reslist$subjects[[1]] 中的 R 错误：下标越界

Question

想获取一些电影的评分，不知道如何解决"subscript out of bounds"的问题。这是我的代码。

movieScoreapi <- function(x) {
api <- "https://api.douban.com/v2/movie/search?q={"
url <- paste(api, x, "}", sep = "")    
res <- getURL(url)    
reslist <- fromJSON(res)    
name <- reslist$subjects[[1]]$title    
score <- reslist$subjects[[1]]$rating$average    
return(list(name = name, score = score))
}
movieScoreapi("Life is beautiful")

错误如下：

Error in reslist$subjects[[1]] : subscript out of bounds

Answer 1

1) 您使用了错误的端点。

2) 您构造的 URL 字符串不正确。通过将其复制粘贴到浏览器中查看它的输出：https://api.douban.com/v2/movie/search?q={Life%20Is%20Beautiful}

正确的端点是：获取 /v2/movie/subject/1764796

如果您想使用与现有端点相同的端点并获取其内容，请执行以下操作：

install.packages("httr")
require(httr)

movieScoreapi <- function(x) {
api <- "https://api.douban.com/v2/movie/search?q="
  url <- paste(api, x, sep = "")    
  res <- GET(url)    
  reslist <- content(res)    
  df_contents <- rbind(unlist(content(res)))
  return(df_contents)
}
movieScoreapi("Dracula") 
     count start total title                            
[1,] "20"  "0"   "0"   "搜索 \"LifeIsBeautiful\" 的结果"

reslist$subjects[[1]] 中的 R 错误：下标越界

R Error in reslist$subjects[[1]] : subscript out of bounds

r

subscript

rcurl