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Merge pull request #171 from entwanne/needles-haystack-example-6

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Fix explanation for 6th example of "Needles in a Haystack"
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Satwik Kansal 2020-01-12 00:33:30 +05:30 committed by GitHub
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@ -2579,7 +2579,7 @@ def similar_recursive_func(a):
* As for the fifth snippet, most methods that modify the items of sequence/mapping objects like `list.append`, `dict.update`, `list.sort`, etc. modify the objects in-place and return `None`. The rationale behind this is to improve performance by avoiding making a copy of the object if the operation can be done in-place (Referred from [here](http://docs.python.org/2/faq/design.html#why-doesn-t-list-sort-return-the-sorted-list)).
* Last one should be fairly obvious, passing mutable object (like `list` ) results in a call by reference, whereas an immutable object (like `int`) results in a call by value.
* Last one should be fairly obvious, mutable object (like `list`) can be altered in the function, and the reassignation of an immutable (`a -= 1`) is not an alteration of the value.
* Being aware of these nitpicks can save you hours of debugging effort in the long run.