When it is required to get the row with minimum difference in extreme values, list comprehension, the ‘min’ method and ‘max’ methods are used.ExampleBelow is a demonstration of the samemy_list = [[41, 1, 38], [25, 33, 1], [13, 44, 65], [1, 22]] print("The list is : ") print(my_list) my_min_val = min([max(elem) - min(elem) for elem in my_list]) my_result = [elem for elem in my_list if max(elem) - min(elem) == my_min_val] print("The result is : ") print(my_result)OutputThe list is : [[41, 1, 38], [25, 33, 1], [13, 44, 65], [1, 22]] The result is : [[1, 22]]ExplanationA ... Read More

To filter DataFrame by time, use the loc and set the condition in it to fetch records. At first, import the required library −import pandas as pdCreate a Dictionary of list with date records −d = {'Car': ['BMW', 'Lexus', 'Audi', 'Mercedes', 'Jaguar', 'Bentley'], 'Date_of_Purchase': ['2021-07-10', '2021-08-12', '2021-06-17', '2021-03-16', '2021-05-19', '2021-08-22'] }Creating a dataframe from the above dictionary of lists −dataFrame = pd.DataFrame(d) Now, let’s say we need to fetch cars purchased after a specific date. For this, we use loc −resDF = dataFrame.loc[dataFrame["Date_of_Purchase"] > "2021-07-15"]ExampleFollowing is the complete code −import pandas as pd # dictionary of ... Read More

When it is required to remove palindromic elements from a list, list comprehension and the ‘not’ operator are used.ExampleBelow is a demonstration of the samemy_list = [56, 78, 12, 32, 4, 8, 9, 100, 11] print("The list is : ") print(my_list) my_result = [elem for elem in my_list if int(str(elem)[::-1]) not in my_list] print("The result is : " ) print(my_result)OutputThe list is : [56, 78, 12, 32, 4, 8, 9, 100, 11] The result is : [56, 78, 12, 32, 100]ExplanationA list is defined and displayed on the console.A list comprehension is used to iterate over the ... Read More

Use the group.size() to count the number of rows in each group. Import the required library −import pandas as pdCreate a DataFrame −dataFrame = pd.DataFrame({'Product Category': ['Computer', 'Mobile Phone', 'Electronics', 'Electronics', 'Computer', 'Mobile Phone'], 'Quantity': [10, 50, 10, 20, 25, 50], 'Product Name': ['Keyboard', 'Charger', 'SmartTV', 'Camera', 'Graphic Card', 'Earphone'] })Group by columns −dataFrame.groupby(["Product Category", "Quantity"]) Now, count the group size to get the count of rows in each group.ExampleFollowing is the complete code −import pandas as pd # create a dataframe dataFrame = pd.DataFrame({'Product Category': ['Computer', 'Mobile Phone', 'Electronics', 'Electronics', 'Computer', 'Mobile Phone'], 'Quantity': [10, 50, 10, 20, ... Read More

When it is required to split ‘N’ sized substrings with ‘K’ distinct characters, it is iterated over, and the ‘set’ method is used to get the different combinations.ExampleBelow is a demonstration of the samemy_string = 'Pythonisfun' print("The string is : ") print(my_string) my_substring = 2 my_chars = 2 my_result = [] for idx in range(0, len(my_string) - my_substring + 1): if (len(set(my_string[idx: idx + my_substring])) == my_chars): my_result.append(my_string[idx: idx + my_substring]) print("The resultant string is : ") print(my_result)OutputThe string is : Pythonisfun The resultant string is : ['Py', 'yt', ... Read More

When it is required to merge dictionaries list with duplicate keys, the keys of the strings are iterated over and depending on the condition, the result is determined.ExampleBelow is a demonstration of the samemy_list_1 = [{"aba": 1, "best": 4}, {"python": 10, "fun": 15}, {"scala": "fun"}] my_list_2 = [{"scala": 6}, {"python": 3, "best": 10}, {"java": 1}] print("The first list is : ") print(my_list_1) print("The second list is : ") print(my_list_2) for i in range(0, len(my_list_1)):    id_keys = list(my_list_1[i].keys())    for key in my_list_2[i]:       if key not in id_keys: ... Read More

To sort data in ascending or descending order, use sort_values() method. For descending order, use the following in the sort_values() method −ascending=FalseImport the required library −import pandas as pd Create a DataFrame with 3 columns −dataFrame = pd.DataFrame(    {       "Car": ['BMW', 'Lexus', 'BMW', 'Mustang', 'Mercedes', 'Lexus'], "Reg_Price": [7000, 1500, 5000, 8000, 9000, 2000], "Place": ['Pune', 'Delhi', 'Mumbai', 'Hyderabad', 'Bangalore', 'Chandigarh'] } )To sort DataFrame in descending order according to the element frequency, we need to count the occurrences. Therefore, count() is also used with sort_values() set for descending order sort −dataFrame.groupby(['Car'])['Reg_Price'].count().reset_index(name='Count').sort_values(['Count'], ascending=False)ExampleFollowing is ... Read More

Use pop() to pop the column and insert it using the insert() methodi.e. moving a column. At first, create a DataFrame with 3 columns −dataFrame = pd.DataFrame(    {       "Student": ['Jack', 'Robin', 'Ted', 'Marc', 'Scarlett', 'Kat', 'John'], "Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass'], "Roll Number": [ 5, 10, 3, 8, 2, 9, 6] } ) Move column "Roll Number" to 1st position by first popping the column out −shiftPos = dataFrame.pop("Roll Number")Insert column on the 1st position −dataFrame.insert(0, "Roll Number", shiftPos) ExampleFollowing is the code −import pandas as pd # ... Read More

We will see how to display only non-duplicated values. At first, we will create a DataFrame with duplicate values −dataFrame = pd.DataFrame(    {       "Student": ['Jack', 'Robin', 'Ted', 'Robin', 'Scarlett', 'Kat', 'Ted'], "Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass'] } )Above, we have created 2 columns. To display only non-duplicated values, use the duplicated() method and logical NOT. Through this, non-duplicated values will be fetched −dataFrame[~dataFrame.duplicated('Student')] ExampleFollowing is the complete code −import pandas as pd # Create DataFrame dataFrame = pd.DataFrame(    {       "Student": ['Jack', 'Robin', 'Ted', 'Robin', 'Scarlett', ... Read More

We can easily reshape the data by categorizing a specific column. Here, we will categorize the “Result”column i.e. Pass and Fail values in numbers form.Import the required library −import pandas as pdCreate a DataFrame with 2 columns −dataFrame = pd.DataFrame(    {       "Student": ['Jack', 'Robin', 'Ted', 'Scarlett', 'Kat'], "Result": ['Pass', 'Fail', 'Fail', 'Pass', 'Pass'] } )Reshape the data using the map() function and just set ‘Pass’ to 1 and ‘Fail’ to 0 −dataFrame['Result'] = dataFrame['Result'].map({'Pass': 1, 'Fail': 0, }) ExampleFollowing is the code − import pandas as pd # Create DataFrame dataFrame ... Read More