Stack and unstack functions are used to reshape a DateFrame in the pandas library to extract more information in different ways.StackPandas stack is used for stacking the levels from column to index. It returns a new DataFrame or Series with a multi-level index. The stack method has 2 parameters which are level and dropna.The level parameter is used to stack from the column axis onto the index axis, the default value is 1, and we can give string, list, and integer. As well as dropna is used to remove rows in the resultant DataFrame/Series with missing values. By default it ... Read More

Using pandas.Series.to_string() we can convert a single series into a string.Let’s take some examples and see how it’s gonna work.ExampleCreate a pandas Series using string dtype data, then convert it to a string.# create a series ds = pd.Series(["a", "b", "c", "a"], dtype="string") print(ds) # display series s = ds.to_string() # convert to string print() print(repr(s)) display converted outputExplanationThe variable ds holds a pandas Series with all string data by defining dtype as a string. Then convert the series into a string by using the pandas.Series.to_string method, here we define it as ds.to_string(). Finally, the converted string is assigned to ... Read More

Pandas can not only include text data as an object, it also includes any other data that pandas don’t understand. This means, if you say when a column is an Object dtype, and it doesn’t mean all the values in that column will be a string or text data. In fact, they may be numbers, or a mixture of string, integers, and floats dtype. So with this incompatibility, we can not do any string operations on that column directly.Due to this problem, string dtype is introduced from the pandas 1.0 version, but we need to define it explicitly.See some examples ... Read More

There are two ways to store textual data in python pandas (for version 1.0.0.to Latest version 1.2.4). On this note, we can say pandas textual data have two data types which are object and StringDtype.In the older version of pandas (1.0), only object dtype is available, in a newer version of pandas it is recommended to use StringDtype to store all textual data. To overcome some disadvantages of using objects dtype, this StringDtype is introduced in the pandas 1.0 version. Still, we can use both object and StringDtype for text data.Let’s take an example, in that create a DataFrame using ... Read More

JSON stands for JavaScript Object Notation, it stores the text data in the form of key/value pairs and this can be a human-readable data format. These JSON files are often used to exchange data on the web. The JSON object is represented in between curly brackets ({}). Each key/value pair of JSON is separated by a comma sign.JSON data looks very similar to a python dictionary, but JSON is a data format whereas a dictionary is a data structure. To read JSON files into pandas DataFrame we have the read_json method in the pandas library. Below examples give you the ... Read More

DataFrame is a two-dimensional pandas data structure, which is used to represent the tabular data in the rows and columns format.We can create a pandas DataFrame object by using the python list of dictionaries. If we use a dictionary as data to the DataFrame function then we no need to specify the column names explicitly.Here we will create a DataFrame using a list of dictionaries, in the below example.Example# Creating list of dictionaries li = [{'i': 10, 'j': 20, 'k': 30}, {'i': 8, 'j': 40, 'k': 60}, {'i': 6, 'j': 60, 'k': 90}] # creating dataframe df = pd.DataFrame(l, ... Read More

Pandas series has a method for calculating absolute values of series elements. That function can also be used for calculating the absolute values of a series with complex numbers.The abs() method in the pandas series will return a new series, which is having calculated absolute values of a series with complex numbers.The absolute value of a complex number is $\sqrt{a^{2}+b^{2}}$ whereas a is the real value and b is the imaginary value of a complex number.Example# importing pandas packages import pandas as pd #creating a series with null data s_obj = pd.Series([2.5 + 3j, -1 - 3.5j, 9 ... Read More

The abs function of the pandas series will return a series with absolute numeric values of each element. This abs function will calculate the absolute values for each element in a series.This function only works for a series objects if it has numerical elements only. it doesn’t work for any missing elements (NaN values), and it can be used to calculate absolute values for complex numbers.Exampleimport pandas as pd # create a series s = pd.Series([-3.43, -6, 21, 6, 1.4]) print(s, end='') # calculate absolute values result = s.abs() #print the result print(result)ExplanationWe have a simple ... Read More

The head() method in the pandas series is used to retrieve the topmost rows from a series object. By default, it will display 5 rows of series data, and we can customize the number of rows other than 5 rows.This method takes an integer value as a parameter to return a series with those many rows, suppose if you give integer n as a parameter to the head method like head(n) then it will return a pandas series with n number of elements. And those elements are the first n number of elements of our pandas series object.Example# importing required ... Read More

Pandas series is a one-dimensional ndarray type object which stores elements with labels, those labels are used to addressing the elements present in the pandas Series.The labels are represented with integers, string, DateTime, and more. Here we will see how to access the series elements if the indexes are labeled with DateTime values.Exampleimport pandas as pd # creating dates date = pd.date_range("2021-01-01", periods=5, freq="D") # creating pandas Series with date index series = pd.Series(range(10, len(date)+10), index=date) print(series) print('') # get elements print(series['2021-01-01'])ExplanationThe variable date is storing the list of dates with length 5, the starting date ... Read More