LangChain Expression Language (LCEL) basics - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a simple LCEL chain that chains a prompt with an LLM.

LangChain

chain = [1] | llm

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

A"prompt"

Bx

Cadd

Dprompt

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name like 'x' instead of 'prompt'.

Putting quotes around the variable name.

LCEL uses the pipe operator | to chain runnables. Assuming prompt and llm are defined, the chain is prompt | llm.

2fill in blank

medium

Complete the code to create an LCEL chain that includes an output parser.

LangChain

chain = prompt | llm | [1]

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

A"parser"

Bmultiply

Cparser

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number instead of a variable.

Putting quotes around the variable name.

A common LCEL chain is prompt | llm | parser, where parser is typically StrOutputParser().

3fill in blank

hard

Fix the code in the LCEL chain to correctly chain the prompt and llm using the pipe operator.

LangChain

chain = prompt [1] llm

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

A<=

B|

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using mathematical comparison operators.

Using equality operator instead of the pipe.

LCEL chains runnables using the pipe operator |.

4fill in blank

hard

Fill both blanks to create an LCEL chain with prompt, llm, and parser using pipe operators.

LangChain

chain = [1] | llm [2] parser

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

Aprompt

B|

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using equality or other operators instead of pipe.

Wrong variable name.

The full chain is prompt | llm | parser, using | operators and the prompt variable.

5fill in blank

hard

Fill all three blanks to create an LCEL chain: prompt piped to llm, piped to parser, with correct operators and names.

LangChain

[1] [2] llm [3] parser

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

Aprompt

B|

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong operators like == or !=.

Incorrect variable names.

The chain is prompt | llm | parser.