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When it is required to display the letters that are present in the first string but not in the second string, two string inputs are taken from user. The ‘set’ is used to find the difference between the two strings.Python comes with a datatype known as ‘set’. This ‘set’ contains elements that are unique only.The set is useful in performing operations such as intersection, difference, union and symmetric difference.ExampleBelow is a demonstration for the same − Live Demomy_str_1 = input("Enter the first string...") my_str_2 = input("Enter the second string...") my_result = list(set(my_str_1)-set(my_str_2)) print("The letters in first string but not in second ... Read More
When it is required to create a dictionary with the key as the first character and the associated value as the word which is the starting of that character, the s’plit’ method, a dictionary and simple ‘if’ condition is used.ExampleBelow is a demonstration for the same − Live Demomy_string=input("Enter the string :") split_string = my_string.split() my_dict={} for elem in split_string: if(elem[0] not in my_dict.keys()): my_dict[elem[0]]=[] my_dict[elem[0]].append(elem) else: if(elem not in my_dict[elem[0]]): my_dict[elem[0]].append(elem) print("The dictionary created is") for k, v in my_dict.items(): print(k, ":", v)OutputEnter the ... Read More
When it is required to count the frequency of words that appear in a string with the help of dictionary, the ‘split’ method is used to split the values, and a list comprehension is used.The list comprehension is a shorthand to iterate through the list and perform operations on it.A list can be used to store heterogeneous values (i.e data of any data type like integer, floating point, strings, and so on).ExampleBelow is a demonstration for the same − Live Demomy_string = input("Enter the string :") my_list=[] my_list=my_string.split() word_freq=[my_list.count(p) for p in my_list] print("The frequency of words is ...") print(dict(zip(my_list, word_freq)))OutputEnter ... Read More
When it is required to form a dictionary with the help of an object and class, a class is defined. An ‘init’ function is defined, that assigns values to variables. An instance of the class is created, and the init function is called.ExampleBelow is a demonstration for the same − Live Democlass base_class(object): def __init__(self): self.A = 32 self.B = 60 my_instance = base_class() print("An instance of the class has been created") print(my_instance.__dict__)OutputAn instance of the class has been created {'A': 32, 'B': 60}ExplanationA ‘base_class’ is defined, and an object is passed to it.An ... Read More
When it is required to multiply all the elements in a dictionary, the key values in the dictionary are iterated over. The key is multiplied with the previous key, and output is determined.The dictionary is a set of key-value pairs.ExampleBelow is a demonstration for the same − Live Demomy_dict = {'Jane':99, 'Will':54, 'Mark':-3} my_result = 2 for key in my_dict: my_result = my_result * my_dict[key] print("The reuslt of multiplying keys in a dictionary is : ") print(my_result)OutputThe reuslt of multiplying keys in a dictionary is : -32076ExplanationA dictionary is defined.A variable is assigned a certain value.The ‘key’ in the dictionary ... Read More
When it is required to generate a dictionary that contains numbers within a given range in a specific form, the input is taken from the user, and a simple ‘for’ loop is used.ExampleBelow is a demonstration for the same − Live Demomy_num = int(input("Enter a number.. ")) my_dict = dict() for elem in range(1, my_num+1): my_dict[elem] = elem*elem print("The generated elements of the dictionary are : ") print(my_dict)OutputEnter a number.. 7 The generated elements of the dictionary are : {1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49}ExplanationThe number is taken as user input.An ... Read More
When it is required to concatenate two dictionaries into a single entity, the ‘update’ method can be used.A dictionary is a ‘key-value’ pair.Below is a demonstration for the same −Example Live Demomy_dict_1 = {'J':12, 'W':22} my_dict_2 = {'M':67} print("The first dictionary is :") print(my_dict_1) print("The second dictionary is :") print(my_dict_2) my_dict_1.update(my_dict_2) print("The concatenated dictionary is :") print(my_dict_1)OutputThe first dictionary is : {'J': 12, 'W': 22} The second dictionary is : {'M': 67} The concatenated dictionary is : {'J': 12, 'W': 22, 'M': 67}ExplanationTwo dictionaries are defined, and are displayed on the console. The ‘update’ method is called on the first dictionary by ... Read More
When it is required to reverse a string without using recursion technique, simple negative indexing can be used.Indexing helps the values to access the elements at a specific index.ExampleBelow is a demonstration for the same − Live Demomy_string = str(input("Enter a string that needs to be reversed: ")) print("The string after reversal is: ") print(my_string[::-1])OutputEnter a string that needs to be reversed: Jane The string after reversal is: enaJExplanationThe string input is taken by the user.This value is assigned to a variable.It is displayed on the console.It is negative indexed and displayed on the console.Read More
When it is required to flatten a list without using recursion technique, the lambda function, ‘sum’ method, ‘map’ method and the ‘isinstance’ method can be used.A list can be used to store heterogeneous values (i.e data of any data type like integer, floating point, strings, and so on).The ‘isinstance’ method checks to see if a given parameter belong to a specific data type or not.Anonymous function is a function which is defined without a name. In general, functions in Python are defined using ‘def’ keyword, but anonymous function is defined with the help of ‘lambda’ keyword. It takes a single ... Read More
When it is required to find the factorial of a number without using recursion, the ‘while’ loop can be used.ExampleBelow is a demonstration for the same − Live Demomy_num = int(input("Enter a number :")) my_factorial = 1 while(my_num>0): my_factorial = my_factorial*my_num my_num=my_num-1 print("The factorial of the number is : ") print(my_factorial)OutputEnter a number :7 The factorial of the number is : 5040ExplanationThe input number is takne from the user.A variable is assigned to 1.It is checked to see for being 0.If not, it is multiplied by the previous value in the variable.It is assigned to the same variable.This is ... Read More