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How to debug a Flask app
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export FLASK_APP=/daemon/api/views.py # path to app
export FLASK_DEBUG=1
python -m flask run --host=0.0.0.0
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How to write header row with csv.DictWriter?
...e csvfile.
Put another way: The Fieldnames argument is required because Python dicts are inherently unordered.
Below is an example of how you'd write the header and data to a file.
Note: with statement was added in 2.6. If using 2.5: from __future__ import with_statement
with open(infile,'rb') a...
Calling parent class __init__ with multiple inheritance, what's the right way?
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If you are writing python (hopefully 3!) and using inheritance of any sort, but especially multiple, then rhettinger.wordpress.com/2011/05/26/super-considered-super should be required reading.
– Shawn Mehan
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What's the fastest way to do a bulk insert into Postgres?
... is slower than using COPY but it is useful to me in work with psycopg and python (python list passed to cursor.execute becomes pg ARRAY):
INSERT INTO tablename (fieldname1, fieldname2, fieldname3)
VALUES (
UNNEST(ARRAY[1, 2, 3]),
UNNEST(ARRAY[100, 200, 300]),
UNNEST(ARRAY['a', 'b', '...
Convert hex to binary
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docs.python.org/library/binascii.html is subtitled Convert between binary and ASCII. Doesn't that mean it returns a string?
– pavium
Sep 15 '09 at 6:58
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How to dump a dict to a json file?
... Good thing to remember here is that unless you use an OrderedDict (python >2.7) there is no guarantee that keys are ordered in any particular manner
– ford prefect
Aug 1 '17 at 18:08
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List comprehension in Ruby
To do the equivalent of Python list comprehensions, I'm doing the following:
17 Answers
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How to replace a set of tokens in a Java String?
...ppend()s and I was thinking "Surely there's a better way... something more Pythonic..." - and holy crap, I think this method may predate Python's formatting methods. Actually... this may be older than 2002... I can't find when this actually came into existence...
– ArtOfWarfare...
Assert a function/method was not called using Mock
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Hmm. That's odd. I'm running Python 2.7.1 and am using unittest and from mock import Mock with Python Mock 0.1.0 for my tests. Does any of that sound problematic?
– Nathan Arthur
Nov 19 '14 at 16:18
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Markdown to create pages and table of contents?
...ere might also be the one or the other library, who can generate TOCs: see Python Markdown TOC Extension.
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