The numpy.polymulx function multiplies the polynomial c with a value x which is the independent variable. Arguments Type Description c array_like or poly1d object The input polynomials to be multiplied The following table shows the return value of the function: Type Description Return Value ndarray or poly1d object The polynomial resulting from the multiplication of … Read more
The numpy.polymul function finds the product (multiplication) of two polynomials a1 and a2. As an input, use either poly1d objects or one-dimensional sequences of polynomial coefficients. If you use the latter, arange this polynomial sequence naturally from highest to lowest degree. Arguments Type Description a1, a2 array_like or poly1d object The input polynomials to be … Read more
What if you have a ternary operator that’s very long? Problem: How to write the ternary operator in multiple lines? Short Recap: Ternary Operator Ternary Operator: The most basic ternary operator x if c else y consists of three operands x, c, and y. It is an expression with a return value. The ternary operator … Read more
Problem: How to write the ternary operator in a lambda function? Example: Say, you’ve got the following example: The function f(x) takes one argument x and increases it by 10% if the argument is larger than 100. Otherwise, it increases it by 5%. In this article, you’ll learn how to convert this code snippet into … Read more
Problem: Given a dictionary and a key. Can you use the ternary operator to return the key from the dictionary, but only if it exists to avoid the key error? If the key doesn’t exist, a “fall-back” function should be executed. Example: Say, you want to do something like the following (pseudocode): Ternary Operator Short … Read more
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You may know the ternary operator x if c else y in Python which reads as “return x if c else return y“. But you may not know that you can also write the ternary operator in a shorter form as (y, x)[c]. Let’s dive into this concise way of hacking your own ternary operator! … Read more
Problem: Say, you have a dictionary {0: ‘Alice’, 1: ‘Bob’} and you want to create a list of dictionaries with copies of the original dictionary: [{0: ‘Alice’, 1: ‘Bob’}, {0: ‘Alice’, 1: ‘Bob’}, {0: ‘Alice’, 1: ‘Bob’}]. You use list comprehension with a “throw-away” loop variable underscore _ to create a list of 3 elements. … Read more
To create a list of n placeholder elements, multiply the list of a single placeholder element with n. For example, use [None] * 5 to create a list [None, None, None, None, None] with five elements None. You can then overwrite some elements with index assignments. In the example, lst[2] = 42 would result in … Read more
Summary: There are only three best ways to reverse the order of the list elements: list.reverse() — Best if you want to reverse the elements of list in place. list[::-1] — Best if you want to write concise code to return a new list with reversed elements. reversed(list) — Best if you want to iterate … Read more
Summary: To convert a dictionary to a list of tuples, use the dict.items() method to obtain an iterable of (key, value) pairs and convert it to a list using the list(…) constructor: list(dict.items()). To modify each key value pair before storing it in the list, you can use the list comprehension statement [(k’, v’) for … Read more
Problem: Given are two lists l1 and l2. You want to perform either of the following: 1. Boolean Comparison: Compare the lists element-wise and return True if your comparison metric returns True for all pairs of elements, and otherwise False. 2. Difference: Find the difference of elements in the first list but not in the … Read more