英文:
Use golang to achieve python's timer
问题
Python:
with Timer() as t:
# TODO a lot
print "scan all disks, cost: %s secs" % t.secs
现在，如何使用 golang 实现这个功能？
我已经在谷歌上搜索了，但是没有找到我想要的答案。
为什么我在这里发布问题然后被踩票？
谢谢你的帮助！
英文:
Python:
with Timer() as t :
// TODO a lot
print "scan all disks,cost:%s secs" % t.secs
Now,how to use golang to achieve this?
I had google this but I can not find any answers I want.
Why am I post my questions in here and then got downvote?
Thank you your help!!!
答案1
得分: 4
你可以编写一个函数，接受一个函数作为参数，运行它并打印时间：
import (
"time"
"fmt"
)
func TimeIt(f func(), description string) {
start := time.Now()
f()
fmt.Printf("运行 %s 花费了 %v\n", description, time.Since(start))
}
然后可以这样触发它：
func main() {
TimeIt(doSomething, "做某事")
}
或者将其作为闭包直接应用于代码片段：
TimeIt(func() {
do()
some()
stuff()
},
"任何事情")
英文:
You can write a function that accepts a function, runs it and prints the time:
import (
"time"
"fmt"
)
func TimeIt(f func(), description string) {
start := time.Now()
f()
fmt.Printf("Running %s took %v\n", description, time.Since(start))
}
And then trigger it like so:
func main() {
TimeIt(doSomething, "Doing something")
}
Or just sprinkle it on pieces of code as a closure:
TimeIt(func() {
do()
some()
stuff()
},
"whatever")
答案2
得分: 3
在Go语言中，另一种方法是定义一个计时器函数，并使用defer语句在函数返回时调用它。
package main
import (
"fmt"
"time"
)
func timer(start time.Time, description string) {
fmt.Printf("%s 耗时 %s\n", description, time.Since(start))
}
func main() {
func() {
defer timer(time.Now(), "扫描所有磁盘")
// TODO: 很多操作
}()
// 输出: 扫描所有磁盘 耗时 0s
}
你可以通过将特定命令包装到一个匿名函数中（参见上面的示例）来测量其执行时间，或者通过在函数顶部简单地放置defer语句来测量函数的执行时间，例如：
func foo() {
defer timer(time.Now(), "foo")
// ...
}
// 输出: foo 耗时 0s
英文:
Another way to do this in go is to define a timer function and use the defer statement to call it when the function returns.
package main
import (
"fmt"
"time"
)
func timer(start time.Time, description string) {
fmt.Printf("%s took %s\n", description, time.Since(start))
}
func main() {
func() {
defer timer(time.Now(), "scan all disks")
// TODO: alot
}()
// OUTPUT: scan all disks took 0s
}
You can measure the time of specific commands by wrapping them into an anonymous function (see above) or you measure the time of a function by simply putting the defer statement at its top, e.g.
func foo() {
defer timer(time.Now(), "foo")
// ...
}
// OUTPUT: foo took 0s
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