Learn more about computerscience with this collection
Understanding machine learning models
Improving data analysis and decision-making
How Google uses logic in machine learning
Unpacking variables are probably most used for functions that return multiple variables, such as in the example below.
But it is also useful for data types that contain multiple items. The only important notion here is that, if not otherwise defined, variable unpacking results in tuples
.
The _
operator is an unnamed variable , essentially a variable that you’re not interested in and won’t be doing anything with, for instance in the following case:
2
21 reads
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Dictionaries are great data-types for storing values
with an attribute field known as the key
, in so-called key-value pairs
. When extracting key-value pairs from dictionaries, avoid running into KeyError
exceptions with the .get
m...
2
17 reads
I love the zip
function and it has saved me countless (nested) loops. I use it mostly for iterating over two data types at the same time, where I need the indexes to be equal.
You can do this with any data type or generator. For instance, you could create dictionaries without l...
2
18 reads
the *
prefix operator was added to the multiple assignment syntax, allowing us to unpack the remaining items in an iterable.
The **
operator does something similar, but with keyword arguments. The **
operator allows us to take a dictionary of key-value...
3
17 reads
List, tuple, and dictionary comprehensions are ways to code more efficiently: do the same in fewer lines of code.
Both lines 2-4
and lines 13-15
are compressed in single-line expressions in line 6
and line 17
. This saves up unnecessary lo...
2
14 reads
Hallelujah! That is what I thought when I learned about the Python 3.6+ update that includes a new way of formatting strings: the Python formatted string literal. String formatting in Python has come a long way.
F-strings consider everything within { curly brackets } as an ...
3
54 reads
Making your Python code as re-usable as possible should be one of your main concerns. But what if you’re working on a Unix platform and your colleague is working on Windows?
The path delimiter on Windows is \
, but on my Linux or Mac system, it is /
. Avoid dealing...
2
29 reads
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UV radiation has enough energy to break chemical bonds. UV photons can cause ionization, meaning chemical bonds will break that otherwise would not.
It can be useful, for instance, in disinfecting a surface, but it can also damage materials and living tissues, part...
When you mix practice between two similar ideas or concepts, you’re better able to notice the difference between the two.
This discriminative account in favour of variable practice holds true for many problem-solving skills. Math problems are often taught in a blocked fashion. You learn so...
Jest offers describe
function to help structure your tests. Use describe
to group together all tests that belong to one functionality. Describes can be nested, if you need that. Other functions you'll commonly u...
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