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If you want to prompt the user for input, you can use raw_input in Python 2.X, and just input in Python 3. If you actually just want to read command-line options, you can access them via the sys.argv list.
In fact, the program ONLY read the first line from the standard input, and discard the rest of them. It will be work if I take the place of sys.stdin.readline by sys.stdin.read() import sys print(len(sys.stdin.read())) However, it is obviously, that the program is NOT suitable for a large input. Please give me a elegant solution. Thank you!
According to me sys.stdin.read() method accepts a line as the input from the user until a special character like Enter Key and followed by Ctrl + D and then stores the input as the string. Control + D works as the stop signal. Example:
A more complete example (and hopefully more useful) would be to multiplex stdin data from user with incoming connections from network: import selectors. import socket. import sys. import os. import fcntl. m_selector = selectors.DefaultSelector() # set sys.stdin non-blocking. def set_input_nonblocking():
I learned some of the basics of Python and wanted to try easy challenges in Hackerrank. Input format: the first line contains integer; the second line contains the space separated list of integers; third line contains another integer. In the coding part, it says. Enter your code here. Read input from STDIN. Print output to STDOUT
else: inf = sys.stdin. At this point you would use inf to read from the file. Depending on whether a filename was given, this would read from the given file or from stdin. When you need to close the file, you can do this: if inf is not sys.stdin: inf.close() However, in most cases it will be harmless to close sys.stdin if you're done with it.
2. If you want to run code so that a file is read from stdin (instead of from an interactive terminal), then use redirection. python program.py <input_file.txt. The < means the named file will be attached to stdin when the script is run. This syntax is the same on Windows, MacOS, and Unix-like platforms. answered Feb 17, 2012 at 19:55.
How do I get the program to read lines from a redirected stdin via the command line? For instance: $ python graph.py < input.input. Here is the loop I have to read lines from input: while 1: line = sys.stdin.readline() if line == '\n': break. try:
You are passing a string to the bin() function: File "<stdin>", line 1, in <module>. Give it a integer instead: by turning the raw_input() result to int(): Tip: you can easily reverse a string by giving it a negative slice stride: so you can simplify your function to: n = int(raw_input()) bin_n = bin(n)[2:]
input_str = sys.stdin.read() According to the documentation: file.read([size]) Read at most size bytes from the file (less if the read hits EOF before obtaining size bytes). If the size argument is negative or omitted, read all data until EOF is reached. >>> import sys. >>> isinstance(sys.stdin, file) True. BTW, dont' use input as a variable name.