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python – What does sys.stdin read? – Stack Overflow

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• Summary of article content: Articles about python – What does sys.stdin read? – Stack Overflow Now, sys.stdin is just another file object, which happens to be opened by Python before your program starts. What you do with that file … …
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sys — System-specific parameters and functions — Python 3.10.5 documentation

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• Summary of article content: Articles about sys — System-specific parameters and functions — Python 3.10.5 documentation When an auditing event is raised through the sys.audit() function, … input and output codepages at startup, respectively for stdin and stdout/stderr. …
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How to Read from stdin in Python – JournalDev

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• Summary of article content: Articles about How to Read from stdin in Python – JournalDev Python sys module stdin is used by the interpreter for standard input. Internally, it calls the input() function. The input string is appended with a … …
• Most searched keywords: Whether you are looking for How to Read from stdin in Python – JournalDev Python sys module stdin is used by the interpreter for standard input. Internally, it calls the input() function. The input string is appended with a … There are three ways to read data from stdin in Python. sys.stdin input() built-in function fileinput.input() function 1. Using sys.stdin to read from
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Python Tutorial

1 Using sysstdin to read from standard input

2 Using input() function to read stdin data

3 Reading Standard Input using fileinput module

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sys.stdin.read Example

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How to Read from stdin in Python

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• Summary of article content: Articles about How to Read from stdin in Python The sys.stdin is another way is to read from the standard input the calls input() function internally. Python has another module named fileinput for reading … …
• Most searched keywords: Whether you are looking for How to Read from stdin in Python The sys.stdin is another way is to read from the standard input the calls input() function internally. Python has another module named fileinput for reading … Take input from the user is an important part of any programming language. The output of the many programs depends on the standard input. The way of taking input from the user is different for different programming languages. The input() function is the most common way is to read from the standard input, which is a built-in function. How to read from stdin in Python is explained in this article.
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Exampe-1 Read data from stdin by using input() function

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Example-2 Read data from stdin by using sysstdin

Output

Example-3 Read data from stdin by using fileinput

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Cách khắc phục lỗi ‘RuntimeError: input (): lost sys.stdin’ trong python 3.7

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• Summary of article content: Articles about Cách khắc phục lỗi ‘RuntimeError: input (): lost sys.stdin’ trong python 3.7 Ví dụ: bảng điều khiển QGIS Python không có stdin hoặc stdout, vì vậy bạn sẽ gặp lỗi ‘RuntimeError: input (): lost sys.stdin’ nếu chạy mã của bạn ở đó. Xem bài … …
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What is the difference between input() and sys.stdin in Python? – Quora

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• Summary of article content: Articles about What is the difference between input() and sys.stdin in Python? – Quora sys.stdin on the other hand is a File Object. It is like creating any other file object one could create to read input from the file. In this case, the file … …
• Most searched keywords: Whether you are looking for What is the difference between input() and sys.stdin in Python? – Quora sys.stdin on the other hand is a File Object. It is like creating any other file object one could create to read input from the file. In this case, the file … input() prompts the user to enter an input. It is implemented in Python 3 and you cannot use it in Python 2 (throws a syntax error). Instead of just reading the input, it even tries to evaluate the read input to appropriate datatype. So the read i…
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What does sys.stdin read?

So you have used Python’s “pre built in functions”, presumably like this:

file_object = open(‘filename’) for something in file_object: some stuff here

This reads the file by invoking an iterator on the file object which happens to return the next line from the file.

You could instead use:

file_object = open(‘filename’) lines = file_object.readlines()

which reads the lines from the current file position into a list.

Now, sys.stdin is just another file object, which happens to be opened by Python before your program starts. What you do with that file object is up to you, but it is not really any different to any other file object, its just that you don’t need an open .

for something in sys.stdin: some stuff here

will iterate through standard input until end-of-file is reached. And so will this:

lines = sys.stdin.readlines()

Your first question is really about different ways of using a file object.

Second, where is it reading from? It is reading from file descriptor 0 (zero). On Windows it is file handle 0 (zero). File descriptor/handle 0 is connected to the console or tty by default, so in effect it is reading from the keyboard. However it can be redirected, often by a shell (like bash or cmd.exe) using syntax like this:

myprog.py < input_file.txt

sys — System-specific parameters and functions — Python 3.10.5 documentation

Append the callable hook to the list of active auditing hooks for the current (sub)interpreter.

When an auditing event is raised through the sys.audit() function, each hook will be called in the order it was added with the event name and the tuple of arguments. Native hooks added by PySys_AddAuditHook() are called first, followed by hooks added in the current (sub)interpreter. Hooks can then log the event, raise an exception to abort the operation, or terminate the process entirely.

Calling sys.addaudithook() will itself raise an auditing event named sys.addaudithook with no arguments. If any existing hooks raise an exception derived from RuntimeError , the new hook will not be added and the exception suppressed. As a result, callers cannot assume that their hook has been added unless they control all existing hooks.

See the audit events table for all events raised by CPython, and PEP 578 for the original design discussion.

New in version 3.8.

Changed in version 3.8.1: Exceptions derived from Exception but not RuntimeError are no longer suppressed.

How to Read from stdin in Python

There are three ways to read data from stdin in Python.

sys.stdin input() built-in function fileinput.input() function

1. Using sys.stdin to read from standard input

Python sys module stdin is used by the interpreter for standard input. Internally, it calls the input() function. The input string is appended with a newline character (

) in the end. So, you can use the rstrip() function to remove it.

Here is a simple program to read user messages from the standard input and process it. The program will terminate when the user enters “Exit” message.

import sys for line in sys.stdin: if ‘Exit’ == line.rstrip(): break print(f’Processing Message from sys.stdin *****{line}*****’) print(“Done”)

Output:

Hi Processing Message from sys.stdin *****Hi ***** Hello Processing Message from sys.stdin *****Hello ***** Exit Done

Notice the use of rstrip() to remove the trailing newline character so that we can check if the user has entered “Exit” message or not.

2. Using input() function to read stdin data

We can also use Python input() function to read the standard input data. We can also prompt a message to the user.

Here is a simple example to read and process the standard input message in the infinite loop, unless the user enters the Exit message.

while True: data = input(“Please enter the message:

“) if ‘Exit’ == data: break print(f’Processing Message from input() *****{data}*****’) print(“Done”)

Output:

The input() function doesn’t append newline character to the user message.

3. Reading Standard Input using fileinput module

We can also use fileinput.input() function to read from the standard input. The fileinput module provides utility functions to loop over standard input or a list of files. When we don’t provide any argument to the input() function, it reads arguments from the standard input.

This function works in the same way as sys.stdin and adds a newline character to the end of the user-entered data.

import fileinput for fileinput_line in fileinput.input(): if ‘Exit’ == fileinput_line.rstrip(): break print(f’Processing Message from fileinput.input() *****{fileinput_line}*****’) print(“Done”)

Output:

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