PyCharm 2021.2 Help

Step 1. Create and run your first Python project

Demonstration of the basic workflow

Before you start

Ensure that the following prerequisites are met:

  • You are working with PyCharm Community or Professional

  • You have installed Python itself. If you're using macOS or Linux, your computer already has Python installed. You can get Python from python.org.

To get started with PyCharm, let’s write a Python script.

Create a Python project

  1. If you’re on the Welcome screen, click New Project. If you’ve already got any project open, choose File | New Project from the main menu.

  2. Although you can create projects of various types in PyCharm, in this tutorial let's create a simple Pure Python project. This template will create an empty project.

    Create a new project
  3. Choose the project location. Click the Browse button button next to the Location field and specify the directory for your project.

  4. Also, deselect the Create a main.py welcome script checkbox because you will create a new Python file for this tutorial.

  5. Python best practice is to create a virtualenv for each project. In most cases, PyCharm create a new virtual environment automatically and you don't need to configure anything. Still, you can preview and modify the venv options. Expand the Python Interpreter: New Virtualenv Environment node and select a tool used to create a new virtual environment. Let's choose Virtualenv tool, and specify the location of the environment and the base Python interpreter used for the new virtual environment.

    When configuring the base interpreter, you need to specify the path to the Python executable. If PyCharm detects no Python on your machine, it provides two options: to download the latest Python versions from python.org or to specify a path to the Python executable (in case of non-standard installation).

    Downloading Python when creating a new project

    Refer to Configure a Python interpreter for more details.

    Now click the Create button at the bottom of the New Project dialog.

If you’ve already got a project open, after clicking Create PyCharm will ask you whether to open a new project in the current window or in a new one. Choose Open in current window- this will close the current project, but you'll be able to reopen it later. See the page Open, reopen, and close projects for details.

Create a Python file

  1. In the Project tool window, select the project root (typically, it is the root node in the project tree), right-click it, and select File | New ....

    Create a Python file
  2. Select the option Python File from the context menu, and then type the new filename.

    Creating a new Python file

    PyCharm creates a new Python file and opens it for editing.

    New Python file

Edit Python code

Let's start editing the Python file you've just created.

  1. Start with declaring a class. Immediately as you start typing, PyCharm suggests how to complete your line:

    Create class completion

    Choose the keyword class and type the class name, Car.

  2. PyCharm informs you about the missing colon, then expected indentation:

    Create class analysis

    Note that PyCharm analyses your code on-the-fly, the results are immediately shown in the inspection indicator in the upper-right corner of the editor. This inspection indication works like a traffic light: when it is green, everything is OK, and you can go on with your code; a yellow light means some minor problems that however will not affect compilation; but when the light is red, it means that you have some serious errors. Click it to preview the details in the Problems tool window.

    View code problems
  3. Let's continue creating the function __init__: when you just type the opening brace, PyCharm creates the entire code construct (mandatory parameter self, closing brace and colon), and provides proper indentation.

    Create class
  4. If you notice any inspection warnings as you're editing your code, click the bulb symbol to preview the list of possible fixes and recommended actions:

    Intention actions
  5. Let's copy and paste the entire code sample. Click the copy button in the upper-right corner of the code block here in the help page, then paste it into the PyCharm editor replacing the content of the Car.py file:

    class Car: def __init__(self, speed=0): self.speed = speed self.odometer = 0 self.time = 0 def say_state(self): print("I'm going {} kph!".format(self.speed)) def accelerate(self): self.speed += 5 def brake(self): if self.speed < 5: self.speed = 0 else: self.speed -= 5 def step(self): self.odometer += self.speed self.time += 1 def average_speed(self): if self.time != 0: return self.odometer / self.time else: pass if __name__ == '__main__': my_car = Car() print("I'm a car!") while True: action = input("What should I do? [A]ccelerate, [B]rake, " "show [O]dometer, or show average [S]peed?").upper() if action not in "ABOS" or len(action) != 1: print("I don't know how to do that") continue if action == 'A': my_car.accelerate() elif action == 'B': my_car.brake() elif action == 'O': print("The car has driven {} kilometers".format(my_car.odometer)) elif action == 'S': print("The car's average speed was {} kph".format(my_car.average_speed())) my_car.step() my_car.say_state()

At this point, you're ready to run your first Python application in PyCharm.

Run your application

Use either of the following ways to run your code:

  • Right-click the editor and select Run 'Car' from the context menu .

  • Press Ctrl+Shift+F10.

  • Since this Python script contains a main function, you can click an icon Run icon in the left gutter in the gutter. If you hover your mouse pointer over it, the available commands show up:

    Running a script

    If you click this icon, you'll see the popup menu of the available commands. Choose Run 'Car':

    Run command

PyCharm executes your code in the Run tool window.

Run Tool window

Here you can enter the expected values and preview the script output.

Note that PyCharm has created a temporary run/debug configuration for the Car file.

Temporary run/debug configuration

The run/debug configuration defines the way PyCharm executes your code. You can save it to make it a permanent configuration or modify its parameters. See Run/debug configurations for more details about running Python code.

Summary

Congratulations on completing your first script in PyCharm! Let's repeat what you've done with the help of PyCharm:

  • Created a project.

  • Created a file in the project.

  • Created the source code.

  • Ran this source code.

In the next step, learn how to debug your programs in PyCharm.

Last modified: 31 August 2021