State schema definition in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a state schema with LangChain's BaseMemory.

LangChain

from langchain.memory import BaseMemory

class MyMemory(BaseMemory):
    def __init__(self):
        self.state = [1]

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

A''

B[]

C{}

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list or None instead of a dictionary for state.

The state should be initialized as an empty dictionary {} to store key-value pairs.

2fill in blank

medium

Complete the method to get a value from the state dictionary safely.

LangChain

def get_value(self, key):
    return self.state.[1](key, None)

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

Afetch

Bpop

Cfind

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop which removes the key from the dictionary.

The get method returns the value for the given key or None if the key is missing.

3fill in blank

hard

Fix the error in the method that updates the state with a new key-value pair.

LangChain

def update_state(self, key, value):
    self.state[1] = value

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

A[key]

B(key)

C{key}

D.key

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or curly braces which cause syntax errors.

To update a dictionary entry, use square brackets with the key: self.state[key] = value.

4fill in blank

hard

Fill both blanks to define a method that clears the state dictionary.

LangChain

def clear_state(self):
    self.state.[1]()
    self.state = [2]

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

Aclear

Breset

C{}

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using reset() which is not a dictionary method.

The clear() method empties the dictionary, and reassigning {} resets it to empty.

5fill in blank

hard

Fill all three blanks to define a method that returns a copy of the current state dictionary.

LangChain

def get_state_copy(self):
    return self.state.[1]()

# Usage:
copy = memory.[2]()
print(copy.[3])

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

Acopy

Bget_state_copy

Ckeys()

Dclear

Attempts:

3 left

💡 Hint

Common Mistakes

Using clear() which empties the dictionary instead of copying.

The copy() method returns a shallow copy of the dictionary.
The method is called get_state_copy().
Using keys() on the copy returns all keys.