51. In Pandas, what method is used to remove duplicate rows from a DataFrame based on specified columns?
52. Which Python library is commonly used for time series forecasting and anomaly detection tasks?
53. What is the primary purpose of the "pivot" method in Pandas?
54. In Python, which library is often used for natural language processing (NLP) tasks such as text tokenization and part-of-speech tagging?
55. Which Python library is commonly used for data visualization and exploration with a focus on producing informative statistical graphics?
56. What is the primary purpose of the "crosstab" function in Pandas?
57. In Python, which library provides tools for working with complex and hierarchical data structures, often used in scientific computing?
58. Which Python library is commonly used for working with SQL databases and performing SQL-like operations on dataframes?
59. What is the primary purpose of the "fillna" method in Pandas?
60. In Python, which library is often used for deep learning tasks, including neural network construction and training, with a focus on simplicity and flexibility?
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