Access INP file without running a simulation

[JoaoBarreiro]

Hello,
I am implementing an analysis after running the simulation, for which I need some of data INP data. I was implementing something like the code below. Correct me if I'm wrong, but by doing this I am starting the simulation but not going through its timesteps. How can I access the INP File data without starting/running the simulation?

def getElementsProperties(InpFilePath):

with Simulation(InpFilePath) as sim:
    NodesDict = {}
    for node in Nodes(sim):
        new_node = {}
        if node.is_junction:
            new_node["InvertElevation"] = node.invert_elevation
            new_node["FullDepth"] = node.full_depth    
        NodesDict[node.nodeid] = new_node
            
    LinksDict = {}
    for link in Links(sim):
        if link.is_conduit:
            new_link = {}
            new_link["Nodes"] = link.connections   # tuple (“UpstreamNodeID”,”DownstreamNodeID”)
            new_link["InletOffset"] = link.inlet_offset
            new_link["OutletOffset"] = link.outlet_offset
        LinksDict[link.linkid] = new_link

return NodesDict, LinksDict

[bemcdonnell]

@JoaoBarreiro, I think you should use swmmio for accessing info. You are correct, pyswmm.Simulation “opens” a simulation (which will overwrite your RPT/OUT). I’m guessing that is the problem you’re experiencing. Swmmio and pyswmm are friends at the moment and will soon be coupled together more tightly. I’m going to transfer this discussion to swmmio

[JoaoBarreiro]

@bemcdonnell thanks for the reply. That's what I thought. I wasn't aware of the existence of swmmio, and I will explore this.
Thanks

[bemcdonnell]

@aerispaha care to provide a simple example? :-)

[aerispaha]

Hi @JoaoBarreiro, as @bemcdonnell suggested, you can used swmmio to fetch data from the INP file without needing to run the simulation. Here is a basic example:

import swmmio

# instantiate a swmmio Model object with your inp file
model = swmmio.Model('path/to/model.inp') 

# access an aggregation of inp data related to model nodes, using the higher level api
nodes = model.nodes.dataframe 

# similarly, access an aggregation of data related to model links
links = model.links.dataframe 

Here, nodes will be Pandas DataFrames with columns for InvertElev, SurchargeDepth, and many others. Similarly, links will be a DataFrame containing InletNode, OutletNode, Geom1 etc.

Finally, if you need data from the INP that isn't provided in the higher level API via model.nodes and model.links, you can access individual sections in the INP file using the lower-level model.inp API. For example, we can fetch the [DWF] section of an INP file (if it exists) as a dataframe like this:

model.inp.dwf 

More documentation on this can be found over here.

Does that answer your question?