大约有 47,000 项符合查询结果（耗时：0.0559秒） [XML]
How do I replace NA values with zeros in an R dataframe?
...want to apply the replacement to specific nurmeric vectors (leaving say... strings with NA): df[19:28][is.na(df[19:28])] <- 0
– jtdoud
Feb 9 '17 at 18:03
...
How to get the name of a function in Go?
...lect"
"runtime"
)
func foo() {
}
func GetFunctionName(i interface{}) string {
return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
}
func main() {
// This will print "name: main.foo"
fmt.Println("name:", GetFunctionName(foo))
}
...
In Python, how do I create a string of n characters in one line of code?
I need to generate a string with n characters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters:
...
What is the difference between ApplicationContext and WebApplicationContext in Spring MVC?
...ationContext is an extension of the plain ApplicationContext that has some extra features necessary for web applications. It differs from a normal ApplicationContext in that it is capable of resolving themes (see Using themes), and that it knows which Servlet it is associated with (by having a link ...
How to check if a symlink exists
...
How about using readlink?
# if symlink, readlink returns not empty string (the symlink target)
# if string is not empty, test exits w/ 0 (normal)
#
# if non symlink, readlink returns empty string
# if string is empty, test exits w/ 1 (error)
simlink? () {
test "$(readlink "${1}")";
}
FILE...
How can you automatically remove trailing whitespace in vim
...
This will also delete trailing spaces in multi-line strings, which may not be desired in some cases. But I guess there is no easy way to avoid this?
– luator
Aug 11 '15 at 8:58
...
Getting key with maximum value in dictionary?
I have a dictionary : keys are strings, values are integers.
25 Answers
25
...
How can I efficiently download a large file using Go?
....
import (
"os"
"net/http"
"io"
)
func downloadFile(filepath string, url string) (err error) {
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Get the data
resp, err := http.Get(url)
if err != nil {
return ...
Pros and Cons of Interface constants [closed]
...s wouldn't include any constants or conditionals or magic-numbers or magic-strings or hard-coded anything. However, that adds additional time to the development, as you must consider the uses. My view is that most times it's absolutely worth taking the additional time to build a great solid design...
How to detect the OS from a Bash script?
...
From a quick glance, the backticks could resemble a string.
– Harrison Powers
Mar 31 '14 at 0:53
...