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Page 2042 of 2109
How does == operator works in Python 3?
The == symbol is defined as equality operator. It returns true if expressions on either side are equal and false if they are not equal>>> (10+2) == 12 True >>> 5*5 == 5**2 True >>> (10/3)==3 False >>> 'computer'=="computer" True >>> 'COMPUTER'.lower()=='computer' True
Read Morelist begin( ) and list end( ) in C++ STL
Given is the task to show the functionality list begin( ) and list end( ) function in C++ in STL.What is List in STLList is a data structure that allows constant time insertion and deletion anywhere in sequence. Lists are implemented as doubly linked lists. Lists allow non-contiguous memory allocation. List perform better insertion extraction and moving of element in any position in container than array, vector and deque. In List the direct access to the element is slow and list is similar to forward_list, but forward list objects are single linked lists and they can only be iterated forwards.What ...
Read MoreWhat does 'is not' operator do in Python?
In Python, is and is not operators are called identity operators. Each object in computer's memory is assigned a unique identification number (id) by Python interpreter. Identity operators check if id() of two objects is same. 'is not' operator returns true of id() values are different and false if they are same.>>> a=10 >>> b=a >>> id(a), id(b) (490067904, 490067904) >>> a is not b False >>> a=10 >>> b=20 >>> id(a), id(b) (490067904, 490068064) >>> a is not b True
Read MoreWhat does 'in' operator do in Python?
In Python, in and not in operators are called membership operators. Their purpose is to check if an object is a member of a certain sequence object like string, list, or tuple. The in operator returns true if object is present in sequence, false if not found>>> 'p' in 'Tutorialspoint' True >>> 'c' in 'Tutorialspoint' False >>> 10 in range(0,5) False
Read MoreHow do we convert a string to a set in Python?
Python’s standard library contains built-in function set() which converts an iterable to set. A set object doesn’t contain repeated items. So, if a string contains any character more than once, that character appears only once in the set object. Again, the characters may not appear in the same sequence as in the string as set() function has its own hashing mechanism>>> set("hello") {'l', 'h', 'o', 'e'}
Read MoreHow to create an unordered_set of user defined class or struct in C++?
In this tutorial, we will be discussing a program to understand how to create an unordered set of user defined class or struct in C++.For this we will create a structure type and then compare two structure types with the function defined by the user to store the hash function.Example#include using namespace std; //defined structure struct Test { int id; bool operator==(const Test& t) const{ return (this->id == t.id); } }; //defined class for hash function class MyHashFunction { public: size_t operator()(const Test& t) const{ ...
Read MoreHow to convert an object x to a string representation in Python?
Most commonly used str() function from Python library returns a string representation of object.>>> no=100 >>> str(no) '100' >>> L1=[1,2,3,4] >>> str(L1) '[1, 2, 3, 4]' >>> d={'a': 1, 'b': 2, 'c': 3, 'd': 4} >>> str(d) "{'a': 1, 'b': 2, 'c': 3, 'd': 4}"However, repr() returns a default and unambiguous representation of the object, where as str() gives an informal representation that may be readable but may not be always unambiguous.>>> str(d) "{'a': 1, 'b': 2, 'c': 3, 'd': 4}" >>> repr(d) "{'a': 1, 'b': 2, 'c': 3, 'd': 4}" >>> repr(L1) '[1, 2, 3, 4]' >>> repr(no) '100'
Read MoreHow to Find the Sum of Natural Numbers using Python?
You can use while loop to successively increment value of a variable i by one and adding it cumulatively.s,i=0,0 n=10 while i
Read MoreHow to generate armstrong numbers in Python?
Any three digit number is called an Armstrong number of sum of cube of its digits equals the number itself. In order to check if a number satisfies this condition, each digit from it is successively separated from right and its cube is cumulatively added. In the end if the sum is found to be equal to original number, it is called Armstrong number.ExampleFollowing Python code prints all armstrong numbers between 100 to 999for num in range(100, 1000): temp=num sum=0 while temp>0: digit=temp%10 sum=sum+digit**3 temp=temp//10 if sum==num: ...
Read MoreHow to get the number of capture groups in Python regular expression?
The following code gets the number of captured groups using Python regex in given stringExampleimport re m = re.match(r"(\d)(\d)(\d)", "632") print len(m.groups())OutputThis gives the output3
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