Python:带有无限循环的控制台，超出堆栈空间

Question

实现粘贴在下面。然而，每次我在控制台中实际输入一些东西时，我得到这个错误:

        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?)

这是由另一个应用程序(Matplotlib GUI)使用的，它实例化ConsoleInput，然后为自己使用最近的用户条目。

为什么会发生这个错误，我如何修复ConsoleInput?是否有一种方法来检查是否有挂起的输入，并只读取它们，而不是不断循环?

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()

下面是使用控制台输入的GUI的相关部分:

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:

Answer 1

[edit]根据您提供的新信息…试试这个解决方案(原始解决方案见下文)

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()

两件事像这样的东西可能是你正在寻找的…但一般来说，你真的不应该用GUI程序阅读stdin…

一个更好的解决方案是从gui中获取信息，比如

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()

然而，如果你真的想使用控制台输入，你可能应该使用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()

这也演示了一个简短的可运行代码示例