今天在linux命令行使用scp命令拷贝一个目录到另一台服务器的时候,报如下错误: [root@hadoop01 ~]# scp flume -r hadoop02:/root/apps flume: not a regular file -r: No such file or directory [root@hadoop01 ~]# scp flume hadoop02:/root/apps/ flume: not a regular file 原来在使用scp拷贝一个目录(注意拷贝目录必须加
python每次处理一个字符的三种方法 a_string = "abccdea" print 'the first' for c in a_string: print ord(c)+1 print "the second" result = [ord(c)+1 for c in a_string] print result print "the thrid" def do_something(c): return ord(c)+1 result
用Python写了一个postgresql函数,感觉很爽 CREATE LANGUAGE plpythonu; postgresql函数 CREATE OR REPLACE FUNCTION myfun1(text) RETURNS text AS $BODY$ s = args[0] h = 0; n = len(s); for i, c in enumerate(s): h = h + ord(c)*31**(n-1-i); bits = 4*8; return (h +