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To eject the USB device from the system, we first need to get the USB device using PowerShell. WMI class Win32_Volume will help us to find the USB device.We know that all removal devices using the DriveType '2'. So we will filter out the USB device among the listed devices.PS C:\> $usbdev = gwmi win32_volume | where{$_.DriveType -eq '2'}The below commands will helpful to unallocated the USB from the system.PS C:\> $usbdev.DriveLetter = $null PS C:\> $usbdev.Put()OutputPath : \localhost\root\cimv2:Win32_Volume.DeviceID="\\?\Volume{6e4d6f1e-a8c2-11eb-9493-005056c00008}\" RelativePath : Win32_Volume.DeviceID="\\?\Volume{6e4d6f1e-a8c2-11eb-9493-005056c00008}\" Server : localhost NamespacePath : root\cimv2 ClassName : Win32_Volume IsClass : False IsInstance : True IsSingleton : FalseAnd ... Read More
To retrieve the USB-connected devices using Powershell, we need to retrieve all the drives using the WMI object or CIM Instance and need to filter the win32_diskdrive class with the USB as shown below.So basically, USB devices and other removable devices have the drivetype '2'. You can search with the InterfaceType or the DriveType.WMI commands, gwmi win32_diskdrive | where{$_.Interfacetype -eq "USB"}Alternatively, With the CIM commands, Get-CimInstance -ClassName Win32_DiskDrive | where{$_.InterfaceType -eq 'USB'}orGet-CimInstance -ClassName Win32_LogicalDisk | where{$_.DriveType -eq '2'}If there is no USB device connected to the system, there will be no output. To retrieve the USB disk on the remote ... Read More
RSA is an asymmetric cryptography algorithm which works on two keys-public key and private key.AlgorithmsBegin 1. Choose two prime numbers p and q. 2. Compute n = p*q. 3. Calculate phi = (p-1) * (q-1). 4. Choose an integer e such that 1 < e < phi(n) and gcd(e, phi(n)) = 1; i.e., e and phi(n) are coprime. 5. Calculate d as d ≡ e−1 (mod phi(n)); here, d is the modular multiplicative inverse of e modulo phi(n). 6. For encryption, c = me mod n, where m = original message. 7. For ... Read More
To show multiple colorbars in matplotlib, we can take the following steps−Set the figure size and adjust the padding between and around the subplots.Create a figure and a set of subplots.Initialize a variable N for the number of sample data.Create random data1 using numpy.Display data as an image, i.e., on a 2D regular raster, with data1.Add a colorbar to a plot.Repeat steps 4, 5, and 6, with different datasets and axes.To display the figure, use show() method.Examplefrom matplotlib import pyplot as plt import numpy as np plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True fig, (ax1, ax2) = plt.subplots(nrows=2, ncols=1) N ... Read More
To plot a circle with an edgecolor in matplotlib, we can take the following Steps −Create a new figure or activate an existing figure using figure() method.Add a subplot method to the current axis.Create a circle instance using Circle() class with an edgecolor and linewidth of the edge.Add a circle path on the plot.To place the text in the circle, we can use text() method.Scale the X and Y axes using xlim() and ylim() methods.To display the figure, use show() method.Exampleimport matplotlib from matplotlib import pyplot as plt, patches plt.rcParams["figure.figsize"] = [7.00, 3.50] plt.rcParams["figure.autolayout"] = True fig = plt.figure() ax ... Read More
To plot a bar graph from a Pandas series in matplotlib, we can take the following Steps −Make a dictionary of different keys, between the range 1 to 10.Make a dataframe using Pandas data frame.Create a bar plot using plot() method with kind="bar".To display the figure, use show() method.Exampleimport pandas as pd from matplotlib import pyplot as plt plt.rcParams["figure.figsize"] = [7.00, 3.50] plt.rcParams["figure.autolayout"] = True d = {'y=1/x': [1 / i for i in range(1, 10)], 'y=x': [i for i in range(1, 10)], 'y=x^2': [i * i for i in range(1, 10)], 'y=x^3': [i * i * ... Read More
To change the axis tick font in matplotlib when rendering using LaTeX, we can take the following Steps −Create x and y data points using numpy.Using subplot() method, add a subplot to the current figure.Set x and y ticks with data points x and y using set_xticks and set_yticks methods, respectively.Plot x and y using plot() method with color=red.To set bold font weight, we can use LaTeX representation.To display the figure, use show() method.Exampleimport numpy as np import matplotlib.pyplot as plt plt.rcParams["figure.figsize"] = [7.00, 3.50] plt.rcParams["figure.autolayout"] = True x = np.array([1, 2, 3, 4]) y = np.exp(x) ax1 = ... Read More
To show a plot in Flask, we can take the following steps−Make a small application.To run Flask application, go to the current directory.$ export FLASK_APP=file.py$ flask runOpen the browser, hit url:http://127.0.0.1:5000/print-plot/To plot the figure, we can create data points for x and y using random.Plot data points, x and y, on the created axis.Write a figure into png figure format.Retrieve the entire contents of the BytesIO object.Exampleimport io from flask import Response from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas from matplotlib.figure import Figure from flask import Flask import numpy as np plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True app = Flask(__name__) ... Read More
To rotate tick labels in a subplot, we can use set_xticklabels() or set_yticklabels() with rotation argument in the method.Create a list of numbers (x) that can be used to tick the axes.Get the axis using subplot() that helps to add a subplot to the current figure.Set ticks on the X and Y axes using set_xticks and set_yticks methods, respectively, and the list x (from step 1).Set tick labels with label lists (["one", "two", "three", "four"]) and rotation=45 using set_xticklabels() and set_yticklabels().To add space between axes and tick labels, we can use tick_params() method with pad argument that helps to add ... Read More
To write unit test cases against a code, we can consider a plot that takes an array as x points and plot it as y=x^2. While testing, we would extract y_data for x data points.−StepsCreate a method, i.e., plot_sqr_curve(x) to plot x and x^2 using plot() method and return the plot.To test, use unittest.TestCase.Write test_curve_sqr_plot() method that includes the following statements.Create data points for x to plot the curve.Using the above x data points, create y data points.Using x and y data points, plot the curve.Using pt (from step 5), extract x and y data.Check whether the given expression is ... Read More