dz0

Serializer:

• is_valid(self, raise_exception=False) # usually called before self.save(..)
  • run_validation(self, data=empty)
    • validate_empty_values(self, data)
    • to_internal_value(self, data)
      • each DRF Field:
        • run_validation(self, data=empty)
          • validate_empty_values(self, data)
          • to_internal_value(self, data)
• run_validators(self, value)

dybber

import ure

def parseDateTime(datestr):
    regex = ("^(19|2[0-9][0-9][0-9])-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])"
             "T(0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(.([0-9]*))?"
             "((\\+|-)[0-1][0-9]:[0-9][0-9])?$")
    match = ure.match(regex, datestr)
    if match:
        year = int(match.group(1))
        month = int(match.group(2))

jackton1

from django.db import ProgrammingError, models
from django.db.models.constants import LOOKUP_SEP
from django.db.models.query import normalize_prefetch_lookups
from rest_framework import serializers
from rest_framework.utils import model_meta

class OptimizeModelViewSetMetaclass(type):
    """
    This metaclass optimizes the REST API view queryset using `prefetch_related` and `select_related`
    if the `serializer_class` is an instance of `serializers.ModelSerializer`.

wojteklu

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

alexcasalboni

Google Vision API Examples and Python utilities

Label Detection Examples

Face Detection Examples

erikroyall

Textbooks in Mathematics

A list of links to useful mathematical textbooks available for free on the Internet. They are all legal and maintained by their authors or by the legitimate publisher.

All the documents are in English. They are in a printable format - Postscript or Adobe Portable Document Format. You are free to download, read and print them. Here are some links to other sites offering lists of free mathematical textbooks.

For any comments, please, contact me: [email protected]

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

OnesimusUnbound

[T]he difference between a bad programmer and a 
good one is whether he considers his code or his 
data structures more important. Bad programmers 
worry about the code. Good programmers worry about 
data structures and their relationships. 
-- Linus Torvalds
~~~
Clarity and brevity sometimes are at odds. 
When they are, I choose clarity. 
-- Jacob Kaplan-Moss