如果你的嵌入式Python代码调用了 tkinter library库（它被很多图形制作库使用，包括matplotlib），你可能会得到这个错误：
<THROW> *%Exception.PythonException <CLASS DOES NOT EXIST> 230 ^^0^DO ##CLASS(User.Test).Test()
<class '_tkinter.TclError'>: Can't find a usable init.tcl in the following directories:
c:/intersystems/irispy/lib/python/lib/tcl8.6
c:/intersystems/irispy/lib/tcl8.6
c:/intersystems/lib/tcl8.6
c:/intersystems/irispy/library
c:/intersystems/library
c:/intersystems/tcl8.6.9/library
c:/tcl8.6.9/library
This probably means that Tcl wasn't installed properly.下面是一个触发这个错误的代码样本：
Class User.Test
{
/// do ##class(User.Test).Test()
ClassMethod Test() [ Language = python ]
{
import matplotlib.pyplot as plt
import numpy as np
# Data for plotting
t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2 * np.pi * t)
fig, ax = plt.subplots()
ax.plot(t, s)
ax.set(xlabel='time (s)', ylabel='voltage (mV)')
ax.grid()
fig.savefig("test.png")
}
}在这种情况下，你不需要安装tcl和tk库。其中一个方法是从源代码开始构建。In that case you need no install tcl and tk libraries. One of the approaches is 从源代码来构建。
对于windows系统，你可以在这里获得预构建的二进制文件。例如，根据我的错误，我需要8.6.12.5版本。下载它并从lib文件夹中复制tcl8.6和tk8.6到 c:/intersystems/irispy/lib/python/lib/ 或你的错误信息中的任何其他路径。
之后，你可能会得到另一个错误：
Can't find a usable init.tcl in the following directories:
c:/intersystems/irispy/lib/python/lib/tcl8.6
c:/intersystems/irispy/lib/tcl8.6
c:/intersystems/lib/tcl8.6
c:/intersystems/irispy/library
c:/intersystems/library
c:/intersystems/tcl8.6.9/library
c:/tcl8.6.9/library
c:/intersystems/irispy/lib/python/lib/tcl8.6/init.tcl: version conflict for package "Tcl": have 8.6.9, need exactly 8.6.12
version conflict for package "Tcl": have 8.6.9, need exactly 8.6.12
while executing "package require -exact Tcl 8.6.12"
(file "c:/intersystems/irispy/lib/python/lib/tcl8.6/init.tcl" line 19)
invoked from within "source c:/intersystems/irispy/lib/python/lib/tcl8.6/init.tcl" ("uplevel" body line 1)
invoked from within "uplevel #0 [list source $tclfile]"
This probably means that Tcl wasn't installed properly.这意味着二进制文件与预期的版本不同，但这是一个微小的差异，可以通过打开 init.tcl 并把
package require -exact Tcl 8.6.12替换成
package require -exact Tcl 8.6.9同样的，在 tk.tcl把
package require -exact Tk 8.6.12替换成
package require -exact Tk 8.6.9之后，tkinter 就应该正常工作了。