31. In Pandas, what method is used to calculate the mean, median, and other summary statistics for numerical columns in a DataFrame?
32. Which Python library is commonly used for working with geospatial data and creating maps and geographic visualizations?
33. What is the primary purpose of the "applymap" method in Pandas?
34. In Python, which library provides tools for working with large and multidimensional arrays and matrices and is often used in scientific computing?
35. Which Python library is commonly used for working with network data and performing network analysis tasks?
36. In Pandas, which method is used to concatenate two or more DataFrames vertically (along rows)?
37. What is the primary purpose of the "pivot_table" function in Pandas?
38. In Python, which library is commonly used for natural language processing (NLP) tasks such as text classification and sentiment analysis?
39. Which Python library is often used for deep learning tasks, including neural network construction and training?
40. In Pandas, which method is used to fill missing values in a DataFrame with specified values or a filling method?
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