As a software engineer, please write an algorithmic function in Python that satisfies the following requirements -

algorithmic requirement

As a software engineer, write an algorithmic function in Python that fulfills the following requirement -- Given a string X, output the string consisting of characters at odd positions in X (position numbering starts at 1). Example -- Input: a = "xyzwd"; Output: "xzd"; Input: a = "0123456789"; Output: "02468"

Please as a data science expert. I would like to build a [Purpose of the model] The model, meanwhile, is capable of [Additional requirements] Techniques. Please recommend relevant training datasets and give code to load the datasets into Python.

Please as a data science expert. I would like to build a model [for predicting video sales] that also [incorporates computer vision] techniques. Please recommend a relevant training dataset and give code to load the dataset into Python.

[Original data set]