Dictionaries: Storing Student Grades
Dictionaries in Python are powerful tools for organizing and managing data where each value is associated with a unique key. In a classroom setting, dictionaries are especially useful for mapping student names to their grades. This structure allows you to quickly look up, update, or add information about each student without searching through lists or relying on the order of data. By using dictionaries, you can ensure that each student's grade is efficiently stored and easily accessible, making grade management straightforward and reliable.
12345678910# Create a dictionary with student names as keys and their grades as values grades = { "Alice": 88, "Bob": 92, "Charlie": 79, "Diana": 95 } # Print the dictionary of grades print(grades)
With a dictionary, you can perform several essential operations. To add a new student's grade, simply assign a value to a new key: for example, grades["Evan"] = 85 will add Evan's grade to the dictionary. Updating an existing grade is just as easy—assign a new value to a current key, such as grades["Alice"] = 90 to update Alice's grade. Retrieving a student's grade is done using the key in square brackets, like grades["Bob"], which will return Bob's grade. These operations allow you to keep your gradebook accurate and up-to-date with minimal effort.
123456# Update a student's grade grades["Alice"] = 90 # Alice's grade is now 90 # Retrieve another student's grade bobs_grade = grades["Bob"] print("Bob's grade:", bobs_grade)
1. What is the main advantage of using dictionaries for storing grades?
2. How do you access a value in a dictionary using a key?
3. What happens if you try to access a key that does not exist in a dictionary?
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Dictionaries in Python are powerful tools for organizing and managing data where each value is associated with a unique key. In a classroom setting, dictionaries are especially useful for mapping student names to their grades. This structure allows you to quickly look up, update, or add information about each student without searching through lists or relying on the order of data. By using dictionaries, you can ensure that each student's grade is efficiently stored and easily accessible, making grade management straightforward and reliable.
12345678910# Create a dictionary with student names as keys and their grades as values grades = { "Alice": 88, "Bob": 92, "Charlie": 79, "Diana": 95 } # Print the dictionary of grades print(grades)
With a dictionary, you can perform several essential operations. To add a new student's grade, simply assign a value to a new key: for example, grades["Evan"] = 85 will add Evan's grade to the dictionary. Updating an existing grade is just as easy—assign a new value to a current key, such as grades["Alice"] = 90 to update Alice's grade. Retrieving a student's grade is done using the key in square brackets, like grades["Bob"], which will return Bob's grade. These operations allow you to keep your gradebook accurate and up-to-date with minimal effort.
123456# Update a student's grade grades["Alice"] = 90 # Alice's grade is now 90 # Retrieve another student's grade bobs_grade = grades["Bob"] print("Bob's grade:", bobs_grade)
1. What is the main advantage of using dictionaries for storing grades?
2. How do you access a value in a dictionary using a key?
3. What happens if you try to access a key that does not exist in a dictionary?
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