1. Apprendre
    2. /
  2. Cours
    3. /
  3. Introduction to MongoDB in Python
  • 1

    Flexibly Structured Data

    Gratuit

    This chapter is about getting a bird's-eye view of the Nobel Prize data's structure. You will relate MongoDB documents, collections, and databases to JSON and Python types. You'll then use filters, operators, and dot notation to explore substructure.

  • 2

    Working with Distinct Values and Sets

    Now you have a sense of the data's structure. This chapter is about dipping your toes into the pools of values for various fields. You'll collect distinct values, test for membership in sets, and match values to patterns.

  • 3

    Get Only What You Need, and Fast

    You can now query collections with ease and collect documents to examine and analyze with Python. But this process is sometimes slow and onerous for large collections and documents. This chapter is about various ways to speed up and simplify that process.

  • 4

    Aggregation Pipelines: Let the Server Do It For You

    You've used projection, sorting, indexing, and limits to speed up data fetching. But there are still annoying performance bottlenecks in your analysis pipelines. You still need to fetch a ton of data. Thus, network bandwidth and downstream processing and memory capacity still impact performance. This chapter is about using MongoDB to perform aggregations for you on the server.

Initializing

Exercice

The first five prizes with quarter shares

Find the first five prizes with one or more laureates sharing 1/4 of the prize. Project our prize category, year, and laureates' motivations.

Instructions

100 XP
  • Save to filter_ the filter document to fetch only prizes with one or more quarter-share laureates, i.e. with a "laureates.share" of "4".
  • Save to projection the list of field names so that prize category, year and laureates' motivations ("laureates.motivation") may be fetched for inspection.
  • Save to cursor a cursor that will yield prizes, sorted by ascending year. Limit this to five prizes, and sort using the most concise specification.