Scientific Mode Tutorial
In this tutorial, you operate in Scientific Mode and use Matplotlib and NumPy packages to run and debug a Python code with data visualization.
Before you start, ensure the following is installed:
Creating a Scientific project
To create a PyCharm project with Scientific mode settings predefined:
Open the New Project wizard (File | New | Project ).
Choose Scientific project type.
In the project settings dialog window, specify a project name, ensure the Conda is selected as the new environment, and alter the default data folder (if needed), then click Create.
main.pyfile and add the following code sample:
import numpy as np import matplotlib.pyplot as plt N = 50 x = np.random.rand(N) y = np.random.rand(N) colors = np.random.rand(N) area = np.pi * (15 * np.random.rand(N))**2 # 0 to 15 point radii plt.scatter(x, y, s=area, c=colors, alpha=0.5) plt.show() X = np.linspace(-np.pi, np.pi, 256,endpoint=True) C,S = np.cos(X), np.sin(X) plt.plot(X, C, color="blue", linewidth=2.5, linestyle="-") plt.plot(X, S, color="red", linewidth=2.5, linestyle="-") plt.xlim(X.min()*1.1, X.max()*1.1) plt.xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi], [r'$-\pi$', r'$-\pi/2$', r'$0$', r'$+\pi/2$', r'$+\pi$']) plt.ylim(C.min()*1.1,C.max()*1.1) plt.yticks([-1, 0, +1], [r'$-1$', r'$0$', r'$+1$']) plt.show()
Process warnings shown for the
matplotlibimports and enable the packages in the project.
Run your scientific project (Shift+F10). The code is executed and shows two graphs in the SciView. Clicking the preview thumbnail displays the respective graph:
You can modify the project code to plot only one graph at a time. In the scientific mode, you can execute fragments of your code by creating code cells.
To execute code cells:
main.pyfile by adding the "#%%" lines.
In the left gutter, click the icon (Ctrl+Enter) on line with the scatter plot cell mark. Only the scatter graph will be built.
Now click the icon or press Ctrl+Enter on the line with the y versus x plot cell mark. The corresponding graph should appear.
Let's put a breakpoint at the line:
This line appears twice in our example code, and so there will be two breakpoints.
Right-click the editor background and on the context menu choose Debug 'sample'.
The line with the first breakpoint is blue highlighted. It means that the debugger has stopped at the line with the breakpoint, but has not yet executed it. If we execute this line (for example, by clicking the button on the stepping toolbar of the Debug tool window), we'll see the graph:
Next, look at the Variables tab of the Debug tool window. If you click the
View as Array link nearby the
area array, the Data tab in the SciView window will open:
When you process excessive amount of data, you might experience degradation of debugging performance if the debugger loads variable's values synchronously or asynchronously. It is recommended to switch to the On demand mode by selecting the corresponding loading policy. See Managing Variables Loading Policy for more information.
Mind the only row of figures in the Data tab in the SciView - it's explained by the fact that the
area array is one-dimensional.
Running in console
Right-click the editor background and choose the Run File in Console command:
This command corresponds to running a run/debug configuration for the
main.py file with the Run with Python console checkbox selected:
When this command is run, the
>>> prompt appears after the output in the Run tool window, and you can execute your own commands.
So, what has been done with the help of PyCharm?
main.pywas created and opened for editing.
The source code has been entered (note the powerful PyCharm's code completion!)
The source code has been run and debugged.
Finally, we ran the file in console.