41. What is the primary purpose of the "merge" function in Pandas?
42. In Python, which library provides tools for working with complex data structures and data manipulation, often used for data analysis in the financial sector?
43. Which Python library is commonly used for creating interactive data dashboards and reports for data analysis and visualization?
44. What is the primary purpose of the "stack" method in Pandas?
45. In Python, which library provides tools for working with graph data structures and performing graph analysis tasks?
46. In Pandas, which method is used to calculate the mode of a numerical column in a DataFrame?
47. Which Python library is commonly used for data preprocessing tasks, such as feature scaling and transformation in machine learning?
48. What is the primary purpose of the "groupby" method in Pandas when working with categorical data?
49. In Python, which library is commonly used for web scraping and extracting data from websites?
50. What Python function is used to create a new column in a Pandas DataFrame based on the values of existing columns?
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