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Page 2043 of 2109
How to write Python regular expression to get all the anchor tags in a webpage?
The following code extracts all tags in the given stringExampleimport re rex = re.compile(r'[\]') l = "this is text1 hi this is text2" print rex.findall(l)Output['', '']
Read MoreHow to use wildcard in Python regular expression?
The following code uses the Python regex .()dot character for wildcard which stands for any character other than newline.Exampleimport re rex = re.compile('th.s') l = "this, thus, just, then" print rex.findall(l)OutputThis gives the output['this', 'thus']
Read MoreHow to find all adverbs and their positions in a text using python regular expression?
As per Python documentationIf one wants more information about all matches of a pattern than the matched text, finditer() is useful as it provides match objects instead of strings. If one was a writer who wanted to find all of the adverbs and their positions in some text, he or she would use finditer() in the following manner −>>> text = "He was carefully disguised but captured quickly by police." >>> for m in re.finditer(r"\w+ly", text): ... print('%02d-%02d: %s' % (m.start(), m.end(), m.group(0))) 07-16: carefully 40-47: quickly
Read MoreHow to extract numbers from text using Python regular expression?
If we want to extract all numbers/digits individually from given text we use the following regexExampleimport re s = '12345 abcdf 67' result=re.findall(r'\d', s) print resultOutput['1', '2', '3', '4', '5', '6', '7']If we want to extract groups of numbers/digits from given text we use the following regexExampleimport re s = '12345 abcdf 67' result=re.findall(r'\d+', s) print resultOutput['12345', '67']
Read MoreHow to insert a Python tuple in a PostgreSql database?
PostgreSql database is by default installed on port number 5432. Python interface to PostgreSql is provided by installing psycopg2 module. Assuming that test database and employee table with fname, sname, age, gender and salary fields is available.First establish connection and obtain cursor object by following statements in Python script.import psycopg2 conn = psycopg2.connect(database = "test", user = "postgres", password = "pass123", host = "localhost", port = "5432") cur = conn.cursor()Data to be inserted in employee table is stored in the form of tuple objectt1=('Mac', 'Mohan', 20, 'M', 2000)Next set up the insert query using this tuplesql="insert into employee values(%s, %s, ...
Read MoreCan we explicitly define datatype in a Python Function?
Yes, in Python, you can explicitly define the datatype of function parameters and return values using type hints or type annotations. Even if you specify the data types using type hints, Python will still run the code even when the wrong types are passed. The execution of the program will not be interrupted, and an error will not be raised.To find these type-related mistakes, you can use tools like mypy or pyright that check your code before it runs. Using Type Hints in Python Functions To add type hints to a parameter of a function, you need to specify the ...
Read MoreC++ Program to Sort an Array of 10 Elements Using Heap Sort Algorithm
Heap Sort is based on the binary heap data structure. In the binary heap the child nodes of a parent node are smaller than or equal to it in the case of a max heap, and the child nodes of a parent node are greater than or equal to it in the case of a min heap.An example that explains all the steps in Heap Sort is as follows.The original array with 10 elements before sorting is −207154101590237725This array is built into a binary max heap using max-heapify. This max heap represented as an array is given as follows.907720542515123710The root ...
Read MoreWhat is "Argument-Dependent Lookup" ("Koenig Lookup") in C++?
Argument-dependent lookup(ADL) is a protocol for looking up unqualified function names in function-call expressions.These function call expressions include implicit function calls to overloaded operators.The function names are looked up in the namespaces of their arguments in addition to the scopes and namespaces considered by the usual unqualified name lookup. Argument-dependent lookup makes it possible to use operators defined in a different namespace. Examplenamespace MyNamespace{ class A {}; void f( A &a, int i) {} } int main() { MyNamespace::A a; f( a, 0 ); //calls MyNamespace::f }The lookup of a function call to f was dependent ...
Read MoreRead a character from standard input without waiting for a newline in C++
A portable solution doesn't exist for doing this. On windows, you can use the getch() function from the conio(Console I/O) library to get characters pressed.example#include #include using namespace std; int main() { char c; while(1){ // infinite loop c = getch(); cout
Read MoreSorting a vector of custom objects using C++ STL
You can sort a vector of custom objects using the C++ STL function std::sort. The sort function has an overloaded form that takes as arguments first, last, comparator. The first and last are iterators to first and last elements of the container. The comparator is a predicate function that can be used to tell how to sort the container. example#include #include #include using namespace std; struct MyStruct { int key; string data; MyStruct(int key, string data) { this -> key = key; this -> data = data; } }; int ...
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