1. Microsoft Visual Studio 2019 Python
2. Visual Studio For Mac Python

Visual Studio is available for Windows and Mac; however, Python support is available only on Visual Studio for Windows. There are three editions of Visual Studio on Windows: Community, Professional, and Enterprise. See Compare Visual Studio IDEs to learn about which features are supported in each edition. Popular productivity features. Start from an existing Python file. Open the folder or your.py file in Visual Studio Code. Run Device Simulator Express: Open Simulator from the command palette or icon in the editor toolbar. Select the device you want to use. Run your code on the simulator. Run Run Simulator from the command palette or use the Play button on the.

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Linting highlights syntactical and stylistic problems in your Python source code, which oftentimes helps you identify and correct subtle programming errors or unconventional coding practices that can lead to errors. For example, linting detects use of an uninitialized or undefined variable, calls to undefined functions, missing parentheses, and even more subtle issues such as attempting to redefine built-in types or functions. Linting is thus distinct from Formatting because linting analyzes how the code runs and detects errors whereas formatting only restructures how code appears.

By default, linting for Python is enabled in Visual Studio Code using Pylint, and you can enable other linters of your choice. You can easily enable and disable all linting by using the Python: Enable Linting command.

Enable linters

To enable linters other than the default PyLint, open the Command Palette (⇧⌘P (Windows, Linux Ctrl+Shift+P)) and select the Python: Select Linter command. This command adds 'python.linting.<linter>Enabled': true to your settings, where <linter> is the name of the chosen linter. See Specific linters for details.

Enabling a linter prompts you to install the required packages in your selected environment for the chosen linter.

Note: If you're using a global environment and VS Code is not running elevated, linter installation may fail. In that case, either run VS Code elevated, or manually run the Python package manager to install the linter at an elevated command prompt for the same environment: for example sudo pip3 install pylint (macOS/Linux) or pip install pylint (Windows, at an elevated prompt)

Disable linting

You can disable all Python linting with the Python: Enable Linting command, which shows a dropdown with the current linting state and options to turn Python linting on or off.

Run linting

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• Linting runs automatically when you save a file.
• Open the Command Palette (⇧⌘P (Windows, Linux Ctrl+Shift+P)), then enter and select Python: Run Linting.

Issues are shown in the Problems panel and as underlines in the code editor. Hovering over an underlined issue displays the details:

General linting settings

The remainder of this article describes settings for linting in general as well as specific linters. You can add any of the settings to your user settings.json file (opened with the File > Preferences > Settings command ⌘, (Windows, Linux Ctrl+,)). Refer to User and Workspace settings to find out more about working with settings in VS Code generally.

To change the linting behavior across all enabled linters, modify the following settings:

You can easily change python.linting.enabled by using the Python: Enable Linting command.

When enabling lintOnSave, you might also want to enable the generic files.autoSave option (see Save / Auto Save). The combination provides frequent linting feedback in your code as you type.

Specific linters

The following table provides a summary of available Python linters and their basic settings. Only Pylint is enabled by default. For descriptions of individual settings, see the Linter settings reference.

To select a different linter, use the Python: Select Linter command. You can also edit your settings manually to enable multiple linters. Note, however, that using the Select Linter command overwrites those edits.

Custom arguments are specified in the appropriate arguments setting for each linter. Each top-level element of an argument string that's separated by a space on the command line must be a separate item in the args list. For example:

Note that if a top-level element is a single value, as delineated by quotation marks or braces, it still appears as a single item in the list even if the value itself contains spaces.

A custom path is generally unnecessary as the Python extension resolves the path to the linter based on the Python interpreter being used (see Environments). To use a different version of a linter, specify its path in the appropriate custom path setting. For example, if your selected interpreter is a virtual environment but you want to use a linter that's installed in a global environment, then set the appropriate path setting to point to the global environment's linter.

The sections that follow provide additional details for those individual linters linked in the table. In general, custom rules must be specified in a separate file as required by the linter you're using.

Pylint

Pylint messages fall into the categories in the following table with the indicated mapping to VS Code categories. You can change the setting to change the mapping.

Default Pylint rules

Python in Visual Studio code is configured by default to use a set of linting rules that are friendly to the largest number of Python developers:

• Enable all Error (E) and Fatal (F) messages.
• Disable all Convention (C) and Refactor (R) messages.
• Disable all Warning (W) messages except the following:
  • unreachable (W0101): Unreachable code
  • duplicate-key (W0109): Duplicate key %r in dictionary
  • unnecessary-semicolon (W0301): Unnecessary semicolon
  • global-variable-not-assigned (W0602): Using global for %r but no assignment is done
  • unused-variable (W0612): Unused variable %r
  • binary-op-exception (W0711): Exception to catch is the result of a binary '%s' operation
  • bad-format-string (W1302): Invalid format string
  • anomalous-backslash-in-string (W1401): Anomalous backslash in string
  • bad-open-mode (W1501): '%s' is not a valid mode for open

These rules are applied through the following default arguments passed to Pylint:

These arguments are passed whenever the python.linting.pylintUseMinimalCheckers is set to true (the default). If you specify a value in pylintArgs or use a Pylint configuration file (see the next section), then pylintUseMinimalCheckers is implicitly set to false.

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For the complete list of Pylint messages, see readable-pylint-messages (GitHub).

Command-line arguments and configuration files

See Pylint command-line arguments for general switches. Command-line arguments can be used to load Pylint plugins, such as the plugin for Django:

Options can also be specified in a pylintrc or .pylintrc options file in the workspace folder, as described on Pylint command line arguments.

To control which Pylint messages are shown, add the following contents to an options file:

You can easily generate an options file using Pylint itself:

For PowerShell you have to explictly specify a UTF-8 output encoding:

The generated file contains sections for all the Pylint options, along with documentation in the comments.

pydocstyle

Command-line arguments and configuration files

See pydocstyle Command Line Interface for general options. For example, to ignore error D400 (first line should end with a period), add the following line to your settings.json file:

A code prefix also instructs pydocstyle to ignore specific categories of errors. For example, to ignore all Docstring Content issues (D4XXX errors), add the following line to settings.json:

More details can be found in the pydocstyle documentation.

Options can also be read from a [pydocstyle] section of any of the following configuration files:

• setup.cfg
• tox.ini
• .pydocstyle
• .pydocstyle.ini
• .pydocstylerc
• .pydocstylerc.ini

For more information, see Configuration Files.

Message category mapping

The Python extension maps all pydocstyle errors to the Convention (C) category.

pycodestyle (pep8)

Command-line arguments and configuration files

See pycodestyle example usage and output for general switches. For example, to ignore error E303 (too many blank lines), add the following line to your settings.json file:

pycodestyle options are read from the [pycodestyle] section of a tox.ini or setup.cfg file located in any parent folder of the path(s) being processed. For details, see pycodestyle configuration.

Message category mapping

The Python extension maps pycodestyle message categories to VS Code categories through the following settings. If desired, change the setting to change the mapping.

Prospector

Command-line arguments and configuration files

See Prospector Command Line Usage for general options. For example, to set a strictness level of 'very high,' add the following line to your settings.json file:

It's common with Prospector to use profiles to configure how Prospector runs. By default, Prospector loads the profile from a .prospector.yaml file in the current folder.

Because Prospector calls other tools, such as Pylint, any configuration files for those tools override tool-specific settings in .prospector.yaml. For example, suppose you specify the following in .prospector.yaml:

If you also have a .pylintrc file that enables the too-many-arguments warning, you continue to see the warning from Pylint within VS Code.

Message category mapping

The Python extension maps all Prospector errors and warnings to the Error (E) category.

Flake8

Command-line arguments and configuration files

See Invoking Flake8 for general switches. For example, to ignore error E303 (too many blank lines), use the following setting:

By default, Flake8 ignores E121, E123, E126, E226, E24, and E704.

Flake8 user options are read from the C:Users<username>.flake8 (Windows) or ~/.config/flake8 (macOS/Linux) file.

At the project level, options are read from the [flake8] section of a tox.ini, setup.cfg, or .flake8 file.

For details, see Flake8 configuration.

Message category mapping

The Python extension maps flake8 message categories to VS Code categories through the following settings. If desired, change the setting to change the mapping.

mypy

Message category mapping

The Python extension maps mypy message categories to VS Code categories through the following settings. If desired, change the setting to change the mapping.

Troubleshooting linting

Microsoft Visual Studio 2019 Python

Next steps

Visual Studio For Mac Python

• Debugging - Learn to debug Python both locally and remotely.
• Testing - Configure test environments and discover, run, and debug tests.
• Basic Editing - Learn about the powerful VS Code editor.
• Code Navigation - Move quickly through your source code.