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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to use multiple for and while loops together in Python?
You can create nested loops in python fairly easily. You can even nest a for loop inside a while loop or the other way around. For example,for i in range(5): j = i while j != 0: print(j, end=', ') j -= 1 print("")This will give the output1, 2, 1, 3, 2, 1, 4, 3, 2, 1,You can take this nesting to as many levels as you like.
Read MoreCan we change Python for loop range (higher limit) at runtime?
No, You can't modify a range once it is created. Instead what you can do is use a while loop instead. For example, if you have some code like:for i in range(lower_limit, higher_limit, step_size):# some code if i == 10: higher_limit = higher_limit + 5You can change it to:i = lower_limit while i < higher_limit: # some code if i == 10: higher_limit = higher_limit + 5 i += step_size
Read MoreHow to create a triangle using Python for loop?
There are multiple variations of generating triangle using numbers in Python. Let's look at the 2 simplest forms:for i in range(5): for j in range(i + 1): print(j + 1, end="") print("")This will give the output:1 12 123 1234 12345You can also print numbers continuously using:start = 1 for i in range(5): for j in range(i + 1): print(start, end=" ") start += 1 print("")This will give the output:1 2 3 4 5 6 7 8 9 10 11 12 13 14 15You can also print these numbers in reverse using:start = 15 for i in range(5): for j in range(i + 1): print(start, end=" ") start -= 1 print("")This will give the output:15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Read MoreHow do I run two python loops concurrently?
You will need to use a multiprocessing library. You will need to spawn a new process and provide the code to it as an argument. For example,from multiprocessing import Processdef loop_a(): for i in range(5): print("a") def loop_b(): for i in range(5): print("b") Process(target=loop_a).start() Process(target=loop_b).start()This might process different outputs at different times. This is because we don't know which print will be executed when.
Read MoreHow to write inline if statement for print in Python?
Python provides two ways to write inline if statements. These are:1. if condition: statement2. s1 if condition else s2Note that second type of if cannot be used without an else. Now you can use these inline in a print statement as well. For example,a = True if a: print("Hello")This will give the output:Helloa = False print("True" if a else "False")This will give the output:False
Read MoreWhere to put comments in an if...elif..else construct?
You can put comments anywhere in an if...elif...else statement, ie before each of these blocks or within each of these blocks. Note that you cannot put multiline comments before elif and else blocks though, as these comments are actually strings which imply a break in the whole construct. For example,# If check if True: # Another Comment style print("If block") # Else if statement elif False: # Another Comment style print("elif block") # Else else: # Another Comment style print("Else block")This will give the output:If block
Read MoreHow to comment each condition in a multi-line if statement in Python?
You can do this directly if you are surrounding your multiline if statements conditions in a parenthesis. For example,if (cond1 == 'val1' and cond2 == 'val2' and # Some comment cond3 == 'val3' and # Some comment cond4 == 'val4'):However, this is not possible if you try to do this without a parenthesis. For example, the following code will give an error:if cond1 == 'val1' and \ cond2 == 'val2' and \ # Some comment cond3 == 'val3' and \ # Some comment cond4 == 'val4':
Read MoreWhat is python .. ("dot dot") notation syntax?
There is no special .. ("dot dot") notation syntax in python. You can, however, see this in case of floats accessing their properties. For example,f = 1..__truediv__ # or 1..__div__ for python 2 print(f(8))This will give the output:0.125What we have is a float literal without the trailing zero, which we then access the __truediv__ method of. It's not an operator in itself; the first dot is part of the float value, and the second is the dot operator to access the object's properties and methods. This can also be achieved using:>>> f = 1. >>> f 1.0 >>> f.__truediv__
Read MoreWhat is the associativity of Python's ** operator?
From the Python docs:Operators in the same box group left to right (except for comparisons), including tests, which all have the same precedence and chain from left to right — see section Comparisons — and exponentiation, which groups from right to left).So the ** operator(exponentiation) is right to left associative. For example,2 ** 3 ** 4 will be evaluated as: (2 ** (3 ** 4))For example,print(2 ** 3 ** 0)This will give the output:2
Read MoreHow to pass a function as a parameter in Java
Yes. From Java 8 onwards, we can do so using method references.Method references help to point to methods by their names. A method reference is described using "::" symbol. A method reference can be used to point the following types of methods −Static methodsInstance methodsConstructors using new operator (TreeSet::new)Method Reference ExampleCreate the following Java program using any editor of your choice in, say, C:\> JAVA.Java8Tester.java Live Demo import java.util.List; import java.util.ArrayList; public class Java8Tester { public static void main(String args[]) { List names = new ArrayList(); names.add("Mahesh"); names.add("Suresh"); names.add("Ramesh"); ...
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