正如在此答案中提到的，可能的解决方法是打开一个子进程以使用ghostscript：
canvas.postscript(file="tmp.ps", colormode='color')
process = subprocess.Popen(["ps2pdf", "tmp.ps", "result.pdf"], shell=True)
另一个解决方案是使用ReportLab，但是由于它addPostScriptCommand不是很可靠，我认为您必须使用Python Imaging Library将PS文件首先转换为图像，然后再将其添加到ReportLabCanvas中。但是，我建议使用ghostscript方法。
这是我用来查看是否有效的基本概念证明：
"""
Setup for Ghostscript 9.07:
Download it from http://www.ghostscript.com/GPL_Ghostscript_9.07.html
and add `/path/to/gs9.07/bin/` and `/path/to/gs9.07/lib/` to your path.
"""
import Tkinter as tk
import subprocess
import os
class App(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self.title("Canvas2PDF")
self.line_start = None
self.canvas = tk.Canvas(self, width=300, height=300, bg="white")
self.canvas.bind("<Button-1>", lambda e: self.draw(e.x, e.y))
self.button = tk.Button(self, text="Generate PDF",
command=self.generate_pdf)
self.canvas.pack()
self.button.pack(pady=10)
def draw(self, x, y):
if self.line_start:
x_origin, y_origin = self.line_start
self.canvas.create_line(x_origin, y_origin, x, y)
self.line_start = None
else:
self.line_start = (x, y)
def generate_pdf(self):
self.canvas.postscript(file="tmp.ps", colormode='color')
process = subprocess.Popen(["ps2pdf", "tmp.ps", "result.pdf"], shell=True)
process.wait()
os.remove("tmp.ps")
self.destroy()
app = App()
app.mainloop()
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