Interactive demo | chem/12-psychrometrics

def endpoint(v1:float=43, prop1:props=props[0], v2:float=23, prop2:props=props[1], prop3:props=props[5]) -> PIL.Image.Image:
    """Looks up psychrometrics parameters. This has nothing to do with
psychology, even to my surprise. It's about thermo properties of water
in both liquid and vapor phases. You can specify 3 properties and 2
values, and this will calculate the other property.

All possible configs:

<table>
    <tr><th>Property</th>  <th>Description</th>          <th>Units</th></tr>
    <tr><td>relHum</td>    <td>Relative humidity</td>    <td>%</td></tr>
    <tr><td>humid</td>     <td>Absolute humidity</td>    <td>kg water/kg dry air</td></tr>
    <tr><td>wetBulb</td>   <td>Wet bulb temperature</td> <td>Celcius</td></tr>
    <tr><td>dryBulb</td>   <td>Dry bulb temperature</td> <td>Celcius</td></tr>
    <tr><td>enthalpy</td>  <td>Enthalpy</td>             <td>J/g dry air</td></tr>
    <tr><td>specificV</td> <td>Specific volume</td>      <td>m³/kg</td></tr>
<table>

:param v1: first value
:param prop1: first property
:param v2: second value
:param prop2: second property
:param prop3: third property"""
    g = globals()
    res = solveFwdFull(v1, v2, g[prop1], g[prop2])
    [prop1, prop2, prop3] | apply(lambda prop: globals()[prop]["ps"] | repeat(3) | joinStreams()) | transpose() | apply(~aS(plt.plot, color="tab:blue") + ~aS(plt.plot, color="tab:orange") + ~aS(plt.plot, color="tab:green")) | deref()
    if res is not None:
        x, y = res; v3 = solveBkwd(x, y, g[prop3])
        plt.plot([x], [y], "o", color="tab:red")
    else: return ["Can't solve"] | toImg()
    plt.legend([prop1, prop2, prop3]); plt.grid(True)
    g[prop3]["ps"] | item().all(2) | insertColumn(g[prop3]["vs"], begin=False) | apply(round, 2, ndigits=4) | ~apply(plt.text, color="tab:red", weight="bold", fontsize=12) | ignore()
    plt.title(f"{v1:.3f} {units[prop1]}, {v2:.3f} {units[prop2]}, {v3:.3f} {units[prop3]}")
    return plt.gcf() | toImg()