Python 如何从 Tkinter 滑块（“比例”）中获取价值？
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How to Get Value Out from the Tkinter Slider ("Scale")?
提问by user2006082
So, here is the code I have, and as I run it, the value of the slider bar appears above the slider, I wonder is there a way to get that value out? Maybe let a=that value. ;)
所以，这是我的代码，当我运行它时，滑块的值出现在滑块上方，我想知道有没有办法把这个值取出来？也许让 a=那个值。;)
from Tkinter import *
control = Tk()
control.geometry("350x200+100+50")
scale = Scale(control,orient=HORIZONTAL,length=300,width=20,sliderlength=10,from_=0,to=1000,tickinterval=100)
scale.pack()
control.mainloop()
回答by Martijn Pieters
Call the .get()method on the slider to read the current value:
调用.get()滑块上的方法读取当前值：
print scale.get()
See the Tkinter Scale widgetdocumentation.
请参阅Tkinter Scale 小部件文档。
回答by mmgp
To get the value as it is modified, associate a function with the parameter command. This function will receive the current value, so you just work with it. Also note that in your code you have cline3 = Scale(...).pack(). cline3is always None in this case, since that is what pack()returns.
要获取修改后的值，请将函数与参数 关联command。此函数将接收当前值，因此您只需使用它即可。另请注意，在您的代码中，您有cline3 = Scale(...).pack(). cline3在这种情况下总是 None ，因为那是pack()返回的内容。
import Tkinter
def print_value(val):
print val
root = Tkinter.Tk()
scale = Tkinter.Scale(orient='horizontal', from_=0, to=128, command=print_value)
scale.pack()
root.mainloop()
回答by mmgp
Idk if you have finally solved or not given age: but ive done a similar app for robot control. Basic code after gui was declared and initialized, and scale programmed: scale(blahblahblah) Scale.grid(blahblah)
不知道你是否最终解决了或没有给出年龄：但我为机器人控制做了一个类似的应用程序。gui声明初始化后的基本代码，以及scale编程： scale(blahblahblah) Scale.grid(blahblah)
Def forward():
motor1.forward(scale.get())
motor2.backward(scale.get())
Bear in mind: speed value requires percentage of 1, so set the scale to: from 0 to 1 with intervals being either .01 or .1(i used .1 for 10ths of my speed variable)
请记住：速度值需要 1 的百分比，因此将比例设置为：从 0 到 1，间隔为 .01 或 .1（我使用 .1 表示速度变量的 10 分之一）
