Graph nodes and edges in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a graph node with a unique identifier.

LangChain

from langchain.graphs import Node

node = Node(id=[1])

Drag options to blanks, or click blank then click option'

A'node1'

Bnode1

C1

D"node1"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the node ID

Using a variable name without defining it

The id parameter requires a string identifier. Using double quotes "node1" correctly passes a string.

2fill in blank

medium

Complete the code to add an edge connecting two nodes in the graph.

LangChain

from langchain.graphs import Edge

edge = Edge(source=[1], target="node2")

Drag options to blanks, or click blank then click option'

A"node1"

B'node1'

Cnode1

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a variable name instead of a string

Using single quotes inconsistently

The source parameter expects a string ID of the source node. Using double quotes "node1" correctly passes the string.

3fill in blank

hard

Fix the error in creating a graph node with metadata.

LangChain

node = Node(id="node3", metadata=[1])

Drag options to blanks, or click blank then click option'

A'color: blue'

B['color', 'blue']

C{'color': 'blue'}

D"color: blue"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list instead of a dictionary

Passing a string instead of a dictionary

The metadata parameter expects a dictionary. Using {'color': 'blue'} correctly passes a dictionary with key-value pairs.

4fill in blank

hard

Fill both blanks to create a graph with two nodes and an edge connecting them.

LangChain

from langchain.graphs import Graph, Node, Edge

node1 = Node(id=[1])
node2 = Node(id=[2])
graph = Graph(nodes=[node1, node2], edges=[Edge(source="node1", target="node2")])

Drag options to blanks, or click blank then click option'

A"node1"

B"node2"

C'node1'

D'node2'

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing single and double quotes

Using variable names without quotes

Node IDs must be strings. Using double quotes "node1" and "node2" correctly creates the nodes.

5fill in blank

hard

Fill all three blanks to create a graph with nodes having metadata and an edge connecting them.

LangChain

node1 = Node(id=[1], metadata=[2])
node2 = Node(id="node2", metadata={'type': 'end'})
graph = Graph(nodes=[node1, node2], edges=[Edge(source=[3], target="node2")])

Drag options to blanks, or click blank then click option'

A"node1"

B{'type': 'start'}

D'node1'

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of dictionaries for metadata

Not quoting node IDs properly

The first blank is the node ID as a string "node1". The second blank is metadata as a dictionary {'type': 'start'}. The third blank is the source node ID for the edge, also "node1".