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February 22, 2020 20:50
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A palindrome is a phrase that, if reversed, would read the exact same. Write code that checks if p_phrase is a palindrome by reversing it and then checking if the reversed version is equal to the original. Assign the reversed version of p_phrase to the variable r_phrase so that we can check your work.
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| p_phrase = "was it a car or a cat I saw" | |
| r_phrase = p_phrase[::-1] |
Got it. Thanks.
…On Thu, May 14, 2020, 5:15 PM Mayank Dawar ***@***.***> wrote:
***@***.**** commented on this gist.
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can you explain line no 41(r_phrase = p_phrase[::-1])?
i really need an explanation
I have done string slicing here, [ a: b: c]
here a represents starting index of the given string and b represents the
last index of string and c represents the step size.
-1 represents the backward step and as if don't mention any value of a and
b it means we are inputting complete string as an input. I have also
attached an image with this u can see some examples of slicing
[image: Screenshot (16)]
<https://user-images.githubusercontent.com/41851148/81927715-9fcef500-95d3-11ea-9ec4-40e1a1416113.png>
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Why can't we use the reverse() method?
Why can't we use the reverse() method?
reverse() function can only be used in case of lists. It will show an error if we use this for string.
Thank you
p_phrase = "was it a car or a cat I saw"
phrase = []
for letter in p_phrase:
phrase.append(letter)
phrase.reverse()
r_phrase= ''
r_phrase = "".join(phrase)
print(r_phrase)
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I have done string slicing here, [ a: b: c]
here a represents starting index of the given string and b represents the last index of string and c represents the step size.
-1 represents the backward step and as if don't mention any value of a and b it means we are inputting complete string as an input. I have also attached an image with this u can see some examples of slicing