When it is required to find the redundancy rates for every row of a matrix, a simple iteration and the ‘append’ method can be used.ExampleBelow is a demonstration of the samemy_list = [[91, 52, 12, 29, 33], [54, 54, 54, 54, 54], [11, 22, 33, 59, 95]] print("The list is :") print(my_list) my_result = [] for sub in my_list:    my_result.append(1 - len(set(sub)) / len(sub)) print("The result is :") print(my_result)OutputThe list is : [[91, 52, 12, 29, 33], [54, 54, 54, 54, 54], [11, 22, 33, 59, 95]] The result is : [0, 1, 0]ExplanationA list of ... Read More

When it is required to change the signs of the elements in a list of tuple, a simple iteration, the ‘abs’ method and the ‘append’ method can be used.ExampleBelow is a demonstration of the samemy_list = [(51, -11), (-24, -24), (11, 42), (-12, 45), (-45, 26), (-97, -4)] print("The list is :") print(my_list) my_result = [] for sub in my_list: my_result.append((abs(sub[0]), -abs(sub[1]))) print("The result is :") print(my_result)OutputThe list is : [(51, -11), (-24, -24), (11, 42), (-12, 45), (-45, 26), (-97, -4)] The result is : [(51, -11), (24, -24), (11, -42), (12, -45), (45, ... Read More

When it is required to convert a list to a set based on a specific common element, a method can be defined that iterates through the set using ‘enumerate’ and places a specific condition on the elements. The ‘union’ method and the ‘map’ methods are used.ExampleBelow is a demonstration of the samedef common_elem_set(my_set):    for index, val in enumerate(my_set):       for j, k in enumerate(my_set[index + 1:], index + 1): if val & k: my_set[index] = ... Read More

When it is required to convert a list into a list of lists using a step value, a method is defined that uses a simple iteration, the ‘split’ method and the ‘append’ method.ExampleBelow is a demonstration of the samedef convert_my_list(my_list): my_result = [] for el in my_list: sub = el.split(', ') my_result.append(sub) return(my_result) my_list = ['peter', 'king', 'charlie'] print("The list is :") print(my_list) print("The resultant list is :") print(convert_my_list(my_list))OutputThe list is : ['peter', 'king', 'charlie'] The ... Read More

When it is required to find the cube of each list element, a simple iteration and the ‘append’ method are used.ExampleBelow is a demonstration of the samemy_list = [45, 31, 22, 48, 59, 99, 0] print("The list is :") print(my_list) my_result = [] for i in my_list: my_result.append(i*i*i) print("The resultant list is :") print(my_result)OutputThe list is : [45, 31, 22, 48, 59, 99, 0] The resultant list is : [91125, 29791, 10648, 110592, 205379, 970299, 0]ExplanationA list is defined and is displayed on the console.An empty list is defined.The original list is iterated over.Every element ... Read More

When it is required to print all the words occurring in a sentence exactly K times, a method is defined that uses the ‘split’ method, ‘remove’ method and the ‘count’ methods. The method is called by passing the required parameters and output is displayed.ExampleBelow is a demonstration of the samedef key_freq_words(my_string, K):    my_list = list(my_string.split(" "))    for i in my_list:       if my_list.count(i) == K:          print(i)          my_list.remove(i) my_string = "hi there how are you, how are u" K = 2 print("The string is :") print(my_string) print"The repeated ... Read More

When it is required to customize the space size padding in a list of strings, an empty list, an iteration and the ‘append’ method is used.ExampleBelow is a demonstration of the samemy_list = ["Python", "is", "great"] print("The list is :") print(my_list) lead_size = 3 trail_size = 2 my_result = [] for elem in my_list: my_result.append((lead_size * ' ') + elem + (trail_size * ' ')) print("The result is :") print(my_result)OutputThe list is : ['Python', 'is', 'great'] The result is : [' Python ', ' is ', ' great ']ExplanationA list is defined and ... Read More

When it is required to find the first occurrence of one list in another list, the ‘set’ attribute and the ‘next’ method is used.ExampleBelow is a demonstration of the samemy_list_1 = [23, 64, 34, 77, 89, 9, 21] my_list_2 = [64, 10, 18, 11, 0, 21] print("The first list is :") print(my_list_1) print("The second list is :") print(my_list_2) my_list_2 = set(my_list_2) my_result = next((ele for ele in my_list_1 if ele in my_list_2), None) print("The result is :") print(my_result)OutputThe first list is : [23, 64, 34, 77, 89, 9, 21] The second list is : [64, 10, 18, ... Read More

To merge Pandas DataFrame, use the merge() function. The inner join is implemented on both the DataFrames by setting under the “how” parameter of the merge() function i.e. −how = “inner”At first, let us import the pandas library with an alias −import pandas as pd Create DataFrame1 −dataFrame1 = pd.DataFrame( { "Car": ['BMW', 'Lexus', 'Audi', 'Mustang', 'Bentley', 'Jaguar'], "Units": [100, 150, 110, 80, 110, 90] } ) Now, create DataFrame2 −dataFrame2 = pd.DataFrame( { ... Read More

To calculate the variance of column values, use the var() method. At first, import the required Pandas library −import pandas as pdCreate a DataFrame with two columns −dataFrame1 = pd.DataFrame(    { "Car": ['BMW', 'Lexus', 'Audi', 'Tesla', 'Bentley', 'Jaguar'],       "Units": [100, 150, 110, 80, 110, 90] } ) Finding Variance of "Units" column values using var() function −print"Variance of Units column from DataFrame1 = ", dataFrame1['Units'].var()In the same way, we have calculated the Variance from the 2nd DataFrame.ExampleFollowing is the complete code −import pandas as pd ... Read More