double(self, index):
self.show_source(index)
@@ -151,9 +157,12 @@
def show_stack_frame(self):
index = self.listbox.index("active")
- self.browser.show_frame(self.stack[index])
+ if 0 <= index < len(self.stack):
+ self.browser.show_frame(self.stack[index])
def show_source(self, index):
+ if not (0 <= index < len(self.stack)):
+ return
frame, lineno = self.stack[index]
code = frame.f_code
filename = code.co_filename