英文:
How to do interpolation on URL in Golang
问题
我有以下URL，并且我想要在每次迭代中更改start的值。有没有更好的方法来做到这一点？
test := "https://www.googleapis.com/customsearch/v1?start=%d&cx=001106611627702700888%3Aaonktv-oz_w&q=bells%20palsy%20mouth&exactTerms=palsy&fileType=png&imgColorType=color&imgType=face&searchType=image&key=AIzaSyAYqQ4IxUHnF7rfvzSvnczxQ-u93AbkC8k"
for v := 1; v < 100; v += 10 {
val := fmt.Sprintf(test, v)
fmt.Println(val)
}
当前输出为：
https://www.googleapis.com/customsearch/v1?start=1&cx=001106611627702700888%!A(MISSING)aonktv-oz_w&q=bells%!p(MISSING)alsy%!m(MISSING)outh&exactTerms=palsy&fileType=png&imgColorType=color&imgType=face&searchType=image&key=AIzaSyAYqQ4IxUHnF7rfvzSvnczxQ-u93AbkC8k
预期输出应为：
https://www.googleapis.com/customsearch/v1?startindex=1&q=bells%20palsy%20mouth
https://www.googleapis.com/customsearch/v1?startindex=11&q=bells%20palsy%20mouth
为什么Sprintf给我返回(MISSING)和一些随机字符？
英文:
I have the follow URL and I want to change the value of start for each iteration. Is there a better way to do it?
test := "https://www.googleapis.com/customsearch/v1?start=%d&cx=001106611627702700888%3Aaonktv-oz_w&q=bells%20palsy%20mouth&exactTerms=palsy&fileType=png&imgColorType=color&imgType=face&searchType=image&key=AIzaSyAYqQ4IxUHnF7rfvzSvnczxQ-u93AbkC8k"
for v := 1; v < 100; v += 10 {
val := fmt.Sprintf(test, v)
fmt.Println(val)
}
Output now:
https://www.googleapis.com/customsearch/v1?start=1&cx=001106611627702700888%!A(MISSING)aonktv-oz_w&q=bells%!p(MISSING)alsy%!m(MISSING)outh&exactTerms=palsy&fileType=png&imgColorType=color&imgType=face&searchType=image&key=AIzaSyAYqQ4IxUHnF7rfvzSvnczxQ-u93AbkC8k
Expected Output should be:
https://www.googleapis.com/customsearch/v1?startindex=1&q=bells%20palsy%20mouth
https://www.googleapis.com/customsearch/v1?startindex=11&q=bells%20palsy%20mouth
....etc.
Why Sprintf gives me (MISSING) and a couple of random characters?
答案1
得分: 3
非格式化动词的%字符应该被转义为%%：
test := "https://www.googleapis.com/customsearch/v1?start=%d&cx=001106611627702700888%%3Aaonktv-oz_w&q=bells%%20palsy%%20mouth&exactTerms=palsy&fileType=png&imgColorType=color&imgType=face&searchType=image&key=AIzaSyAYqQ4IxUHnF7rfvzSvnczxQ-u93AbkC8k"
如果%没有被转义，那么fmt期望找到相应的参数，并在找不到参数时输出(MISSING)。
英文:
The % characters that are not part of a format verb should be escaped as %%:
test := "https://www.googleapis.com/customsearch/v1?start=%d&cx=001106611627702700888%%3Aaonktv-oz_w&q=bells%%20palsy%%20mouth&exactTerms=palsy&fileType=png&imgColorType=color&imgType=face&searchType=image&key=AIzaSyAYqQ4IxUHnF7rfvzSvnczxQ-u93AbkC8k"
If the % are not escaped, then fmt expects to find a corresponding argument and complains with the output (MISSING) when the argument is not found.
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