[Tutor] Slicing index

[Mark Lawrence]

On 18/10/2020 13:57, Carlene Wong via Tutor wrote:
> Hello, I’m new but I’m getting trouble with slicing an index into another.
> Eg. Def mysentence (sentence, old, new)
>   If old in sentence[-4:]:
> n= sentence.index(old)
> newsent=Sentence [:n]+new
> return newsent
> return mysentence
> print(mysentence(“Hello there, it’s raining cats and cats”, “ cats”, “ dogs“)
> 
> It keeps printing
> Hello there, it’s raining dogs

No it doesn't, you'd fail at the 'Def' with an invalid syntax error and 
there's a colon missing at the end of the line.  Having said that 
looking at what you're trying to achieve why bother with string slicing, 
why not the string 'replace' method 
https://docs.python.org/3/library/stdtypes.html#str.replace ?

> 
> Your help
> 

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence