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USE master; GO DECLARE @SQL VARCHAR(MAX); SET @SQL='' SELECT @SQL=@SQL+'; KILL '+RTRIM(SPID) FROM master..sysprocesses WHERE dbid=DB_ID('DataBaseName'); EXEC(@SQL); GO ALTER DATABASE DataBaseName SE... 阅读全文
摘要:
# -*- coding: utf-8 -*- def triangles(): n = 0 L = [1] while n < 20: yield L L = [1] + [L[i] + L[i+1] for i in range(n)] + [1] # n =0 时,循环语句【L[i] + L[i+1]】根本不会执行,所以不会报错 ... 阅读全文
摘要:
看到源码中有一段JS代码不太懂,如下: 里面这个 "!~" 符号看到后有点儿方啊O__O "…,毛线意思? 【查资料,解释如下】: indexOf returns -1 when an element cannot be found in an array. Therefore, the if st 阅读全文