At the other hand there are no examples for "por.
Can "por" also be interpreted as "by"
We included a link at the bottom of that lesson that takes you to a very similar use of por (not para) which is to express "a reason" (not purpose), so you can contrast those two lessons.
And yes, por can also be used to say "by [someone]". There is another specific lesson for this.
Here it is. Have a look.
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