andreypopp

class PGArrayField(models.Field):
    """ Custom field for mapping between postgresql array and python list."""

    def __init__(self, element_field, **kwargs):
        self.element_field = element_field
        models.Field.__init__(self, **kwargs)

    def db_type(self, *connection):
        return '%s[]' % self.element_field.db_type(*connection)

andreypopp

class TestModel(models.Model):

    f = models.TextField()
    a = PGArrayField(models.IntegerField(), null=True)

andreypopp

""" Contract2."""

class ValidationError(TypeError):
    pass

class Type(object):

    def validate(self, value):
        raise NotImplementedError()

andreypopp

""" Validating Python data structures."""

__all__ = (
    "ValidationError", 
    "Type", "Or", "And", "Optional", "NullType", "Nullable", "Null",
    "IntType", "StringType", "BoolType",
    "Int", "String", "Bool",
    "Sequence", "Mapping")

class ValidationError(TypeError):

andreypopp

Prelude> let ngrams n seq@(_:tail) | length seq >= n = (take n seq):(ngrams n tail); ngrams _ _ = []
Prelude> ngrams 1 [1,2,3]
[[1],[2],[3]]
Prelude> ngrams 2 [1,2,3]
[[1,2],[2,3]]
Prelude> ngrams 3 [1,2,3]
[[1,2,3]]

andreypopp

class S[A, B, C] {
  def apply[A, B, C](f: A => (B => C), g: A => B, x: A): C =
    (f(x))(g(x))
}

andreypopp

mpb % python -m timeit -s 'from peg import expr, parse' "parse(expr, '1+1+3+123-12*(1212+2)')"
1000 loops, best of 3: 231 usec per loop
mpb % pypy -m timeit -s 'from peg import expr, parse' "parse(expr, '1+1+3+123-12*(1212+2)')"
1000 loops, best of 3: 30.6 usec per loop

andreypopp

from peg import *
from collections import namedtuple

Select          = namedtuple("Select",
    ["select_list", "from_clause", "where_clause", "offset_clause", "limit_clause"])
From            = namedtuple("From", ["table", "joins"])
_Ref            = namedtuple("Ref", ["parts"])
Join            = namedtuple("Join", ["table", "condition"])
AllColumns      = namedtuple("AllColumns", [])
UsingJoinCond   = namedtuple("UsingJoinCond", ["columns"])

andreypopp

#!/usr/bin/env python
"""usage: bte file

arguments:

    file            filename or - to read from stdin

options:

    -h, --help      show this message and exit

andreypopp

"" We don't like plain vi
set nocompatible
filetype off

"" Initialize pathogen
call pathogen#helptags()
call pathogen#runtime_append_all_bundles()

"" Preferences
let mapleader=","