摘要：如何写一个简单的分布式知乎爬虫？ https://www.jianshu.com/p/a2a07ed07161 Python爬虫系列——入门到精通 https://www.jianshu.com/p/d1ab04857964 阅读全文

摘要：SELECT bd.device_no AS 设备编号, SUM(IFNULL(bu.amount,0)) as 总营收, SUM(CASE WHEN bu.is_online = 0 THEN bu.amount ELSE 0 END) as 线上, SUM(CASE WHEN bu.is_online = 1 THEN bu.amount ELSE 0 END) as 线下 FROM... 阅读全文

摘要：import sys def Collatz(X): print(X) if X % 2 == 0: t = X//2 Collatz(t) elif X == 1: sys.exit() else: t = 3 * X + 1 Collatz(t) number = int(in... 阅读全文

摘要：方法一： 方法二： 推荐使用方法二 阅读全文

摘要：allGuests = { 'A':{'apples':5,'pretzels':12}, 'B':{'hs':3,'apples':2} } def total(guests,item): num = 0 for k in guests: num = num +guests[k].get(item,0) return num print(... 阅读全文

摘要：def hello(): S = 0 Low = int(input('请最小得币数：')) High = int(input('请最大得币数：')) if High < Low: print ('最大得币数不能大于最小得币数') hello() i = int(input('请输入系数：')) QS = [Q fo... 阅读全文

摘要：1 切片:取多个元素 2 >>> names = ["A","B","C","D","E","F"] 3 >>> names[1:4] #取下标1至下标4之间的数字，包括1，不包括4 4 ['B', C', 'D'] 5 >>> names[1:-1] #取下标1至-1的值，不包括-1 6 ['B', 'C', 'D', 'E& 阅读全文