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====================================================
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Notes on code execution in :class:`InteractiveShell`
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====================================================
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Overview
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========
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This section contains information and notes about the code execution
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system in :class:`InteractiveShell`. This system needs to be refactored
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and we are keeping notes about this process here.
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Current design
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==============
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Here is a script that shows the relationships between the various
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methods in :class:`InteractiveShell` that manage code execution::
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import networkx as nx
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import matplotlib.pyplot as plt
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exec_init_cmd = 'exec_init_cmd'
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interact = 'interact'
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runlines = 'runlines'
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runsource = 'runsource'
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runcode = 'runcode'
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push_line = 'push_line'
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mainloop = 'mainloop'
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embed_mainloop = 'embed_mainloop'
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ri = 'raw_input'
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prefilter = 'prefilter'
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g = nx.DiGraph()
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g.add_node(exec_init_cmd)
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g.add_node(interact)
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g.add_node(runlines)
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g.add_node(runsource)
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g.add_node(push_line)
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g.add_node(mainloop)
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g.add_node(embed_mainloop)
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g.add_node(ri)
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g.add_node(prefilter)
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g.add_edge(exec_init_cmd, push_line)
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g.add_edge(exec_init_cmd, prefilter)
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g.add_edge(mainloop, exec_init_cmd)
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g.add_edge(mainloop, interact)
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g.add_edge(embed_mainloop, interact)
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g.add_edge(interact, ri)
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g.add_edge(interact, push_line)
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g.add_edge(push_line, runsource)
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g.add_edge(runlines, push_line)
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g.add_edge(runlines, prefilter)
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g.add_edge(runsource, runcode)
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g.add_edge(ri, prefilter)
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nx.draw_spectral(g, node_size=100, alpha=0.6, node_color='r',
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font_size=10, node_shape='o')
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plt.show()
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