To resolve the “KeyError”, you need to ensure that you are referencing existing keys in the dictionary. Here are a few possible solutions:

1. Check for key existence: Before accessing a key, you can use the in keyword or the get() method to check if the key exists in the dictionary.

student = {‘name’: ‘John’, ‘age’: 20}
if ‘grade’ in student:
print(student[‘grade’])
else:
print(“Key not found”)

By using the in keyword to check for key existence, you can handle the case when the key is not present in the dictionary.

2. Use the get() method with a default value: Instead of directly accessing a key, you can use the get() method on the dictionary, which allows you to specify a default value if the key is not found.

student = {‘name’: ‘John’, ‘age’: 20}
grade = student.get(‘grade’, ‘Key not found’)
print(grade)

By providing a default value of 'Key not found' to the get() method, you can retrieve the value associated with the key if it exists in the dictionary. Otherwise, the default value will be returned.

3. Use exception handling: Another approach is to use a try-except block to catch the “KeyError” and handle it gracefully.

student = {‘name’: ‘John’, ‘age’: 20}
try:
print(student[‘grade’])
except KeyError:
print(“Key not found”)

By using a try-except block, you can catch the “KeyError” and provide an appropriate error message or perform alternative actions when the key is not present in the dictionary. Remember, it’s crucial to verify the existence of a key before accessing it to avoid “KeyError” and ensure your code behaves as intended.