Python

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Formating

str = "world"

# will concat to "hello world"
greeting = "hello %s" % (str)

format numbers

# will set month to  01, 02, .... 09, 10, 12
month = "%02d" % (now.month)

importing

from datetime import datetime

Object, Instance

def isPair(obj):
  return isinstance(obj, Pair)

class Pair:
  def __init__(self, x, y):
    self.x = x
    self.y = y

  def __repr__(self):
    return f'Pair: {self.x},{self.y}'

p = Pair(1,2)

# this is True
print(isPair(p))

# this is False
print(isPair(42))