Python data scientist sollicitatievragen

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Sollicitatievragen voor Python Data Scientist gedeeld door sollicitanten

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Tengizchevroil
Er werd een ETL Data engineer Python gevraagd...19 januari 2021

what is index and what is it used for?

1 antwoorden

i said index is to speed up query execution, the results of running a query are saved for faster performance, like caching Minder

Client Server

Can you alter the contents of a string object?

1 antwoorden

No

BairesDev

What are magic methods in Python and what are they used for?

1 antwoorden

These are special methods surrounded by double underscores, such as __init__, __repr__, __str___ __setitem__, __getitem__, __enter__, __exit__, __add__, __mult__, __next__ and so on... The interpreter invokes them in certain situations, such as when creating an object, converting it to string via built-in str() function. They are used for operator overloading, i.e. to make expressions such as a + b or a * b, or a[ i ] work for custom defined classes and not just for numbers, or arrays. Minder

BairesDev

What are the common built-in data structures in Python and what is the syntax for each?

1 antwoorden

Lists (arrays), dictionaries, sets. Lists: Square brackets, indexing with integers. Dictionaries: Curly brackets indexing with strings or any hashable thing. Minder

Tengizchevroil

what is lazy evaluation in spark?

1 antwoorden

lazy evaluation is when you put all things you want to do with data in order and only when you call 'execute' it does the heavy lifting and actually processes the data Minder

Binary Tech

why we use python and why not others languages

1 antwoorden

i said python easy to use and learn .it is object-oriented language

Wealth42

Q : Describe your final year project (The one which I had mentioned on my Resume) ?

1 antwoorden

I tried to give a gist of what my Final Year project was all about and what role I played completing it. Minder

CGG

I think there was a question about how to solve the vanishing gradient problem within a deep neural network.

1 antwoorden

ResNet

BairesDev

What's the difference between overloading and overriding?

1 antwoorden

Overloading: you have different methods or functions with the same name. At compile time the compiler chooses which one to apply based on the types of the passed arguments. Overriding: A base class has a method and a derived class redefines it with the same signature. The decision on which to use might happen at compile time or at dynamically runtime if the type of the object is only known then (dynamic dispatch). Minder

X-Team

Join three tables... or something along those lines. Again, my SQL is rusty.

1 antwoorden

By trying, and failing.

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