Python:控制台无限循环,栈空间溢出
下面是实现的代码。不过,每次我在控制台输入内容时,都会出现这个错误:
while executing
"::tcl::Bgerror {out of stack space (infinite loop?)} {-code 1 -level 0 -errorcode NONE -errorinfo {out of stack space (infinite loop?)
while execu..."
error in background error handler:
out of stack space (infinite loop?)
这个错误是因为另一个应用程序(Matplotlib GUI)正在使用它,它会创建一个ConsoleInput,然后使用最近的用户输入。
为什么会出现这个错误,我该如何修复ConsoleInput?有没有办法检查是否有待处理的输入,而不是一直循环读取?
import threading
class ConsoleInput(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = True
self.exit = False
self.most_recent_entry = None
def run(self):
while not self.exit:
self.most_recent_entry = raw_input()
这里是使用控制台输入的GUI相关部分:
def __init__(self):
self.console_input = ConsoleInput()
self.console_input.start()
self.run()
def run(self):
self.figure = plt.figure(figsize=(16, 8))
self.figure.canvas.set_window_title(self.title)
self.gen_data()
plt.connect('button_press_event', self.on_fig_update_event)
plt.connect('motion_notify_event', self.on_fig_update_event)
plt.tight_layout()
plt.show()
def gen_data(self):
if self.console_input.most_recent_entry:
print self.console_input.most_recent_entry:
1 个回答
2
[编辑] 根据你提供的新信息……试试这个解决方案 (原始解决方案在下面找到)
class SomeClass:
def __init__(self):
#this stuff is bad dont do it
#self.console_input = ConsoleInput()
#self.console_input.start()
self.run()
def on_console(self,evt):
print "data = ",self.var.get()
def run(self):
self.figure = plt.figure(figsize=(16, 8))
self.figure.canvas.set_window_title("a title")
plt.subplots_adjust(bottom=0.25) # Make space for stuff
plt.plot([1,2,3],[5,5,6])
#add stuff to our frame
self.var = StringVar() #hold user variable
b = Button(self.figure.canvas.get_tk_widget(),text="Update Chart!")
b.pack(side="bottom",fill="both",padx=4,pady=1)
slider = Entry(self.figure.canvas.get_tk_widget(),textvariable = self.var)
slider.pack(side="bottom", fill='both', padx=4, pady=4)
b.bind("<Button-1>",self.on_console)
plt.show()
有两件事情可能是你在寻找的……但一般来说,图形界面的程序不应该读取标准输入……
一个更好的解决方案是通过图形界面获取信息,像这样:
from matplotlib import pyplot as plt
import tkSimpleDialog
class SomeClass:
def __init__(self):
#this stuff is bad dont do it
#self.console_input = ConsoleInput()
#self.console_input.start()
self.run()
def on_console(self,evt):
data = tkSimpleDialog.askstring("HELLO?","You?")
print data
#do something with the data (and self.figure perhaps)
def run(self):
self.figure = plt.figure(figsize=(16, 8))
self.figure.canvas.set_window_title("a title")
plt.connect('key_release_event', self.on_console)
plt.show()
不过,如果你真的想使用控制台输入,可能应该使用cmd模块。
import cmd
from matplotlib import pyplot as plt
class SomeClass:
def __init__(self):
#this stuff is bad dont do it
#self.console_input = ConsoleInput()
#self.console_input.start()
self.run()
def on_console(self,evt):
print "EVT:",evt
MyCmdInterface(self).cmdloop()
def run(self):
self.figure = plt.figure(figsize=(16, 8))
self.figure.canvas.set_window_title("a title")
plt.connect('key_release_event', self.on_console)
plt.show()
class MyCmdInterface(cmd.Cmd):
"""Simple command processor example."""
prompt="CMD:"
def __init__(self,guiInst):
print "MPL Interactive Command Interface! type HELP for help."
cmd.Cmd.__init__(self)
self.gui = guiInst
def do_HELP(self,line):
print "Some Help Message"
def do_SET(self, line):
assert "=" in line,"SET COMMANDS REQUIRE <varName>=<valName>"
var,val = line.split("=",1)
#do something
def do_NEWDATA(self,line):
newdata = map(float,line.split(","))
print "SET latest_values = %s"%newdata
self.gui.latest_values = newdata
#do something with new data
def do_EOF(self, line):
return True
#aliases for exit
do_EXIT = do_exit = do_QUIT = do_quit = do_DONE = do_done = do_EOF
if __name__ == '__main__':
s = SomeClass()
s.run()
这也展示了一个简短可运行的代码示例是什么样的。