Some programmers prefer writing code in Python, because they find it more enjoyable than, e.g., Java or C++. These programmers look around for jobs mentioning Python, for obvious reasons.

Python is straightforward and intuitive, but I don’t think anyone can master it in a week. For example, programmers used to writing Java code tend to write long, unnecessarily over-structured, un-idiomatic Python code. This is not because they’re bad programmers, but because they aren’t used to writing Python, and haven’t read lots of good Python code.