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from pygments import highlight
from pygments.lexers import guess_lexer
from pygments.formatters.html import HtmlFormatter

def highlight_code(src, style='manni'):
    """This function highlight :param:`src` into html format using the style provided.

    :param src: The source code to highlight.
    :param style: The color style, valid style to see:

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import functools

def singleton(cls, *args, **kwargs):
    instances = {}

    @functools.wraps(cls)
    def wrapper():
        if cls not in instances:
            instances[cls] = cls(*args, **kwargs)
        return instances[cls]

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import sys
from cStringIO import StringIO
from contextlib import contextmanager

@contextmanager
def capture(command, *args, **kwargs):
    out, sys.stdout = sys.stdout, StringIO()
    command(*args, **kwargs)
    sys.stdout.seek(0)
    yield sys.stdout.read()

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logging.config.dictConfig({
        'version': 1,
        'disable_existing_loggers': False,
        'formatters': {
            'console': {'format': '[%(levelname)s %(asctime)s %(name)s] %(message)s'},
        },
        'handlers': {
            'console': {
                'level': 'INFO',
                'formatter': 'console',

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How hasattr implemented in Python

Python 2.7:

static PyObject *
builtin_hasattr(PyObject *self, PyObject *args)
{
    PyObject *v;

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缓存更新的几种策略

Cache aside

Read through

Write through

Write behind caching

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• CSS 优先级？

    1. !important
    2. inline
    3. id
    4. class （多个 class 按照定义顺序）
  

• Placeholder

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Pros

Cons

• 响应时间不稳定

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From Kafka to ZeroMQ for real-time log aggregation

Kafka

架构图：

Problems

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env LDFLAGS="-L$(brew --prefix openssl)/lib" CFLAGS="-I$(brew --prefix openssl)/include" pip install cryptography