Python Building Higher-Order Functions. You can define higher-order functions by creating a Callable class object. Similar to writing generator functions, creating a callable object allows you to use Python statements. In addition to using statements, you can also statically configure…
Python Serialize data to JSON or CSV format. The JSON and CSV serializers are similar in that they both rely on Python libraries for serialization. These libraries are imperative in nature, so function bodies consist of a strict sequence of…
Python Product reduction. In relational database theory, the join operation between tables can be viewed as a Cartesian product with a filter condition. In an SQL statement, if the SELECT statement is not followed by a WHERE clause, the result…
Python Finding Matching Patterns. The above technique of creating multiple condition sets can also be used with regular expressions. Recall that the match() method or the search() method of a pattern returns a match object or a None value. You…
Python Calculating the Probability of Random Distribution, with the incomplete gamma function gamma and the complete gamma function Gamma_Half, we can calculate the CDF value of x^2. This value indicates whether a given value is random or has some correlation.…
Python Flattening Sequences: Sometimes compressed data needs to be flattened into a one-dimensional sequence. For example, the input file structure may be as follows: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53…
Python Specified Memoization. The basic idea of memoization is very simple and can be captured using the @lru_cache decorator. This decorator can be applied to any function to implement memoization. In some cases, this general idea can be improved in…
Parsing XML Files with Python First, we parse an XML (Extensible Markup Language) file to obtain the raw latitude and longitude data. This process demonstrates how to encapsulate some of Python’s less functional language features to generate an iterable sequence.…
Python Functions are First-Class Objects. As mentioned previously, Python functions are first-class objects, ordinary objects with some attributes. For more information on the special methods available on function objects, see the Python Language Reference Manual. Similar to how you get…
Higher-order functions can be divided into the following three categories. Functions that take functions as arguments. Functions that return functions, such as the Callable class. Functions that return generator expressions can also be considered higher-order functions. Functions that take functions…