Pandas - str.split() and Expand to Columns
• The str.split() method combined with expand=True directly converts delimited strings into separate DataFrame columns, eliminating the need for manual column assignment
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NumPy - Expand Dimensions (np.expand_dims, np.newaxis)
• np.expand_dims() and np.newaxis both add dimensions to arrays, but np.newaxis offers more flexibility for complex indexing while np.expand_dims() provides clearer intent in code
Longest Palindromic Substring: Expand Around Center
The longest palindromic substring problem asks you to find the longest contiguous sequence of characters within a string that reads the same forwards and backwards. Given ‘babad’, valid answers…
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