dawranliou

from itertools import count

numbers = count()
next(numbers)  # 0
next(numbers)  # 1
next(numbers)  # 2
next(numbers)  # 3
#...

dawranliou

def number_generator():
    i = 0
    while True:
        yield i
        i += 1
numbers = number_generator()
next(numbers)  # 0
next(numbers)  # 1
next(numbers)  # 2
next(numbers)  # 3

dawranliou

>>> range(10)
range(0, 10)
# Use list() to evaluate the range object
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

dawranliou

user=> (range 10)
(0 1 2 3 4 5 6 7 8 9)

dawranliou

user=> range
#object[clojure.core$range xxxxxxxx]

;; Don't do this in your repl!
;; (range)

;; Do this instead
user=> (take 4 (range))
(0 1 2 3)

dawranliou

from time import perf_counter
from array import array
from contextlib import contextmanager

@contextmanager
def timing(label: str):
    t0 = perf_counter()
    yield lambda: (label, t1 - t0)
    t1 = perf_counter()

dawranliou

import socket

def ping(host, port):
    """A generator to ping a particular application.

    Return True if the destination port is occupied
    Example:
        >>> # ping application at port 99
        >>> pinger = ping('127.0.0.1', 99)
        >>> # When there's no application ruuning

dawranliou

"Utilities to help solving problems."
import itertools
import functools
from collections import Counter
from operator import mul, pow

def prime_factors(num):
    """ Yield the factors of a given number."""
    i = 2
    while i * i <= num:

dawranliou

class Node:
    def __init__(self, v):
        self.v = v
        self.l = None
        self.r = None
    def __repr__(self):
        return '<Node %d>' % self.v


def children(node):

dawranliou

import argparse

def total_payment(principal, monthly_rate, payment_months):
    return principal * (1 + monthly_rate) ** payment_months

def monthly_payment(principal, monthly_rate, payment_months):
    weighted_month = ((1 + monthly_rate) ** payment_months - 1) / monthly_rate
    return total_payment(principal, monthly_rate, payment_months) / weighted_month

print('--------------------------------------------')