81. In Pandas, which method is used to calculate the covariance between two numerical columns in a DataFrame?
82. What is the primary purpose of the "agg" method in Pandas when applying multiple aggregation functions to different columns?
83. In Python, which library is commonly used for working with time series data and performing forecasting tasks with a focus on simplicity?
84. Which Python library is often used for working with large-scale, multidimensional arrays and data manipulation in scientific computing?
85. What is the primary purpose of the "clip" method in Pandas when working with numerical data?
86. In Python, which library is commonly used for visualizing decision trees and random forests in machine learning?
87. What is the primary purpose of the "pipe" method in Pandas when chaining multiple data transformation steps?
88. In Python, which library is often used for working with graph data structures and performing graph algorithms?
89. Which Python library is commonly used for creating interactive and web-based dashboards for data analysis and visualization?
90. What is the primary purpose of the "rolling" method in Pandas when working with time series data?
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