jlyonsmith

Common symbols

Modifiers

When a key combination is displayed, the modifiers are written in the order presented here. For example, Control + Option + Shift + Command + Q would be written as ⌃⌥⇧⌘Q.

Sym	Key	Alt
⌃	Control
⌥	Option

Haolicopter

def can_be_extended_to_solution(perm, n, m):
    # Too many non diagonal squares
    if perm.count(2) > m*m - n:
        return False

    new = len(perm) - 1
    # New square has no diagonal
    if perm[new] == 2:
        return True

dnmellen

from django import template

register = template.Library()


@register.filter
def cool_number(value, num_decimals=2):
    """
    Django template filter to convert regular numbers to a
    cool format (ie: 2K, 434.4K, 33M...)

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)