擅长:python、mysql、java
<p>我还没有足够的声誉点来评论,所以我现在就回答。在</p>
<p>根据辛普森医生的说法。Sympy.printing.mathml的<code>mathml</code>函数需要表达式。但用字符串格式?在</p>
<p>{a1}</p>
<p>代码部分:</p>
<pre><code>def mathml(expr, **settings):
"""Returns the MathML representation of expr"""
return MathMLPrinter(settings).doprint(expr)
</code></pre>
<p>-</p>
^{pr2}$
<p>你犯了什么错误?在</p>
<p>你有这个吗:</p>
<pre><code>[....]
return MathMLPrinter(settings).doprint(expr) File "C:\Python27\lib\site-packages\sympy\printing\mathml.py", line 39, in doprint
unistr = mathML.toxml() AttributeError: 'str' object has no attribute 'toxml'
</code></pre>
<p>我想是图书馆出了问题。在</p>
<pre><code>unistr = mathML.toxml()
</code></pre>
<p>你可以看看这里<a href="http://docs.sympy.org/dev/_modules/sympy/printing/mathml.html" rel="nofollow">http://docs.sympy.org/dev/_modules/sympy/printing/mathml.html</a>
查看文件。在</p>