我正在尝试将stdout重定向到Label小部件。目标是在Label中“打印”我脚本中的所有Python打印。
但是，当我点击BUTTON1时，没有任何事情发生......
这是我的代码：
from Tkinter import *
import sys
import tkMessageBox
class App:
def __init__(self, master):
self.frame = Frame(master, borderwidth=5, relief=RIDGE)
self.frame.grid()
class IORedirector(object):
def __init__(self,TEXT_INFO):
self.TEXT_INFO = TEXT_INFO
class StdoutRedirector(IORedirector):
def write(self,str):
self.TEXT_INFO.config(text=str)
self.TEXT_HEADER = self.text_intro = Label(self.frame, bg="lightblue",text="MY SUPER PROGRAMM") ## HEADER TEXT
self.TEXT_HEADER.grid(row=0, column=0, columnspan=2, sticky=W+E+N+S)
self.MENU = Frame(self.frame, borderwidth=5, relief=RIDGE, height=12)
self.MENU.grid(row=1, column=0, sticky=N)
self.button = Button(self.MENU, text="QUIT", fg="red", bg="red", command=self.frame.quit)
self.button.grid(row=4, column=0)
self.BUTTON1 = Button(self.MENU, text="BUTTON1", command=self.BUTTON1_CMD)
self.BUTTON1.grid(row=0, column=0,sticky=W+E)
self.TEXT_INFO = Label(self.frame, height=12, width=40, text="I WANT TO SEE THE STDOUT OUTPUT HERE", bg="grey",borderwidth=5, relief=RIDGE)
self.TEXT_INFO.grid(row=1, column=1)
sys.stdout = StdoutRedirector(self.TEXT_INFO)
def BUTTON1_CMD(self):
print "TEST NUMBER ONE"
print "TEST NUMBER TWO"
root = Tk()
app = App(root)
root.mainloop()
答案 0 :(得分：4)
您没有看到文本集的原因是它被正确设置了一瞬间，然后立即设置为空白。这是因为print在print语句之后向stdout发送换行符。这是一个修改后的版本，它附加到Label而不是为每个print语句覆盖它。
class StdoutRedirector(IORedirector):
def write(self,str):
self.TEXT_INFO.config(text=self.TEXT_INFO.cget('text') + str)
答案 1 :(得分：3)
我创建了一个类，它将stdout写调用复制到tkinter小部件，无论是Label还是Text。适用于Python3.3.1 / WindowsXp。：
import sys
class StdoutToWidget:
'''
Retrieves sys.stdout and show write calls also in a tkinter
widget. It accepts widgets which have a "text" config and defines
their width and height in characters. It also accepts Text widgets.
Use stop() to stop retrieving.
You can manage output height by using the keyword argument. By default
the class tries to get widget\'s height configuration and use that. If
that fails it sets self.height to None which you can also do manually.
In this case the output will not be trimmed. However if you do not
manage your widget, it can grow vertically hard by getting more and
more inputs.
'''
# Inspired by Jesse Harris and Stathis
# http://stackoverflow.com/a/10846997/2334951
# http://stackoverflow.com/q/14710529/2334951
# TODO: horizontal wrapping
# make it a widget decorator (if possible)
# height management for Text widget mode
def __init__(self, widget, height='default', width='default'):
self._content = []
self.defstdout = sys.stdout
self.widget = widget
if height == 'default':
try:
self.height = widget.cget('height')
except:
self.height = None
else:
self.height = height
if width == 'default':
try:
self.width = widget.cget('width')
except:
self.width = None
else:
self.width = width
def flush(self):
'''
Frame sys.stdout's flush method.
'''
self.defstdout.flush()
def write(self, string, end=None):
'''
Frame sys.stdout's write method. This method puts the input
strings to the widget.
'''
if string is not None:
self.defstdout.write(string)
try:
last_line_last_char = self._content[-1][-1]
except IndexError:
last_line_last_char = '\n'
else:
if last_line_last_char == '\n':
self._content[-1] = self._content[-1][:-1]
if last_line_last_char != '\n' and string.startswith('\r'):
self._content[-1] = string[1:]
elif last_line_last_char != '\n':
self._content[-1] += string
elif last_line_last_char == '\n' and string.startswith('\r'):
self._content.append(string[1:])
else:
self._content.append(string)
if hasattr(self.widget, 'insert') and hasattr(self.widget, 'see'):
self._write_to_textwidget()
else:
self._write_to_regularwidget(end)
def _write_to_regularwidget(self, end):
if self.height is None:
self.widget.config(text='\n'.join(self.content))
else:
if not end:
content = '\n'.join(self.content[-self.height:])
else:
content = '\n'.join(self.content[-self.height+end:end])
self.widget.config(text=content)
def _write_to_textwidget(self):
self.widget.insert('end', '\n'.join(self.content))
self.widget.see('end')
def start(self):
'''
Starts retrieving.
'''
sys.stdout = self
def stop(self):
'''
Stops retrieving.
'''
sys.stdout = self.defstdout
@property
def content(self):
c = []
for li in self._content:
c.extend(li.split('\n'))
if not self.width:
return c
else:
result = []
for li in c:
while len(li) > self.width:
result.append(li[:self.width])
li = li[self.width:]
result.append(li)
return result
@content.setter
def content(self, string):
self._content = string.split('\n')
@property
def errors(self):
return self.defstdout.errors
@property
def encoding(self):
return self.defstdout.encoding
EDIT1：我收到了一个downvote，所以这里是更新的。我在Label小部件中使用它，print（）函数在我的小部件中平滑显示。此外，作为一个额外的功能，如果我将None传递给写入调用并且让-1说作结束参数，那么它将不显示最后一行（小心索引）。我使用这个是因为我将滑块附加到小部件。我很快就会发布一个演示。