How to find an integer equivalent of infinity as an index above all others?

By -

I am trying to work a list in Python. I want to insert new values, but at the extreme end of the list.

insert() works OK generally, but it takes two parameters: insert(0, 10) adds 10 to the left end of the list, as 0 is lower than (or equal to) the zeroth value in the list. so, if I start with a=[1,2,3,4,5],

z=a.insert(0, 10)

the new list looks like [10,1,2,3,4,5], which is as expected.

The key question is how to do this and insert at the end of the list. so, for example,this will work:

z = a.insert(100, 20)

gives:

z = [1,2,3,4,5,20]

since 100 is larger than the number of items in the list, thus placing it at the end. But, of course, that will fail to work right if there are more than 100 items in the list.

The logical choice is to define infinity, then use this code to add to the right-end, regardless of array size:

z = a.insert(infinity, 30)

Since I don't know the array size before starting, I am in a pickle. I have tried (1) using math.inf, as well as (2) using float("inf"). The first fails because "expected an integer but got a float", the second fails similarly. Trying to 'cast' it - i.e., top_index = int(float("inf")) - does not give an integer rep of positive infinity.

I could work around this by saying a.insert(len(a)+1, 30),

...but this seems hokey and requires additional steps (and tolls on speed).

How else can you insert above the highest indexed value?



from Recent Questions - Stack Overflow https://ift.tt/3zrI6fa
https://ift.tt/eA8V8J

Comments

Post a Comment

Popular posts from this blog

Today Walkin 14th-Sept

By -
Image
14th Sept 2017 ( GO Through all List) Read Walkin details properly , Try to call company before attending if possible !!! ==================================== 1. Myntra through fresherworld (Call Based , Venue shared to shortlisted candidates) _____________________________ 2. Magna : Hiring for Client Harman : C++
Read more

Spring Elasticsearch Operations

By -
Elasticsearch Operations Spring Data Elasticsearch uses two interfaces to define the operations that can be called against an Elasticsearch index. These are ElasticsearchOperations and ReactiveElasticsearchOperations. Whereas the first is used with the classic synchronous implementations, the second one uses reactive infrastructure. The default implementations of the interfaces offer: Read/Write mapping support for domain types. A rich query and criteria api. Resource management and Exception translation. ElasticsearchTemplate The ElasticsearchTemplate is an implementation of the ElasticsearchOperations interface using the Transport Client. @Configuration public class TransportClientConfig extends ElasticsearchConfigurationSupport {   @Bean   public Client elasticsearchClient() throws UnknownHostException {                      Settings settings = Settings.builder().put("cluster.name", "elasticsearch")....
Read more

Hibernate Search - Elasticsearch with JSON manipulation

By -
Elasticsearch with JSON manipulation Elasticsearch ships with many features. It is possible that at some point, one feature you need will not be exposed by the Search DSL. To work around such limitations, Hibernate Search provides ways to: Transform the HTTP request sent to Elasticsearch for search queries. Read the raw JSON of the HTTP response received from Elasticsearch for search queries. Direct changes to the HTTP request may conflict with Hibernate Search features and be supported differently by different versions of Elasticsearch. Similarly, the content of the HTTP response may change depending on the version of Elasticsearch, depending on which Hibernate Search features are used, and even depending on how Hibernate Search features are implemented. Thus, features relying on direct access to HTTP requests or responses cannot be guaranteed to continue to work when upgrading Hibernate Search, even for micro upgrades (x.y.z to x.y.(z+1)). Use this at your own risk....
Read more