read from stdin python
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Certainly! Reading from stdin (standard input) in Python is a common task, especially when dealing with command-line interfaces or accepting user input. The sys and input modules are often used for this purpose. Here's a simple tutorial with code examples:
The input() function in Python allows you to read a line from stdin.
In this example, the input() function takes a prompt as an argument (optional) and waits for the user to enter something. The entered value is then stored in the variable user_input.
The sys module provides a more flexible way to read from stdin, especially when you need to read multiple lines.
In this example, the sys.stdin.readline() function is used to read lines from stdin. The strip() method is used to remove leading and trailing whitespaces, and the loop continues until an empty line is encountered (when the user presses Ctrl+D).
When you need to read numerical input, you should convert the input to the desired numeric type.
In this example, the int() function is used to convert the input to an integer. The ValueError exception is caught in case the input is not a valid integer.
Another approach is to use sys.stdin directly.
In this example, the program iterates over each line from sys.stdin. The strip() method is used to remove leading and trailing whitespaces.
Reading from stdin in Python is a straightforward process, and you can choose the method that best fits your use case. The examples provided cover basic scenarios for reading input from the user or other sources.
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