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spider

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Python Scope

HELLO = 1

# GLOABLS 字典值包含 __builtins__, __doc__等通用的全局内建函数,模块,
# 以及刚才定义的 HELLO
GLOABLS = globals()

lttzzlll

mysql

1. 主键 超键 候选键 外键

主 键：

数据库表中对储存数据对象予以唯一和完整标识的数据列或属性的组合。一个数据列只能有一个主键，且主键的取值不能缺失，即不能为空值（Null）。

超 键：

lttzzlll

HTTPS

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rs0 = 
    SELECT 
        Start, 
        Region, 
        Duration/60.0 AS DurationInMinutes
    FROM searchlog
    HAVING DurationInMinutes >= 20;
// 

rs1 = 

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import time
from functools import wraps


def log(level='debug'):
    if not hasattr(level, '__call__'):
        def wrapper(func):
            @wraps(func)
            def inner(*args, **kwargs):
                start = time.time()

lttzzlll

import unittest
import random


def partation(nums, low, high):
    pivot = nums[random.randrange(low, high + 1)]
    while low <= high:
        while low <= high and nums[low] < pivot:
            low += 1

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import unittest

class Node:
    def __init__(self, val):
        self.val = val
        self.next = None

def reverse(p):
    if p is None and p.next is None:
        return p

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import random
import unittest


def siftdown(heap, top, end):
    pos = end
    newitem = heap[pos]
    while pos > top:
        parentpos = (pos - 1) >> 1
        parent = heap[parentpos]

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import random
import unittest




def siftdown(heap, top, end):
    pos = end
    newitem = heap[pos]
    while pos > top: