Run and debug Jupyter notebook code cells
Use the following smart shortcuts to quickly run the code cells:
CtrlEnter: Runs the current cell.
ShiftEnter: Runs the current cell and selects the cell below it.
When executing one cell at a time, mind code dependencies. If a cell relies on some code in another cell, that cell should be executed first.
When the execution is done, the cell remains in the edit mode, so that you can modify it, if needed, and keep experimenting.
In the lower left corner of the cell, you can find the information about the last cell execution. It includes the execution duration, as well as the date and time when the execution finished.
In case of any errors, expand the Traceback node to view the complete error message.
To execute all code cells in your notebook, click
on the notebook toolbar.
warning
This functionality is available only for local Jupyter server kernels.
When you execute your notebook, you can preview variables in the Jupyter Variables tool window .
You can click the link to the right of the variable to preview its values in the tabular form.
Go to and make sure that the Show inline values in editor checkbox is enabled.
Run the notebook cell. The values of variables are shown next to their usages:
Values of specific types, for example, pandas DataFrames and numpy arrays, can't be rendered inline. To view them in the tabular form, hover the mouse pointer over the value and click the down arrow:
When data frames are built, they are displayed in the tabular form. To open a data frame in a separate editor tab, click
in the upper-right corner of the output cell.
Right-click the column name to open the context menu:
To copy the column name to the clipboard, select Copy Column Name.
To hide a column, select Hide Column. Hide Other Columns will hide all columns except the selected one.
To display hidden columns, click Columns List CtrlF12. The hidden columns are shown strikethrough. Select a column and press Space to toggle its visibility. To search through the column list, start typing a column name in the Columns List window.
To sort the table data based on the column values, you can either click the column name or select Ascending or Descending from the context menu.
To assign a language to a column, use Set Highlighting Language. For more information, see Inject a language for a column.
You can browse table data in several modes: Table, Tree, Text, and Transpose. To switch between these modes, click
in the upper-right corner of the output cell and select the mode that you need.
For more information about viewing modes, see View data.
To configure the way DataSpell displays data in the Text mode, use the Data Extractors drop-down:
For more information, see Data extractors.
To view reference information for any element of a particular code cell, place the caret within the target code cell and type
? <type/variable/argument>. (in this example, you will preview documentation forplt.scatter). Note that a code element should be accessible within the code cell.Execute the cell. The Introspection tab opens in the Jupyter tool window.
Preview reference documentation in the Introspection tab.
Set the breakpoints in the selected cell and press Alt + Shift + Enter for Windows or ⌥⇧↩ for macOS. Alternatively, you can right-click the cell and select from the context menu.
The Jupyter Notebook Debugger tool window opens.
Use the stepping toolbar to choose on which line you want to stop next and switch to the Debugger tab to preview the variable values:
Debugging is performed within a single code cell. However, if your code cell calls a function from any cell that has been already debugged, you can step into it. The related breakpoints will also work. Note that the cell with the function must be debugged not just executed.
warning
The debugger may skip a cell if you change its source code or execute it not under the debugger. Also, you can see a warning message when trying to modify the cell code during the debugging session.
Similarly, you can step into a function called from a Python file that is located in the same project.
Proceed with the debugging steps to complete the execution of the cell.
Item | Tooltip and Shortcut | Description |
|---|---|---|
Action available on the Debugger toolbar. | ||
| Step Over F8 | Click this button to execute the program until the next line in the current method or file, skipping the methods referenced at the current execution point (if any). If the current line is the last one in the method, execution steps to the line executed right after this method. |
| Step Into F7 | Click this button to have the debugger step into the method called at the current execution point. |
| Step Out ShiftF8 | Click this button to have the debugger step out of the current method, to the line executed right after it. |
Additional stepping actions available by clicking | ||
| Force Step Over | Steps over the current line of code and takes you to the next line even if the highlighted line has method calls in it. If there are breakpoints in the called methods, they are ignored. |
| Smart Step Into | Smart step into is helpful when there are several method calls on a line, and you want to be specific about which method to enter. This feature allows you to select the method call you are interested in. |
| Run to Cursor AltF9 | Click this button to resume program execution and pause until the execution point reaches the line at the current cursor location in the editor. No breakpoint is required. Actually, there is a temporary breakpoint set for the current line at the caret, which is removed once program execution is paused. Thus, if the caret is positioned at the line which has already been executed, the program will be just resumed for further execution, because there is no way to roll back to previous breakpoints. This action is especially useful when you have stepped deep into the methods sequence and need to step out of several methods at once. If there are breakpoints set for the lines that should be executed before bringing you to the specified line, the debugger will pause at the first encountered breakpoint. |
| Force Run to Cursor | Continues the execution until the position of the caret is reached. All breakpoints on the way are ignored. |
on the Debugger toolbar.
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