0x03. Log Parsing
Algorithm - Python - sys
What is stdin ?
stdin, stands for standard input,
It's part of the three standard streams used in computing, which also include standard output (stdout) and standard error (stderr). stdin is a stream from which a program reads its input data. It's typically connected to the keyboard, but can also be redirected to come from another source, like a file.
You can read from stdin using methods like readline() to read a single line, read() to read the specified number of characters, or readlines() to read all lines.
Here is a simple Python script demonstrating how to read a single line from stdin:
How to check if the input from stdin in Python matches a specific format:
-we need to use regex, we can use regex generator tools like : Regex generator tool
readline()Detect the end-of-file (EOF) from Stdin
To detect Ctrl + D in a Python script, you need to understand that Ctrl + D sends an EOF (End Of File) signal to the program. In the context of reading from stdin, this means that the input stream is closed.
How to capture every part in input that matches the regex pattern :
The group() method in Python's re module is used to return one or more subgroups of the match. If there is a single argument, the result is a single string; if there are multiple arguments, the result is a tuple with one item per argument. Without arguments, group1 defaults to zero (the whole match is returned).