# list元素求和 sum = reduce(lambda x,y: x+y, mylist) # 比较两个 lists 的元素是否完全一致 if all(x==y for x, y in zip(X, Y)) do something # 按照 key 排列字典的元素,以libsvm格式输出 sorted(dd.keys()) sorted_dict = [(key, dd[key]) for key in sorted(dd.keys())] # 以libsvm格式打印5 print '…
导出到json: $ mongoexport.exe -d TestDB -c TestCollection -o ./test.json 导出到csv: If you want to output CSV, you have to specify the fields in the order you want them. $ mongoexport.exe --csv -f _id,f1,f2,f3,f4,f5,f6,f7 -d TestDB -c TestCollection -o…
import 语句用于导入从外部模块,另一个脚本等导出的函数,对象或原语. 注意:此功能目前无法在任何浏览器中实现.它在许多转换器中实现,例如 Traceur Compiler , Babel , Rollup 或 Webpack. 语法EDIT import defaultMember from "module-name"; import * as name from "module-name"; import { member } from "modu…
转自: http://codingstandards.iteye.com/blog/604541 MySQL中导出CSV格式数据的SQL语句样本如下: select * from test_info into outfile '/tmp/test.csv' fields terminated by ',' optionally enclosed by '"' escaped by '"' lines terminated by '\r\n'; MySQL中导入CSV格式数据的SQL…