jetbrains-academy / introduction_to_python

Introduction to Python course

Introduction to Python course (JetBrains Academy version)

This is an introductory Python course by JetBrains Academy. The target audience are the people with little or no experience in programming who would like to start learning Python.

In this course, you will learn about the basics, such as variables and operations with them, strings and other data structures, boolean operators, conditions, control flow, and so on. You will try implementing loops, functions, and classes, as well as using parts of your code as imported modules, and working with text files.

Have fun and good luck!

Want to know more?

If you have questions about the course or the tasks, or if you find any errors, feel free to ask questions and participate in discussions within the repository issues.

Contribution

Please be sure to review the project's contributing guidelines to learn how to help the project.

introduction_to_python's Issues

Test_issue 2 Test2

Not working still

Wrong answer File Input Output / Write to file

code is exactly the same as solution, but output shows incorrect

My code is exactly the same Functions / Definition

My code is exactly the same yet when I press check it says error.

Failed to launch checking. For more information, see the Troubleshooting guide. Data Structures / Tuples

Failed to launch checking. For more information, see the Troubleshooting guide
Failed to launch checking. For more information, see the Troubleshooting guide

Wrong operator in boolean_order.py

There is an operator "is" used incorrectly on line 8 of Condition expressions/Boolean operators order/boolean_order.py:
print(name is "Ellis" or not (name is "John" and age == 17))

there should be operator ==

3rd format string variable name is "is_equal" Variables / Boolean Operators

should be "is_true"

There is an error while checking the output. File Input Output / Write to file

There is an error while checking the output.
no error message

I have a picture of the error. Loops / List Comprehension

[Math Processing Error] between 'Output:' and 'Hint'.

Issue from a user: Need a comment edit on line 12 Loops / While loop

Print all squares from 0 to 99.

line 12 description does not match the solution required by the problem text, leading to an extra iteration of the loop causing the check to fail.

when I hit check it states a failure to launch. Strings / String Slicing

I typed a response but it won't check states "failed to launch checking"

Test Problem Task 1

Something does not work here
Test Problem

Variables / Variable Definition

"Check" button always shows incorect after checking
/usr/bin/python3.10 /home/sridip/pycharm-community-2022.3/plugins/python-ce/helpers/pycharm/_jb_pytest_runner.py --path /home/sridip/PycharmProjects/Introduction to Python/Variables/Variable definition/tests/test_task.py
Testing started at 10:19 pm ...
Launching pytest with arguments /home/sridip/PycharmProjects/Introduction to Python/Variables/Variable definition/tests/test_task.py --no-header --no-summary -q in /home/sridip/PycharmProjects/Introduction to Python/Variables/Variable definition

============================= test session starts ==============================
collecting ... collected 4 items

tests/test_task.py::TestCase::test_assignment_operator FAILED [ 25%]
tests/test_task.py:28 (TestCase.test_assignment_operator)
self = <test_task.TestCase testMethod=test_assignment_operator>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:

              importlib.import_module(self.task_name)

tests/test_task.py:24:

---

name = 'variable_definition', package = None

def import_module(name, package=None):
    """Import a module.

    The 'package' argument is required when performing a relative import. It
    specifies the package to use as the anchor point from which to resolve the
    relative import to an absolute import.

    """
    level = 0
    if name.startswith('.'):
        if not package:
            msg = ("the 'package' argument is required to perform a relative "
                   "import for {!r}")
            raise TypeError(msg.format(name))
        for character in name:
            if character != '.':
                break
            level += 1

  return _bootstrap._gcd_import(name[level:], package, level)

/usr/lib/python3.10/importlib/init.py:126:

---

name = 'variable_definition', package = None, level = 0

???

:1050:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???

:1027:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???
E ModuleNotFoundError: No module named 'variable_definition'

:1004: ModuleNotFoundError

During handling of the above exception, another exception occurred:

self = <test_task.TestCase testMethod=test_assignment_operator>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:
                importlib.import_module(self.task_name)
    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)))

E AssertionError: There was a problem while loading the solution – No module named 'variable_definition'. Check the solution for IDE-highlighted errors and warnings.

tests/test_task.py:26: AssertionError
FAILED [ 50%]
tests/test_task.py:37 (TestCase.test_assignment_operator2)
self = <test_task.TestCase testMethod=test_assignment_operator2>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:

              importlib.import_module(self.task_name)

tests/test_task.py:24:

---

name = 'variable_definition', package = None

def import_module(name, package=None):
    """Import a module.

    The 'package' argument is required when performing a relative import. It
    specifies the package to use as the anchor point from which to resolve the
    relative import to an absolute import.

    """
    level = 0
    if name.startswith('.'):
        if not package:
            msg = ("the 'package' argument is required to perform a relative "
                   "import for {!r}")
            raise TypeError(msg.format(name))
        for character in name:
            if character != '.':
                break
            level += 1

  return _bootstrap._gcd_import(name[level:], package, level)

/usr/lib/python3.10/importlib/init.py:126:

---

name = 'variable_definition', package = None, level = 0

???

:1050:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???

:1027:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???
E ModuleNotFoundError: No module named 'variable_definition'

:1004: ModuleNotFoundError

During handling of the above exception, another exception occurred:

self = <test_task.TestCase testMethod=test_assignment_operator2>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:
                importlib.import_module(self.task_name)
    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)))

E AssertionError: There was a problem while loading the solution – No module named 'variable_definition'. Check the solution for IDE-highlighted errors and warnings.

tests/test_task.py:26: AssertionError
FAILED [ 75%]
tests/test_task.py:58 (TestCase.test_chained_assignment)
self = <test_task.TestCase testMethod=test_chained_assignment>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:

              importlib.import_module(self.task_name)

tests/test_task.py:24:

---

name = 'variable_definition', package = None

def import_module(name, package=None):
    """Import a module.

    The 'package' argument is required when performing a relative import. It
    specifies the package to use as the anchor point from which to resolve the
    relative import to an absolute import.

    """
    level = 0
    if name.startswith('.'):
        if not package:
            msg = ("the 'package' argument is required to perform a relative "
                   "import for {!r}")
            raise TypeError(msg.format(name))
        for character in name:
            if character != '.':
                break
            level += 1

  return _bootstrap._gcd_import(name[level:], package, level)

/usr/lib/python3.10/importlib/init.py:126:

---

name = 'variable_definition', package = None, level = 0

???

:1050:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???

:1027:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???
E ModuleNotFoundError: No module named 'variable_definition'

:1004: ModuleNotFoundError

During handling of the above exception, another exception occurred:

self = <test_task.TestCase testMethod=test_chained_assignment>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:
                importlib.import_module(self.task_name)
    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)))

E AssertionError: There was a problem while loading the solution – No module named 'variable_definition'. Check the solution for IDE-highlighted errors and warnings.

tests/test_task.py:26: AssertionError
FAILED [100%]
tests/test_task.py:46 (TestCase.test_variable)
self = <test_task.TestCase testMethod=test_variable>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:

              importlib.import_module(self.task_name)

tests/test_task.py:24:

---

name = 'variable_definition', package = None

def import_module(name, package=None):
    """Import a module.

    The 'package' argument is required when performing a relative import. It
    specifies the package to use as the anchor point from which to resolve the
    relative import to an absolute import.

    """
    level = 0
    if name.startswith('.'):
        if not package:
            msg = ("the 'package' argument is required to perform a relative "
                   "import for {!r}")
            raise TypeError(msg.format(name))
        for character in name:
            if character != '.':
                break
            level += 1

  return _bootstrap._gcd_import(name[level:], package, level)

/usr/lib/python3.10/importlib/init.py:126:

---

name = 'variable_definition', package = None, level = 0

???

:1050:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???

:1027:

---

name = 'variable_definition', import_ = <function _gcd_import at 0x7f7591983400>

???
E ModuleNotFoundError: No module named 'variable_definition'

:1004: ModuleNotFoundError

During handling of the above exception, another exception occurred:

self = <test_task.TestCase testMethod=test_variable>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:
                importlib.import_module(self.task_name)
    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)))

E AssertionError: There was a problem while loading the solution – No module named 'variable_definition'. Check the solution for IDE-highlighted errors and warnings.

tests/test_task.py:26: AssertionError

tests/test_task.py::TestCase::test_assignment_operator2
tests/test_task.py::TestCase::test_chained_assignment
tests/test_task.py::TestCase::test_variable

============================== 4 failed in 0.14s ===============================

Process finished with exit code 1

Test Issue Test

Something does not work here

Check your repr() method.
<str_and_repr.Cat object at 0x10b2aabb0> != Cat, breed: sphynx, name: Kitty

Expected :Cat, breed: sphynx, name: Kitty
Actual :<str_and_repr.Cat object at 0x10b2aabb0>

Traceback (most recent call last):
File "/Users/Sofia.Kolchanova/Desktop/Introduction to Python/Classes and objects/str vs repr/tests/test_task.py", line 16, in test_repr
self.assertEqual(expected, actual, msg='Check your repr() method.')
AssertionError: 'Cat, breed: sphynx, name: Kitty' != '<str_and_repr.Cat object at 0x10b2aabb0>'

• Cat, breed: sphynx, name: Kitty

• <str_and_repr.Cat object at 0x10b2aabb0>
  : Check your repr() method.

test token Data Structures / Nested Lists

TEST
none

cannot check solution Classes and Objects / The self parameter

Cannot check solution

my solution is identical as given answer but fails Modules and Packages / Executing modules as scripts

My answer to the problem is identical as a given solution. When I 'peek at the solution' is says 'contents are identical'. Yet 'check' fails.
True is not false : You should move the last print statement in some_module into the main block.

problem! Variables

Test

Clicking "Next" breaks the UI. Variables / Undefined Variable - Not just this one

Before clicking "Next", I can interact with the Editor. Right click context menu and insert '|' prompt available for interaction. After clicking "Next", these two (at the very least) interface elements stop working. At first I thought that the .py file had become read-only. I'm not completely sure this isn't the case. No error messages are generated. I've tried watching the text output to the launch terminal, and examining the logs. I haven't been able to identify what the particular error is.

It is momentarily fixed by using: File -> Repair IDE -> Recovery step 3: 'Reopen Project' ". Doing this restores editor interaction... until 'Next' is clicked again. 100% reproducible.

I'm hoping someone can provide suggestions on how to better diagnose the issue.
I've checked for the Run tool window, but it isn't visible in my IDE. Where your illustration shows

"Version Control, >Run, =TODO, ... etc."

mine shows

"Version Control, Python Packages, =TODO, ... etc."

Expected output seems incorrect Classes and Objects / str vs repr

Task description instructions different from what the solution checker describes. My code is identical to the solution code, but checks as incorrect.

Expected output seems to have incorrect variables?

bad task Some task

some description

test issue Introduction / About

test

Some Task I do not understand the task

bug

buggy Booleans

problem!

Variables Doesn't accept the correct answer

bug

Test issue Definition

Test

import cache used in Module and packages / Executing modules as script

If you first check the solution without the

if __name__ == '__main__':

then correct it with the if clause, the checker still gives an error. Even if the peak solution shows two identical scripts.

This is probably caused by caching of

import task

in the checker.

problem task/task

description

Failed to launch checking Data Structures / Nested Lists

Failed to launch checking

test 2 Variables/Boolean Operators

Test 2

Test Functions/Definition

Test issue

Incorrect even with correct answer File Input Output / Write to file

My exercise keeps incorrect, even with copying 1 to 1 the same as the peek solution
False is not true : The third line in the output should be "15".

define a variable and print Variables / Undefined Variable

I define a variable and tried to print it. It says I am wrong.
NameError not raised : Try printing a variable that was not defined.

problem in task - test task

Description

Check button didn't work Strings / String Slicing

If I type anything on the task the check button didn't work with this message: "Failed to launch checking. For more information, see the Troubleshooting guide".
I didn't have any error message because the check button didn't work.

Variables / Arithmetic Operators

In the task you're asked to add the 'division result' with the 'multiplication result' but the solution requires the 'division remainder' to be added to the 'multiplication result'.

Essentially what the task calls for vs what the solution are don't match.

Subtraction appears to use wrong vars Variables / Arithmetic Operators

"subtraction _result" asks you to "subtract the division result from the number" but the expected code shows the solution as the "number" - the "multiplication result"

Incorrect "output" showed Functions / Recursion

Hi guys, in your example in description you are providing "4" as an argument for function "countdown(n)" and as result of execution of this function you showed: "10 9 8 7 6 5 4 3 2 1 0" what is incorrect of course, because countdown will start from 4 and not 10. So, correct execution result should be: "4 3 2 1 0 "

Typo for "three" at the last task Variables / Comparison Operators

Typo for "three" at the last task

placeholder for division remainder says "argument" Variables / Arithmetic Operators

change "argument" to "remainder"

Wrong variable is printed at line 13 Variables / Comparison Operators

At line 13 it should be: print(f"one is smaller than three: {is_less}")
There's no error

Non-critical typo in line 10 Condition Expressions / Else and Elif

None' is misspelled as 'non'

failed to launch checking Strings / String Length

does not check. in the tasks before this check, they passed without problems
Failed to launch checking. For more information, see the Troubleshooting guide

chain assignment Variables / Variable Definition

It is not readily apparent that there is an a before the # sign. I will change my colour preferences on the IDE

memory leak Functions / Return value

Hello, trying to have my solution for this task checked results in a continuos process that draws 10 GB of RAM

It's Showing Error, even after I entered right code Write a function that returns a list of numbers of the Fibonacci sequence up to n.

By Comparing with peek solution, there is no difference. However, it's showing Error even after I'm getting expected output

Test 1 Variables/Variable Definition

Test 1

Doesn't work Task 1

Tests do not pass

Some Task I do not understand the task

bug

Program shows me "incorrect", but my solution is the same as peek solution File Input Output / Write to file

This is the output file.\n' != '\n' Expected is: This is the output file. My code is: zoo = ["lion", "elephant", "monkey"]
number = 15

with open("output.txt", 'a') as f:
f.write('\n' + ' and '.join(zoo))
f.write('\n' + str(number))
This is the output file.\n' != '\n'

Introduction / Comments

When I am clicking the option "CHECK' in task window it is showing "Incorect" everytime. But I did everything what the task instructed me to do.
/usr/bin/python3.10 /home/sridip/pycharm-community-2022.3/plugins/python-ce/helpers/pycharm/_jb_pytest_runner.py --path /home/sridip/PycharmProjects/Introduction to Python/Introduction/Comments/tests/test_task.py
Testing started at 10:11 pm ...
Launching pytest with arguments /home/sridip/PycharmProjects/Introduction to Python/Introduction/Comments/tests/test_task.py --no-header --no-summary -q in /home/sridip/PycharmProjects/Introduction to Python/Introduction/Comments

============================= test session starts ==============================
collecting ... collected 2 items

tests/test_task.py::TestCase::test_assignment_operator FAILED [ 50%]
tests/test_task.py:28 (TestCase.test_assignment_operator)
self = <test_task.TestCase testMethod=test_assignment_operator>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:

              importlib.import_module(self.task_name)

tests/test_task.py:24:

---

name = 'comments', package = None

def import_module(name, package=None):
    """Import a module.

    The 'package' argument is required when performing a relative import. It
    specifies the package to use as the anchor point from which to resolve the
    relative import to an absolute import.

    """
    level = 0
    if name.startswith('.'):
        if not package:
            msg = ("the 'package' argument is required to perform a relative "
                   "import for {!r}")
            raise TypeError(msg.format(name))
        for character in name:
            if character != '.':
                break
            level += 1

  return _bootstrap._gcd_import(name[level:], package, level)

/usr/lib/python3.10/importlib/init.py:126:

---

name = 'comments', package = None, level = 0

???

:1050:

---

name = 'comments', import_ = <function _gcd_import at 0x7fb59e19f400>

???

:1027:

---

name = 'comments', import_ = <function _gcd_import at 0x7fb59e19f400>

???
E ModuleNotFoundError: No module named 'comments'

:1004: ModuleNotFoundError

During handling of the above exception, another exception occurred:

self = <test_task.TestCase testMethod=test_assignment_operator>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:
                importlib.import_module(self.task_name)
    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)))

E AssertionError: There was a problem while loading the solution – No module named 'comments'. Check the solution for IDE-highlighted errors and warnings.

tests/test_task.py:26: AssertionError
FAILED [100%]
tests/test_task.py:35 (TestCase.test_output_len)
self = <test_task.TestCase testMethod=test_output_len>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:

              importlib.import_module(self.task_name)

tests/test_task.py:24:

---

name = 'comments', package = None

def import_module(name, package=None):
    """Import a module.

    The 'package' argument is required when performing a relative import. It
    specifies the package to use as the anchor point from which to resolve the
    relative import to an absolute import.

    """
    level = 0
    if name.startswith('.'):
        if not package:
            msg = ("the 'package' argument is required to perform a relative "
                   "import for {!r}")
            raise TypeError(msg.format(name))
        for character in name:
            if character != '.':
                break
            level += 1

  return _bootstrap._gcd_import(name[level:], package, level)

/usr/lib/python3.10/importlib/init.py:126:

---

name = 'comments', package = None, level = 0

???

:1050:

---

name = 'comments', import_ = <function _gcd_import at 0x7fb59e19f400>

???

:1027:

---

name = 'comments', import_ = <function _gcd_import at 0x7fb59e19f400>

???
E ModuleNotFoundError: No module named 'comments'

:1004: ModuleNotFoundError

During handling of the above exception, another exception occurred:

self = <test_task.TestCase testMethod=test_output_len>

def setUp(self):
    try:
        # Stores output from print() in actualOutput
        with patch('sys.stdout', new=StringIO()) as self.actualOutput:
            # Loads submission on first test, reloads on subsequent tests
            if self.task_name in sys.modules:
                importlib.reload(sys.modules[self.task_name])
            else:
                importlib.import_module(self.task_name)
    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)))

E AssertionError: There was a problem while loading the solution – No module named 'comments'. Check the solution for IDE-highlighted errors and warnings.

tests/test_task.py:26: AssertionError

tests/test_task.py::TestCase::test_output_len

============================== 2 failed in 0.07s ===============================

Process finished with exit code 1