Programmer - Interplanety

To shift values in a list (replace the value at the first place of the list to its last place and vice versa), you need to rearrange the list with two slices.

The shift for the list:

forward:

and backward:

If a cyclic shift is necessary, repeat this command the required number of times in “for” cycle.

Each object’s class to be stored in JSON in a convenient for viewing way must have the __repr__ function, which returns the text representation of the object.

The dictionary with objects:

Saving the dictionary to JSON:

Tuples in python can be nested.

If simply add one tuple to another through the concatenation operation “+”, python will merge the values of the tuples:

In order an added tuple to become nested, put a comma “,” after an added tuple:

Obtaining the “centroid” – convex polygon central point coordinates, from polygons points (vertices) coordinates:

The input function parameter is a tuple with coordinates of the polygon points. The function returns a tuple with the centroid coordinates:

One of the for loops features in Python is that the iterated variable (counter) does not belong to the local scope of the loop.

For example, after executing the following code:

The “a” variable declared before the for loop will change its value if the variable with the same name “a”  declared as the loop counter.

It is necessary to remember about this feature, in order to avoid writing to the previously declared variable the values of the iterator of the for loop.