I’ve created an array that holds all possible html tag which when run would navigate to the target string or nothing. group = [‘div’,’span’,’a’,’link’,’dl’,’dt’,’dd’,’b’,’p’,’meta’,”] comb = [] for g1 in group: if g1 != ”: for g2 in group: if g2 != ”: for g3 in group: if g3 != ”: res = “tag.”+g1+”.”+g2+”.”+g3+”.string” comb.append(res) […]

# Tag: B

Say I have a dictionary and some of the keys are values in a separate array, how do I sort the values in my array by the values for their respective keys in the dictionary? For example: input: dict = {‘a’: 4, ‘b’: 7, ‘c’: 10, ‘d’: 1} array = [a, b, d] output: array […]

I often find myself looping over some long INPUT list (or dataframe, or dictionary). Per iteration I do some calculations on the input data, I then push the results into some OUTPUT data structure. Often the final output is a dataframe (since it is convenient to deal with). Below are two methods that loop over […]

In a tree structure, what’s a good term for the predicate f(x, y) defined in human language as “x is an ancestor of or identical to y”? The phrase “ancestor of or identical to” is so wordy. Example Given the tree: A / \ B E / \ C D Then f(x, C) is satisfied […]

I am facing an issue regarding sort being killed due over usage of memory and can not understand why it surpasses the given limit by a significant margin. Context: Available physical RAM: 8GB Memory in use by system: <500MB (FreeBSD 13) Free memory: ~7.5GB Swap: 2G No system hard limit on mem usage ($ ulimit […]

I have simple list which is dynamically added on add button click. in my list there is a checkbox is also present .so I have an issue when I toggle the checkbox my whole list is re render why ? let take example I added A,B,C,D in my list when I toggle D checkbox it […]

I am studying basic concepts of metrics. and I ve been practicing axioms of metrics to prove some functions can be metrics or not. then this question showed up and I do not understand what am I being asked for. how is related to axioms of metric? am i supposed to find a function? $X=\{a,b,c\}$ […]

Given $f(x,y) \in C^2([0,1]^2)$ (by which I mean $C^2$ in some open neighborhood), with $f_x, f_y, f_{xy} \in L^1([0,1]^2, dxdy)$ (which is sure case since they are continuous), does the following hold? $$ \sup |f| \le \iint |f|+|f_x|+|f_y|+|f_{xy}|\, dxdy $$ I think it is safe to discretise this function under the assumptions, divide $f$ into […]

I know given $a,b,c\in\mathbb Z$ then is there $x,y\in\mathbb N$ with $$ax^2+by+c=0$$ is $\mathsf{NP}$-hard. However if $y\in\mathbb Z$, factorization of $b$ is known and $a=1$ then does the problem remain $\mathsf{NP}$ hard if $|y|<T$ holds (inputs are $b$, prime factors of $b$, $c$ and $T$)? Does it make a difference if factorization of $b$ is […]