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Implement a function is_balanced(expression) that takes a string containing parentheses, curly braces, and square brackets,and determines whether the expression is balanced.
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An expression is considered balanced if each opening bracket has a corresponding closing bracket in the correct order.
- Write a function remove_duplicates(sequence) that takes a sequence (list or tuple) and returns a new sequence with duplicates removed while maintaining the original order of elements.
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Implement a function word_frequency(sentence) that takes a sentence and returns a dictionary containing the frequency of each word in the sentence.
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Ignore punctuation and consider words in a case-insensitive manner.
- Ron Maina
MIT License
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