And write to stdout . This is done via stdout and stderr. Is identical to'putc(c, stdout )'. To write to stdout :.
Stdout , and instances of io. StringIO.如果stream为None,则使用sys.stdout 。 If stream is None, sys. stdout is used. Exits before all buffered data in stdout was read. 我当时紧张得忘了,其实0就是stdin,1是stdout ,2是stderr。 Zero is always stdin, 1 is stdout , 2 is stderr. Stdout stream, making the script output the result right away.如果参数不存在或为None,则将使用sys.stdout 。 If it's not present or None, sys. stdout will likely be used. Stdout 对象里面,这个对象是python里面的标准输出的实现。Stdout object, which is how standard output is implemented in Python. 例如,一个对HTTP服务器的请求是一个流,可以是stdout 。 For example a request to an HTTP server is a stream, as is stdout . O,--outputFILE将输出写入文件,而非stdout . O writes the profile results to a file instead of to stdout . Stdout :这指作为标准输出,关联文件描述符为1。Stdout : This is referred to as standard output and associated file descriptor is 1. 比如对一个HTTP服务器的请求是一个流,process.stdout 也是一个流。 For example a request to an HTTP server is a stream, as is stdout . 执行单元程序使用stdin/stdout 使用HTTP或gRPCAPI. Unit of execution program using stdin/ stdout service with HTTP or gRPC API. Stdout :这被称为作为标准输出和1相关的文件描述符。Stdout : This is referred to as standard output and associated file descriptor is 1. 在这种情况下,1是一个文件描述符,指向标准输出(stdout )。 And that 1, in this context, is a file descriptor that points to the standard output(stdout ). 这样想:当Bash到达2gt;&1时,stdout (1)仍然是指向终端的通道。 Think about it like this: when Bash gets to 2>1, stdout (1) is still a channel that points to the terminal. Returncode中,打印到stdout 的输出可以在属性output.stdout 中找到。 Returncode, and the output printed to stdout can be found in the attribute output. stdout . 然后在命令结束时,Bash看到你要打开stdout (1)作为到services.txt文件的通道。 Then at the end of the command, Bash sees you want to open stdout as a channel to the services. txt file. 此代码将提示用户输入一个值,将被存储在一个变量val,最后将打印在STDOUT . This code will prompt the user to enter a value, which will be stored in a variable val and finally will be printed on STDOUT . 注:0是标准输入(STDIN),1是标准输出(STDOUT ),2是标准错误输出(STDERR). File descriptor 0 is standard input(stdin), 1 is standard output(stdout ), and 2 is standard error(stderr). 此代码将提示用户输入一个值,将被存储在一个变量val,最后将打印在STDOUT . The code will prompt the user to enter a value that will be stored in the variable val and will eventually be printed on STDOUT . 还需要注意的是stdio流(stdin,stdout ,stderr)在子进程中有着与父进程中相反的类型。 Also note how the stdio streams(stdin, stdout , stderr) have the inverse stream types when it comes to child processes. 第一种并且原始的方法是一旦你检测到前台程序(例如shell)已经退出就直接关闭stdout 。 The first, and naive approach is obviously to simply close stdout as soon as you detect that the foreground program(e.g. the shell) has exited. 与正常进程不同的是,在子进程中,stdout /stderr流是可读流,而stdin流是可写的。 Unlike in a normal process though, in a child process, the stdout /stderr streams are readable streams while the stdin stream is a writable one.
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