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Q.1 Name some common data structures of python’s pandas library. Q.2 Given a list L=[3,4,5] and an ndarray N having elements 3,4,5. ... Q.4 Why does python change the datatype of a column as soon as it stores an empty value(NaN) even though it has all other values stored as integer. ... Name the column that might have a Unique constraint ...
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Pandas: is an open source Python library used for statistical analytics and data manipulation such as reshaping, slicing aggregations and filtering. Pandas offers data structures and data analysis tools, which is built to cover the limitation of Python programming coding (Pandas, 2019).
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Counting the number of the animals is as easy as applying a count function on the zoo dataframe using zoo.count(). Actually, the .count() function counts the number of values in each column. In the case of the zoo dataset, there were 3 columns, and each of them had 22 values in it.
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Variable spr is the variable of interest (e.g. turnover). Variable pris_datum tells us when the information became available or was received. Variable id has different values for each enterprise (e.g. P1000002, where 1000002 means the second company of the first source). Variable tip_pod can have values s (raw data) or u (edited data).
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Count values can be calculated using ‘count’ method on the grouped data. For weighted average calculations, use numpy average function (with weights parameter) on the applicable dataframe series via apply method . Convert the output generated using apply method to a dataframe using ‘DataFrame’ pandas method. Specify the column names ...
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A frequency matching function that searches through the logs for unique instances of specific row in each column and assigning each a numerical value. The Bag of Words representation Count Vectorization from scikit-learn: This tokenizes each unique word in the logs and assigns it a unique numeral value (Scikit-learn.org)
unique values in a column pandas

Python pandas count unique values in column