From the flask release notes: Returning a dict from a view function will produce a JSON response. This makes it even easier to get started building an API. To get a minimal REST-Api all you have to do is: from flask import Flask app = Flask(__name__) @app.route(‘/return_dict’, methods=[‘GET’]) def return_dict(): return {“x”: “1”} if __name__…
When using PyInstaller to package an application to a self-containing bundle you might run into some pitfalls: Pitfall 1: PyInstaller overwrites spec file The first time you run pyinstaller you run it with pyi-makespec my_module.py instead of pyinstaller my_module.py pyi-makespec will generate a my_module.spec which you can alter. Afterwards you just ran pyinstaller my_module.spec to…
Let’s say you have a project with the following top level dependencies: xlrd money babel pyinstaller jinja2 pywin32 After installing them you have the following packages:
In my article Python Type Checking I wrote about type hints. Type hints are around the block since Python 3.5. Python 3.7 introduced another interesting concept to make Python code even more type safe: Protocols Duck typing If it walks like a duck and it quacks like a duck, then it must be a duck…
import unicodecsv def read_csv(filename): with open(filename, ‘rb’) as f: reader = unicodecsv.DictReader(f) return list(reader)
In Distributing your own package on PyPi I wrote about my first package on PyPI. Here are some refinements aka lessons learned: Project Description on PyPI I wondered why the project description on PyPi was empty. Solution: You need a long_description. If You already have a README.md, you can read it into a string and…
One of the things I always forget is date and time in Python. So message to myself: The strftime method is used for formatting (string_format_time) import datetime start_date = datetime.datetime.now() DATE_FORMAT = ‘%d/%m/%Y %H:%M’ print(start_date.strftime(DATE_FORMAT)) Her is a nice little Cheatsheet
Since Python 3.3 You can chain dictionaries which contain the same key in a prioritized order: from collections import ChainMap prio_1 = {“param_1”: “foo”} prio_2 = {“param_1”: “foobar”, “param_2”: “bar”} combined = ChainMap(prio_1, prio_2) print(combined[“param_1”]) # outputs ‘foo’ print(combined[“param_2”]) # outputs ‘bar’ The param_1 from the prio_1 dictionary is dominant, so it isn’t overwritten by…
In my article My personal road map for learning data science in 2018 I wrote about how I try to tackle the data science knowledge sphere. Due to the fact that 2018 is slowly coming to an end I think it is time for a little wrap up. What are the things I learned about…
In Regular Expressions Demystified I developed a little python package and distributed it via PyPi. I wanted to publish my second self-written package as well, but coming back after almost a year, some things have changed in the world of PyPi, i.e. the old tutorials aren’t working anymore. So I wrote this article to bring…