Stdin file number

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DietrichEpp: Ok, I see your point. The questioner needed to keep track of the lines. But do you see a simple way to get rid of the problem I've described above, though? Show 1 more comment. I would break the program in different tasks. Alok Singhal Alok Singhal I would do one of: fgetc to read individual characters and parse them yourself accumulate digits until you hit whitespace and you have an integer to convert with atoi ; if the whitespace is a newline, then it terminates a list of integers fgets to read a line at a time, and then parse the string again, look for whitespace separating the values that it returns.

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Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked Related In Python 2, this is rawinput prompt. It returns a file-like object like sys. In Python 2, this is io. Use like ''.

Both sys and fileinput must be imported, respectively, of course. Quick sys. TextIOWrapper instance Read at most n characters from stream. Read from underlying buffer until we have n characters or we hit EOF. If n is negative or omitted, read until EOF. The trailing newline is stripped. The prompt string, if given, is printed to standard output without a trailing newline before reading input.

If this works on your system, it will shave off more characters. The real use-case for fileinput is for reading in a series of files. Community Bot 1 1 1 silver badge. The answer proposed by others: for line in sys. Massimiliano Torromeo Massimiliano Torromeo 1, 1 1 gold badge 14 14 silver badges 17 17 bronze badges. The for line in sys. But if you test on very small files, responses may get buffered.

Test with more data to see that it reads intermediate results. I get wait for End Of File or buffering, when taking input from a stream when using python 2. Note print line does not woke in 3. Fine for stream processing. Not fine for line by line processing or user input. Sean: wrong. There is a read-ahead bug in Python 2 that delays the lines until the corresponding buffer is full.

It is a buffering issue that is unrelated to EOF. To workaround, use for line in iter sys. You don't need it in Python 3. Show 2 more comments. Simon Liu 1 1 gold badge 8 8 silver badges 22 22 bronze badges. WestCoastProjects Emil Lundberg Emil Lundberg 7, 6 6 gold badges 35 35 silver badges 51 51 bronze badges. ArgumentParser parser. Using stdin echo 'foo bar'. Using stdin through the special filename - echo 'foo bar'.

Here is an answer on what to do, if the input file is compressed: stackoverflow. Can simply rename to infile like the python argparse docs do: docs. Thank you tommy. Chandan Kumar Chandan Kumar 2, 2 2 gold badges 18 18 silver badges 19 19 bronze badges. I am pretty amazed no one had mentioned this hack so far: python -c "import sys; set map sys. Uri Goren Uri Goren Why use readlines that split into lines and then join again? You can just write print sys. This is will use more memory than needed because python needs to build an extra array.

Try this: import sys print sys. Bouba Bouba 5, 1 1 gold badge 18 18 silver badges 20 20 bronze badges. Tanveer Alam 4, 3 3 gold badges 19 19 silver badges 41 41 bronze badges. Wei Wei 4 4 silver badges 2 2 bronze badges. Bouni Bouni 6 6 silver badges 12 12 bronze badges. The problem I have with solution import sys for line in sys.

Tomas Tomecek Tomas Tomecek 5, 2 2 gold badges 26 26 silver badges 24 24 bronze badges. I'd seriously recommend hiding this hideous if condition into a method though. This method limits the applicability of the program seriously: for example, you cannot use this for interactive input from the terminal, because the input will almost never be "ready" when select is called; or you could also face problems if stdin is connected to a file on a slow medium network, CD, tape, etc.

You said that "if you don't pass any data to stdin, it will block forever. Next Difference between input and sys. Recommended Articles.

Generate two output strings depending upon occurrence of character in input string in Python. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Please use ide. Load Comments. What's New. Most popular in Python.