Python Articles - Page 438 of 1048

To count the NaN occurrences in a column, use the isna(). Use the sum() to add the values and find the count.At first, let us import the required libraries with their respective aliases −import pandas as pd import numpy as npCreate a DataFrame. We have set the NaN values using the Numpy np.inf in “Units_Sold” column −dataFrame = pd.DataFrame({"Car": ['BMW', 'Lexus', 'Tesla', 'Mustang', 'Mercedes', 'Jaguar'], "Cubic_Capacity": [2000, 1800, 1500, 2500, 2200, 3000], "Reg_Price": [7000, 1500, 5000, 8000, 9000, 6000], "Units_Sold": [ 100, np.NaN, 150, np.NaN, 200, np.NaN] })Count NaN values from column "Units_Sold" −dataFrame["Units_Sold"].isna().sum() ExampleFollowing is the code −import pandas ... Read More

To merge Pandas DataFrame, use the merge() function. The one-to-one relation is implemented on both the DataFrames by setting under the “validate” parameter of the merge() function i.e. −validate = “one-to-one” or validate = “1:1”The one-to-many relation checks if merge keys are unique in both left and right dataset.At first, let us create our 1st DataFrame −dataFrame1 = pd.DataFrame(    {       "Car": ['BMW', 'Lexus', 'Audi', 'Mustang', 'Bentley', 'Jaguar'], "Units": [100, 150, 110, 80, 110, 90] } )Now, let us create our 2nd DataFrame −dataFrame2 = pd.DataFrame(    {       "Car": ['BMW', 'Lexus', ... Read More

Use the “method” parameter of the fillna() method. For forward fill, use the value ‘ffill’ as shown below −fillna(method='ffill')Let’s say the following is our CSV file opened in Microsoft Excel with some NaN values −At first, import the required library −import pandas as pd Load data from a CSV file into a Pandas DataFrame −dataFrame = pd.read_csv("C:\Users\amit_\Desktop\SalesData.csv")ExampleFollowing is the complete code −import pandas as pd # Load data from a CSV file into a Pandas DataFrame dataFrame = pd.read_csv("C:\Users\amit_\Desktop\SalesData.csv") print("DataFrame...", dataFrame) # propagate non null values forward res = dataFrame.fillna(method='ffill') print("DataFrame after forward fill...", res)OutputThis will produce the ... Read More

Downward pattern displayed by Time Series Analysis is what we call Downtrend. Let’s say the following is our dataset i.e. SalesRecords2.csvAt first, import the required libraries −import pandas as pd import matplotlib.pyplot as pltLoad data from a CSV file into a Pandas DataFrame −dataFrame = pd.read_csv("C:\Users\amit_\Desktop\SalesRecords2.csv") Casting column to datetime object −dataFrame['Sold_On'] = pd.to_datetime(dataFrame['Sold_On'])Create the plot for downtrend −dataFrame.plot() ExampleFollowing is the code −import pandas as pd import matplotlib.pyplot as plt # Load data from a CSV file into a Pandas DataFrame dataFrame = pd.read_csv("C:\Users\amit_\Desktop\SalesRecords2.csv") print("Reading the CSV file...", dataFrame) # casting column to datetime object dataFrame['Sold_On'] = ... Read More

Upward pattern displayed by Time Series Analysis is what we call Uptrend. Let’s say the following is our dataset i.e. SalesRecords.csvAt first, import the required libraries −import pandas as pd import matplotlib.pyplot as pltLoad data from a CSV file into a Pandas DataFrame −dataFrame = pd.read_csv("C:\Users\amit_\Desktop\SalesRecords.csv")Casting column to datetime object −dataFrame['Date_of_Purchase'] = pd.to_datetime(dataFrame['Date_of_Purchase'])Create the plot for uptrend −dataFrame.plot()ExampleFollowing is the code −import pandas as pd import matplotlib.pyplot as plt # Load data from a CSV file into a Pandas DataFrame dataFrame = pd.read_csv("C:\Users\amit_\Desktop\SalesRecords.csv") print("Reading the CSV file...", dataFrame) # casting column to datetime object dataFrame['Date_of_Purchase'] = pd.to_datetime(dataFrame['Date_of_Purchase']) ... Read More

Use the ValDrop() method of pdpipe library to remove a row from an already create Pandas DataFrame. At first, import the required pdpipe and pandas libraries with their respective aliases −import pdpipe as pdp import pandas as pdLet us create a DataFrame. Here, we have two columns −dataFrame = pd.DataFrame(    {       "Car": ['BMW', 'Lexus', 'Audi', 'Mustang', 'Bentley', 'Jaguar'], "Units": [100, 150, 110, 80, 110, 90] } )Now, remove a row using valdDrop() method −dataFrame = pdp.ValDrop(['Jaguar'], 'Car').apply(dataFrame) ExampleFollowing is the complete code −import pdpipe as pdp import pandas as pd # function ... Read More

We will plot a line grapg for Pandas DataFrame using the plot(). At first, import the required libraries −import pandas as pd import matplotlib.pyplot as pltCreate a DataFrame −dataFrame = pd.DataFrame(    {       "Car": ['BMW', 'Lexus', 'Audi', 'Mustang', 'Bentley', 'Jaguar'], "Reg_Price": [2000, 2500, 2800, 3000, 3200, 3500], "Units": [100, 120, 150, 170, 180, 200] } )Plot a line graph with both the columns −plt.plot(dataFrame["Reg_Price"], dataFrame["Units"])ExampleFollowing is the code −import pandas as pd import matplotlib.pyplot as plt # creating a DataFrame with 2 columns dataFrame = pd.DataFrame(    {       "Car": ['BMW', ... Read More

To plot a Pie Chart, use the plot.pie(). The pie plot is a proportional representation of the numerical data in a column.Import the required libraries −import pandas as pd import matplotlib.pyplot as pltCreate a DataFrame −dataFrame = pd.DataFrame({ "Car": ['BMW', 'Lexus', 'Tesla', 'Mustang', 'Mercedes', 'Jaguar'], "Reg_Price": [7000, 1500, 5000, 8000, 9000, 6000] })Plot a Pie Chart for Registration Price column with label Car column −plt.pie(dataFrame["Reg_Price"], labels = dataFrame["Car"]) ExampleFollowing is the code −import pandas as pd import matplotlib.pyplot as plt # creating dataframe dataFrame = pd.DataFrame({    "Car": ['BMW', 'Lexus', 'Tesla', 'Mustang', 'Mercedes', 'Jaguar'], "Reg_Price": [7000, ... Read More

Histogram is a representation of the distribution of data. To plot a Histogram, use the hist() method. At first, import both the libraries −import pandas as pd import matplotlib.pyplot as pltCreate a DataFrame with 2 columns −dataFrame = pd.DataFrame({    "Car": ['BMW', 'Lexus', 'Tesla', 'Mustang', 'Mercedes', 'Jaguar'], "Reg_Price": [7000, 1500, 5000, 8000, 9000, 6000] })Plot a Histogram for Registration Price column −plt.hist(dataFrame["Reg_Price"])ExampleFollowing is the code −import pandas as pd import matplotlib.pyplot as plt # creating dataframe dataFrame = pd.DataFrame({    "Car": ['BMW', 'Lexus', 'Tesla', 'Mustang', 'Mercedes', 'Jaguar'], "Reg_Price": [7000, 1500, 5000, 8000, 9000, 6000] }) # plot a ... Read More

We can plot Line Graph, Pie Chart, Histogram, etc. with a Pandas DataFrame using Matplotlib. For this, we need to import Pandas and Matplotlib libraries −import pandas as pd import matplotlib.pyplot as pltLet us begin plotting −Line GraphExampleFollowing is the code −import pandas as pd import matplotlib.pyplot as plt # creating a DataFrame with 2 columns dataFrame = pd.DataFrame(    {       "Car": ['BMW', 'Lexus', 'Audi', 'Mustang', 'Bentley', 'Jaguar'],          "Reg_Price": [2000, 2500, 2800, 3000, 3200, 3500], "Units": [100, 120, 150, 170, 180, 200] ... Read More