Complex number is made up of real and imaginary parts. Real part is a float number, and imaginary part is any float number multiplied by square root of -1 which is defined as j.>>> no=5+6j >>> no.real 5.0 >>> no.imag 6.0 >>> type(no) The resulting object is of complex data type. Python library also has complex() function, which forms object from two float arguments>>> no=complex(5,6) >>> no (5+6j) >>> no.real 5.0 >>> no.imag 6.0 >>> type(no)

By using the eval() function in python we can evaluate a string and return a python object. The eval() is a python built−In function that evaluates a string argument by parsing the string as a code expression. Syntax eval(expression[, globals[, locals]]) Parameters expression: It’s a string that will be evaluated as a Python expression. globals: An optional parameter, which is a dictionary containing global parameters. locals: An optional parameter, which is a dictionary containing local parameters. Return: Returns the result evaluated from the expression. If the string containing arithmetic expression If we pass a string ... Read More

We can convert a python string into tuple by simply mentioning a comma (, ) after the string. This will treat the string as a single element to the tuple. Here our string variable “s” is treated as one item in the tuple, which can be done by adding the comma after the string. Example s = "python" print("Input string :", s) t = s, print('Output tuple:', t) print(type(t)) Output Following is the output of the above program Input string : python Output tuple: ('python', ) Using tuple() function Also we can use the tuple() function ... Read More

The double star/asterisk (*) operator has more than one meaning in Python. We can use it as a exponential operator, used as function *kwargs, unpacking the iterables, and used to Merge the Dictionaries. Exponential operator For numeric data the double asterisk (**) is used as an exponential operator. Let's take an example and see how the double star operator works on numeric operands. Example The following example uses double asterisks/star (**) to calculate “a to the power b” and it works equivalent to the pow() function. a = 10 b = 2 result = a ** b print("a**b = ", ... Read More

In Python, a list is an ordered sequence that can hold several object types such as integer, character, or float. In other programming languages, a list is equivalent to an array. In this article, we will show you how to get the size/length of a list in different ways using Python. Here we see 4 methods − Using len() function Using For Loop (Naïve Method) Using length_hint() function Using __len__() function Assume we have taken a list containing some elements. We will return the length/size of the given input list using different methods as specified above. Method 1: ... Read More

The asterisk (*) operator in Python has more than one meaning attached to it. We can use it as a Multiplication operator, Repetition operator, used for Unpacking the iterables, and Used as function *args. Single asterisk as used in function declaration allows variable number of arguments passed from calling environment. Inside the function it behaves as a tuple. As the multiplication operator Generally, the start (*) operator is used for multiplication purposes. For numeric data the asterisk (*) is used as a multiplication operator. Let’s take an example and see how the star operator works on numeric operands. Example a ... Read More

By using the dict() method in python we can create a python dictionary with the list comprehension. The syntax of dict() method is given below. Following is the syntax for this dict(**kwarg) Keyword arguments. We can pass one or more keyword arguments. If no keyword argument is passed then the dict() method will create an empty dictionary object. The syntax for creating a dictionary with list comprehension: dict(list_comprehension) Creating dictionary using list comprehension Instead of sending a number of keywords here we need to send a list of tuples with key value pairs to the dict() method. Let’s ... Read More

While creating a function the single asterisk (*) defined to accept and allow users to pass any number of positional arguments. And in the same way the double asterisk (**) defined to accept any number of keyword arguments. The single asterisk (*) can be used when we are not sure how many arguments are going to be passed to a function and those arguments that are not keywords. The double asterisk (**kwargs) can be used to pass keywords, when we don't know how many keyword arguments will be passed to a function, which will be in a dict named ... Read More

You can either setLength to be 0 or create a new StringBuilder() instance. See the example below −Examplepublic class Tester {    public static void main(String[] args) {       StringBuilder builder = new StringBuilder();       builder.append("sample");       System.out.println(builder.toString());       builder.setLength(0);       System.out.println(builder.toString());       builder.append("sample");       System.out.println(builder.toString());    } }Outputsample sample

Performance wise, there is hardly any difference. But it is good to keep a variable local to the scope it is used. So declaring a variable inside Java loop is generally preferred.