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我最近尝试在 python 中使用 Asymptote。按照这里的指示:http: //asymptote.sourceforge.net/doc/Interactive-mode.html,在最底部,它说将asymptote.py文件放在 python 路径上。我已经这样做了,但是当我尝试执行一些代码时,它给出了错误(python 安装在C:\Python27,而asymptote.py安装在C:\Python27\Lib\site-packages):

-: 4.1: syntax error
error: could not load module '-'

里面的代码asymptote.py贴在这里:

# Python module to feed Asymptote with commands
# (modified from gnuplot.py)
from subprocess import *
class asy:
    def __init__(self):
        self.session = Popen(['asy', '-quiet', '-interactive'], stdin=PIPE)
        self.help()
    def send(self, cmd):
        self.session.stdin.write(cmd+'\n')
        self.session.stdin.flush()
    def size(self, size):
        self.send("size(%d);" % size)
    def draw(self, str):
        self.send("draw(%s);" % str)
    def fill(self, str):
        self.send("fill(%s);" % str)
    def clip(self, str):
        self.send("clip(%s);" % str)
    def label(self, str):
        self.send("label(%s);" % str)
    def shipout(self, str):
        self.send("shipout(\"%s\");" % str)
    def erase(self):
        self.send("erase();")
    def help(self):
        print "Asymptote session is open.  Available methods are:"
        print "    help(), size(int), draw(str), fill(str), clip(str), label(str), shipout(str), send(str), erase()"
    def __del__(self):
        print "closing Asymptote session..."
        self.send('quit');
        self.session.stdin.close();
        self.session.wait()
if __name__=="__main__":
    g = asy()
    g.size(200)
    g.draw("unitcircle")
    g.send("draw(unitsquare)")
    g.fill("unitsquare, blue")
    g.clip("unitcircle")
    g.label("\"$O$\", (0,0), SW")
    raw_input("press ENTER to continue")
    g.erase()
    del g

我的代码:

from asymptote import *
g=asy()
g.size(200)
g.draw("unitcircle")
g.send("draw(unitsquare)")
g.fill("unitsquare, blue")
g.clip("unitcircle")
g.label("\"$O$\", (0,0), SW")

我知道这asymptote.py只是为了向 提供命令asy.exe,并且我已经Asymptote安装在我的计算机上。如何解决此错误?

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