### Install st-cytoscape Component (Bash)

Source: https://github.com/vivien000/st-cytoscape/blob/master/README.md

Provides the command to install the st-cytoscape Streamlit component using pip. This is the first step to use the library.

```Bash
pip install st-cytoscape
```

--------------------------------

### Use Klay Layout (Python)

Source: https://github.com/vivien000/st-cytoscape/blob/master/README.md

Provides a simple example of how to specify the klay layout option for the graph using the cytoscape-klay extension.

```Python
layout = {"name": "klay"}
```

--------------------------------

### Apply fCoSE Layout Constraints (Python)

Source: https://github.com/vivien000/st-cytoscape/blob/master/README.md

Shows examples of how to define and apply placement constraints (horizontal alignment, relative placement) when using the fcose layout option in st-cytoscape. Requires the fcose layout to be specified.

```Python
layout = {"name": "fcose", "animationDuration": 0}
layout["alignmentConstraint"] = {"horizontal": [["X", "Y"]]}
layout["relativePlacementConstraint"] = [{"top": "Z", "bottom": "X"}]
layout["relativePlacementConstraint"] = [{"left": "X", "right": "Y"}]
```

--------------------------------

### Embed Cytoscape Graph in Streamlit (Python)

Source: https://github.com/vivien000/st-cytoscape/blob/master/README.md

Demonstrates how to use the st_cytoscape.cytoscape function to embed a graph in a Streamlit app. It shows how to define graph elements, stylesheet, and retrieve selected nodes/edges. Requires streamlit and st-cytoscape.

```Python
import streamlit as st
from st_cytoscape import cytoscape

elements = [
    {"data": {"id": "X"}, "selected": True, "selectable": False},
    {"data": {"id": "Y"}},
    {"data": {"id": "Z"}},
    {"data": {"source": "X", "target": "Y", "id": "X➞Y"}},
    {"data": {"source": "Z", "target": "Y", "id": "Z➞Y"}},
    {"data": {"source": "Z", "target": "X", "id": "Z➞X"}},
]

stylesheet = [
    {"selector": "node", "style": {"label": "data(id)", "width": 20, "height": 20}},
    {
        "selector": "edge",
        "style": {
            "width": 3,
            "curve-style": "bezier",
            "target-arrow-shape": "triangle"
        }
    }
]

selected = cytoscape(elements, stylesheet, key="graph")

st.markdown("**Selected nodes**: %s" % (", ".join(selected["nodes"])))
st.markdown("**Selected edges**: %s" % (", ".join(selected["edges"])))
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.