Handling rate limits and errors in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the exception class for rate limit errors in LangChain.

LangChain

from langchain.exceptions import [1]

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

AConnectionError

BTimeoutError

CValueError

DRateLimitError

Attempts:

3 left

💡 Hint

Common Mistakes

Importing a generic error like ValueError instead of RateLimitError.

The RateLimitError class is used to catch rate limit exceptions in LangChain.

2fill in blank

medium

Complete the code to catch a rate limit error using a try-except block.

LangChain

try:
    response = llm.invoke(prompt)
except [1]:
    print("Rate limit reached, please wait.")

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

ARateLimitError

BKeyError

CTimeoutError

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Catching the wrong exception type like TimeoutError.

We catch RateLimitError to handle rate limit exceptions gracefully.

3fill in blank

hard

Fix the error in the code to retry after a delay when a rate limit error occurs.

LangChain

import time

try:
    result = llm.invoke(prompt)
except [1]:
    print("Rate limit hit, retrying in 5 seconds...")
    time.sleep(5)
    result = llm.invoke(prompt)

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

ATimeoutError

BRuntimeError

CRateLimitError

DConnectionError

Attempts:

3 left

💡 Hint

Common Mistakes

Catching a different error that won't trigger on rate limits.

Retrying after catching RateLimitError helps handle temporary rate limits.

4fill in blank

hard

Fill both blanks to handle rate limit errors and log the error message.

LangChain

try:
    output = llm.invoke(prompt)
except [1] as e:
    print(f"Error: [2]")

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

ARateLimitError

BTimeoutError

Ce

Dstr(e)

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong error class or printing the error object directly without conversion.

Catch RateLimitError as e and print its string message using str(e).

5fill in blank

hard

Fill all three blanks to implement a retry loop that handles rate limits with exponential backoff.

LangChain

import time
max_retries = 3
for attempt in range([1]):
    try:
        response = llm.invoke(prompt)
        break
    except [2]:
        wait = 2 ** attempt
        print(f"Rate limit hit, retrying in [3] seconds...")
        time.sleep(wait)

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

Amax_retries

BRateLimitError

Cwait

DTimeoutError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong exception or hardcoding retry count instead of variable.

Use max_retries for loop count, catch RateLimitError, and wait wait seconds before retrying.