Question

当我尝试从命令行执行python程序时，它会出现以下错误。这些错误不会对我的输出造成任何问题。我不希望它显示在命令行

中

Traceback (most recent call last):
  File "test.py", line 88, in <module>
    p.feed(ht)
  File "/usr/lib/python2.5/HTMLParser.py", line 108, in feed
    self.goahead(0)
  File "/usr/lib/python2.5/HTMLParser.py", line 148, in goahead
    k = self.parse_starttag(i)
  File "/usr/lib/python2.5/HTMLParser.py", line 226, in parse_starttag
    endpos = self.check_for_whole_start_tag(i)
  File "/usr/lib/python2.5/HTMLParser.py", line 301, in check_for_whole_start_tag
    self.error("malformed start tag")
  File "/usr/lib/python2.5/HTMLParser.py", line 115, in error
    raise HTMLParseError(message, self.getpos())
HTMLParser.HTMLParseError: malformed start tag, at line 319, column 25

我怎样才能抑制错误？

Answer 1

将stderr重定向到/dev/null。

python somescript.py 2> /dev/null

Answer 2

不捕捉HTMLParseError对你有用吗？如果test.py是你的python文件的名称，它会传播到那里，所以它应该。

以下是如何抑制此类错误的示例。您可能需要调整一下以匹配您的代码。

try:
    # Put parsing code here
except HTMLParseError:
    pass

您也可以通过将stderr重定向为null来抑制错误消息，就像Ignacio建议的那样。要在代码中执行此操作，您只需编写以下内容：

import sys

class DevNull:
    def write(self, msg):
        pass

sys.stderr = DevNull()

但是，这可能不是您想要的，因为从您的错误看，脚本执行已停止，您可能希望继续执行。

Answer 3

在python 3中，@ Boo Yaniv的答案可以简化为

sys.stderr = object

因为python3中的每个类都是从Object继承的，所以从技术上来说这是可行的，至少我在python 3.6.5环境中自己尝试过。

Answer 4

这是一种更易读，简洁的解决方案，用于处理可以忽略的错误，而不必求助于典型的try / except / pass代码块。

library(shiny)
library(rhandsontable)
library(dplyr)
library(shinydashboard)

ui <-  fluidPage( fluidRow(column(6, uiOutput("selA"))),
                  fluidRow(column(6, rHandsontableOutput('tbl1'))
                  ) 
) 


server <- function(input, output, session){
  
  dt0 <- data.frame( A = c("S2","S2","S2","S4","S4","S4"),
                     B = c("1","2","3","1","2","3"),
                     C = c(10,20,30,40,15,25),
                     D  = c("A","B","C","D","E","F"))
  
  # get the data for the selected BA
  dt <- reactive(subset(dt0, A %in% input$selA))
  
  # Render selectInput selBA
  output$selA <- renderUI({
    ba <- as.vector( unique(dt0$A) )
    selectInput("selA","Choose BA", choices = ba)    
  })
  
  DF <- data.frame("X" = c(""),
                   "Y" = c(""),
                   "Z" = c(""),
                   "Type_action" = c(""))
  
  values <- reactiveValues(data = DF)
  Y      <- reactiveVal()
  Z      <- reactiveVal()
  
  observe({
    if(!is.null(input$tbl1)){
      values$data <- as.data.frame(hot_to_r(req(input$tbl1)))
    }
  })
  
  observeEvent(input$tbl1,{
    Y(hot_to_r(input$tbl1)$Y)},
    ignoreInit= TRUE
  )
  
  observeEvent(input$tbl1,{
    Z(hot_to_r(input$tbl1)$Z)}, 
    ignoreInit= TRUE
  )
  
  output$tbl1 = renderRHandsontable({
    req(input$selA)
    
    tmpTable <- rhandsontable(values$data, rowHeaders = FALSE, selectCallback = TRUE, width = 
                                1000, height = 500) %>% 
      hot_table(highlightCol = TRUE, highlightRow = TRUE, stretchH = "all") %>% 
      hot_col(col = "X", type = "dropdown", colWidths = 90, source = 
                sort(unique(dt()$B))) %>% 
      hot_col(col = "Y", type = "dropdown", colWidths = 65, source = 
                sort(unique(dt()$D))) %>% 
      hot_col(col = "Z", type = "dropdown", colWidths = 60,source = 
                sort(unique(dt()$D))) %>% 
      hot_col(col = "Type_action", colWidths = 50, readOnly = TRUE, type = "text")  
    
    
    if(!is.null(input$tbl1_select$select$r) && !is.na(values$data$Y[input$tbl1_select$select$r]) 
       && !is.na(values$data$Z[input$tbl1_select$select$r])){
      values$data$Type_action <- ifelse(match(Y(), LETTERS) < match(Z(), LETTERS),"Upgrade","Downgrade")
      
    }
    tmpTable
  })
}

shinyApp(ui, server)

Python：抑制转到命令行的错误？

4 个答案: