使用 graphviz 将有向图转换为 StringIO

Question

有谁知道如何将 Digraph 转换为 io.StringIO png 的技巧？我能找到的唯一代码是将它保存到磁盘，但我想省去任何磁盘使用，而是在内存中处理它：

from graphviz import Digraph
import io

dot = Digraph(comment='The Round Table')
dot.node('A', 'King Arthur')

# instead of this...
dot.render('test-output/round-table.gv', view=True)

# ... I need something like this:
data = io.StringIO()
dot.export_to_png(dot)

Answer 1

是这样的吗？

from graphviz import Digraph
import io

dot = Digraph(comment='The Round Table', format='gv')
dot.node('A', 'King Arthur')

data = io.StringIO()

print("writing")
data.write( dot.pipe().decode('utf-8') )

print("reading")
data.seek(0)
print(data.read())

# print(data.getvalue())


data.close()