GitHub Mode

GitHub Repository Submission

When using GitHub mode, paste your repository URL below and click Save URL to store it. The saved URL will be automatically included with every message you send until you choose to clear it. Learn more

GitHub Repository URL

Saved GitHub URL

Your GitHub repository URL is saved. LSBot will automatically fetch your latest code from this repository for each message. To change the URL, clear it first and save a new one.

Exercise 3

Write Python code to create a new tuple from (1, 2, 3, 4, 5). The new tuple should be in reverse order from the original. It should also exclude the first and last members of the original. The result should be the tuple (4, 3, 2).

Solution

my_tuple = (1, 2, 3, 4, 5)
my_list = list(my_tuple)
my_list.reverse()
result = tuple(my_list[1:4])
print(result)       # (4, 3, 2)

my_tuple = (1, 2, 3, 4, 5)
result = my_tuple[3:0:-1]
print(result)       # (4, 3, 2)

my_tuple = (1, 2, 3, 4, 5)
result = my_tuple[-2:-5:-1]
print(result)       # (4, 3, 2)

There are several ways to solve this problem. Your first inclination may have been to use the reverse method, as in Solution 1. However, reverse only works with lists, so we must first convert the tuple to a list. Even so, we have to slice the list, though the slice is a little cleaner.

Solutions 2 and 3 use the same approach by extracting a reversed slice. The only difference is how we specify the start and stop values for the slice. What makes these tricky is that the element indexed by the stop value is not included in the result. If you used one of these solutions, you likely started with an off-by-one bug.

Video Walkthrough

Hi! I'm LSBot. I can help you think through the selected exercise by giving you hints and guidance without revealing the solution. Your code from the editor will be automatically detected. Want to know more? Refer to the LSBot User Guide .

Detected solution

Deep Dive

Submit your solution for LSBot review.

Hi! I'm LSBot. Your code from the editor will be automatically detected. I'll review your solution and provide feedback to help you improve. Ask questions about your solution or request a comprehensive code review. Want to know more? Refer to the LSBot User Guide .

Detected solution

Normal Markdown & GFM

Github Flavored Markdown

**bold**

~~~~strike through~~~~

`single line of code`

Supports Emoji

Code Blocks

You can write code blocks using three backticks (```) followed by the language you want to show. For instance, if you wanted to write a Ruby code block you would write:

```ruby
class Foo
end
```

class Foo
end

You can also leave out the language identifier, doing this will make it so your code isn't highlighted at all, and all text will be white with no coloring.

```
class Bar
end
```

class Bar
end

Highlighting

You may highlight lines within your code blocks. This is a different type of highlighting, and isn't related to how the code within your code block may be colored depending on the language identifier used.
To highlight one or more lines of code, add # highlight on a separate line just before the first line you wish to highlight. To end highlighting, add # endhighlight on a separate line immediately after the last line you wish to highlight.

```ruby
def say_hello_world
# highlight
  puts 'Hello World!!!'
# endhighlight
end
```

def say_hello_world
# highlight
  puts 'Hello World!!!'
# endhighlight
end