[WIP] Add Python Introduction, Python Basics (1-14 tasks)

L01/T01/main.py

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+if __name__ == "__main__":
+    # Write your solution here
+    pass

L01/T01/task-info.yaml

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+type: theory
+custom_name: About
+files:
+  - name: task.md
+    visible: false
+  - name: main.py
+    visible: true

L01/T01/task.md

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+# Welcome
+
+Welcome to the **Complete Python Developer Zero to Mastery** course.
+
+In this course, you will learn Python from the ground up, starting with the fundamentals and gradually moving on to more practical exercises and real working programs. Each section builds on the previous one, helping you develop both understanding and confidence as you progress.
+
+In the next two tasks, you will take your first steps in the development environment. We will explore the IDE interface in more detail and run your first Python program.
+
+#### Prerequisites
+
+You don't need to have any previous experience in Python or programming in general 
+to complete this course.
+
+**Click the "Next" button to navigate to the next task and good luck!**

L01/T02/main.py

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+if __name__ == "__main__":
+    # Write your solution here
+    pass

L01/T02/task-info.yaml

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+type: theory
+custom_name: Navigating Around
+files:
+  - name: task.md
+    visible: false
+  - name: main.py
+    visible: true
+  - name: images/edu_course_overview.png
+    visible: false
+    is_binary: true
+  - name: images/edu_course_overview_dark.png
+    visible: false
+    is_binary: true
+  - name: images/forward.svg
+    visible: false
+    is_binary: true
+  - name: images/back.svg
+    visible: false
+    is_binary: true
+  - name: images/reset.svg
+    visible: false
+    is_binary: true

L01/T02/task.md

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+## JetBrains Academy plugin overview
+
+This lesson will help you take your first steps with the [JetBrains Academy plugin](https://www.jetbrains.com/help/education/educational-products.html) and use it to learn Python.
+
+With the JetBrains Academy plugin, you can learn programming languages and tools by completing coding tasks and get instant feedback right inside the IDE.
+
+If you're already familiar with the interface, you can skip this lesson.
+
+### Working with courses
+When you open a course, you will see the main tool windows used for navigation: <b>Course View</b>, <b>Editor</b>, and <b>Task Description</b>. 
+
+<style>
+img {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}
+</style>
+<img src="images/edu_course_overview.png" class="center" width=800>
+
+In <b>Course View</b>, you can switch between lessons and tasks. In the <b>Editor</b>, you write code and complete the task. In <b>Task Description</b>, you can read the theory and the task instructions.
+
+### Task Description
+
+The **Task Description** window gives you all the information you need to complete a task: 
+
+- For theoretical tasks, the description provides learning and reading materials.
+- For programming assignments, it states the problem to be solved. 
+
+Use Task Description icons for the following actions:
+
+| Icon                               | Description                   |
+|------------------------------------|-------------------------------|
+|**Check**                           | <font size="-1">Check the correctness of your answer (for a quiz) or your code solution (for a programming task)</font>|   
+| **Run**                            | <font size="-1">Run your code (for a theoretical task)</font>|
+|![](images/back.svg)                | <font size="-1">Go to the previous task</font>       |    
+|![](images/forward.svg) &nbsp;<font size="-1">or</font> **Next** | <font size="-1">Go to the next task</font>| 
+|![](images/reset.svg)               | <font size="-1">Discard all the changes you’ve made in the task, and start over</font>|
+|<a>Peek Solution...</a>             | <font size="-1">Reveal the correct answer and show the <b>diff</b></font>|
+
+<style>
+img {
+  display: inline !important;
+}
+table, th, td {
+  border: 1px solid black;
+  border-collapse: collapse;
+}
+th, td {
+  padding: 5px;
+}
+table td:nth-child(1) {
+    text-align: center;
+}
+</style>

L01/T03/OurFirstPythonProgram.py

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+name = input("what is your name?\n")
+print("Hello " + name)
+

L01/T03/task-info.yaml

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+type: theory
+custom_name: Your First Python Program
+files:
+  - name: task.md
+    visible: false
+  - name: OurFirstPythonProgram.py
+    visible: true
+  - name: images/run.svg
+    visible: false
+    is_binary: true
+  - name: images/run_dark.svg
+    visible: false
+    is_binary: true
+  - name: images/hello_username.gif
+    visible: false
+    is_binary: true

L01/T03/task.md

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+### Understanding the Code
+
+```python
+name = input("what is your name?\n")  # Gets input from you
+print("Hello " + name)                 # Prints the greeting
+```
+
+- `input()` - Asks you to type something
+- The Run tool window (at bottom) is where you type and see output
+- `print()` - Shows messages on screen
+
+**Try It!**
+
+1. Click the **Run** button (![](images/run.svg)) at the top right
+2. Type your name when asked
+3. Press Enter
+4. See your personalized greeting!
+
+<img src="images/hello_username.gif" width="800">
+
+<style>
+img {
+  display: inline !important;
+}
+</style>

L01/T04/main.py

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+if __name__ == "__main__":
+    # Write your solution here
+    pass

L01/T04/task-info.yaml

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+type: theory
+custom_name: Before You Continue
+files:
+  - name: task.md
+    visible: false
+  - name: main.py
+    visible: true
+  - name: images/placeholder.png
+    visible: false
+    is_binary: true
+  - name: images/placeholder_dark.png
+    visible: false
+    is_binary: true

L01/T04/task.md

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+### Entering Multiple Answers
+
+In future tasks, you may see several input fields for your answers. The highlighted box in the image below shows where you need to enter them.
+
+<img src="images/placeholder.png" class="center" width=800>
+
+In such cases, the test checks all fields together. If you enter some correct answers but leave the others empty, the test will not pass. **Make sure to fill in all answer fields before running the test.**
+
+### Comments
+In Python, comments start with the hash character (`#`) followed by a single space and extend to the end of the line. They are shown in gray in the editor and **do not affect how the program runs.**
+
+```python
+attempt += 1  # Count the number of login attempts
+```
+You can read more about proper commenting in <a href="https://www.python.org/dev/peps/pep-0008/#comments">PEP 8 – Style Guide for Python Code</a>.

L01/lesson-info.yaml

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+custom_name: Introduction
+content:
+  - T01
+  - T02
+  - T03
+  - T04

L02/T01/ExerciseOperatorPrecedence.py

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+# Operator Precedence Exercise
+# Predict the output of each expression before you run the code
+# Replace each placeholder value with your prediction (as a number)
+
+# What will each of these print?
+answer_1 = 45.0
+
+answer_2 = 45.0
+
+answer_3 = 45.0
+
+answer_4 = 25.0
+
+answer_5 = 25

L02/T01/task-info.yaml

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+type: edu
+custom_name: Operators And Precedence
+files:
+  - name: task.md
+    visible: false
+  - name: ExerciseOperatorPrecedence.py
+    visible: true
+    placeholders:
+      - offset: 208
+        length: 4
+        placeholder_text: "# calculate (5 + 4) * 10 / 2"
+      - offset: 225
+        length: 4
+        placeholder_text: "# calculate ((5 + 4) * 10) / 2"
+      - offset: 242
+        length: 4
+        placeholder_text: "# calculate (5 + 4) * (10 / 2)"
+      - offset: 259
+        length: 4
+        placeholder_text: "# calculate 5 + (4 * 10) / 2"
+      - offset: 276
+        length: 2
+        placeholder_text: "# calculate 5 + 4 * 10 // 2"
+  - name: tests/test_task.py
+    visible: false

L02/T01/task.md

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+# Operator Precedence Exercise
+
+## Task
+Calculate the results for the five expressions below and fill in the answers in `ExerciseOperatorPrecedence.py`.
+Now calculate these 5 expressions and enter your answers.
+
+## Operator Precedence
+Python evaluates operators in this order (highest to lowest):
+1. `**` (exponentiation)
+2. `*`, `/`, `//`, `%` (multiplication, division, floor division, modulo)
+3. `+`, `-` (addition, subtraction)
+4. Parentheses `()` override the default order
+
+## Your Task
+Now calculate these 5 expressions and enter your answers.
+```python
+answer_1 = ...  # calculate (5 + 4) * 10 / 2
+answer_2 = ...  # calculate ((5 + 4) * 10) / 2
+answer_3 = ...  # calculate (5 + 4) * (10 / 2)
+answer_4 = ...  # calculate 5 + (4 * 10) / 2
+answer_5 = ...  # calculate 5 + 4 * 10 // 2
+```

L02/T01/tests/test_task.py

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+import importlib
+import importlib.util
+from io import StringIO
+import os
+import sys
+import unittest
+from unittest.mock import patch
+
+TASK_NAME = 'operator_precedence'
+TASK_FILE = os.path.join(
+    os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
+    'ExerciseOperatorPrecedence.py'
+)
+
+
+def try_import():
+    return importlib.import_module(TASK_NAME)
+
+
+class TestCase(unittest.TestCase):
+    task_name = TASK_NAME
+
+    def setUp(self):
+        try:
+            with patch('sys.stdout', new=StringIO()) as self.actualOutput:
+                if self.task_name in sys.modules:
+                    del sys.modules[self.task_name]
+                spec = importlib.util.spec_from_file_location(TASK_NAME, TASK_FILE)
+                module = importlib.util.module_from_spec(spec)
+                spec.loader.exec_module(module)
+                sys.modules[TASK_NAME] = module
+        except NameError:
+            pass
+        except SyntaxError as se:
+            self.fail("Syntax error while loading the solution – {0}. "
+                      "Please fill in all answers with valid numbers (empty placeholders are invalid)."
+                      .format(str(se)))
+        except Exception as e:
+            self.fail("There was a problem while loading the solution – {0}. Check the solution for "
+                      "IDE-highlighted errors and warnings.".format(str(e)))
+
+    def test_answer_1(self):
+        expected_value = 45.0
+
+        try:
+            actual_value = try_import().answer_1
+        except AttributeError:
+            self.fail(msg="The variable answer_1 seems to be undefined. Do not remove it from the task code.")
+
+        self.assertEqual(expected_value, actual_value, msg="The answer_1 value seems to be a bit off.")
+
+    def test_answer_2(self):
+        expected_value = 45.0
+
+        try:
+            actual_value = try_import().answer_2
+        except AttributeError:
+            self.fail(msg="The variable answer_2 seems to be undefined. Do not remove it from the task code.")
+
+        self.assertEqual(expected_value, actual_value, msg="The answer_2 value seems to be a bit off.")
+
+    def test_answer_3(self):
+        expected_value = 45.0
+
+        try:
+            actual_value = try_import().answer_3
+        except AttributeError:
+            self.fail(msg="The variable answer_3 seems to be undefined. Do not remove it from the task code.")
+
+        self.assertEqual(expected_value, actual_value, msg="The answer_3 value seems to be a bit off.")
+
+    def test_answer_4(self):
+        expected_value = 25.0
+
+        try:
+            actual_value = try_import().answer_4
+        except AttributeError:
+            self.fail(msg="The variable answer_4 seems to be undefined. Do not remove it from the task code.")
+
+        self.assertEqual(expected_value, actual_value, msg="The answer_4 value seems to be a bit off.")
+
+    def test_answer_5(self):
+        expected_value = 25
+
+        try:
+            actual_value = try_import().answer_5
+        except AttributeError:
+            self.fail(msg="The variable answer_5 seems to be undefined. Do not remove it from the task code.")
+
+        self.assertEqual(expected_value, actual_value, msg="The answer_5 value seems to be a bit off.")
+
+
+if __name__ == '__main__':
+    unittest.main()