Python: Changing variables
The word “variable” itself suggests that it can be changed. And indeed, the values of variables can change over time within the program.
For example:
# greeting
greeting = 'Father!'
print(greeting) # => Father!
greeting = 'Mother!'
print(greeting) # => Mother!
The name remained the same, but there were different data inside. Note that variables in Python require no special declaration. Instead, a variable is declared when it is first used in a program.
Variables are a powerful yet risky thing. You can't be sure right away what'll be inside it - first you have to analyze the code that comes before the variable. This is what developers do during debugging, when they try to figure out why the program doesn't work as intended.
Instructions
In the exercise, a variable is defined with a string inside it. Override the value of this variable and assign it a string in which the characters of the original string are arranged in reverse order.
Note: in this assignment, you'll have to write code between lines with comments # BEGIN and # END (we mentioned it before, but this is the first time you've come across this format).
Definitions
- Variable
- a way to save information and name it for later use in code.
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
My code is different from the teacher's one 🤔
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
I've read the lessons but nothing is clear 🙄
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.
Your exercise will be checked with these tests:
1from hexlet.test import expect_output
2
3
4def test(capsys):
5 expected = 'anneirB'
6 expect_output(capsys, expected)
7Teacher's solution will be available in:
