How to unread a single char in Python?

Question

I need to read a single char from stdin and then unread it so that the next time an input method is called, that char should be included in the result. In C++, cin.putback does this. What is the equivalent in Python?

Please note that I don't need to intermingle different input methods/functions.

Possible duplicate of [How can I simulate input to stdin for pyunit?](http://stackoverflow.com/questions/6271947/how-can-i-simulate-input-to-stdin-for-pyunit) — Torxed, Jan 20 '17 at 12:00

wildwilhelm · Answer 1 · 2017-01-20T13:47:27.323

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In Python 3, sys.stdin has a property called buffer that is an instance of io.BufferedReader and so has a peek method. This should allow you to do sys.stdin.buffer.peek(1)[:1], which would let you look at the next character in standard input without reading (consuming) it.

edited Jan 20 '17 at 13:47

answered Jan 20 '17 at 12:21

wildwilhelm

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Thanks. Anything similar for Python 2? – Abhishek Kumar Jan 22 '17 at 11:38

score 0 · Answer 2 · answered Jan 20 '17 at 12:05

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There isn't a simple analogue in Python.

Your best bet is probably to read the characters into an list in your program, and then later consume them from that list.

answered Jan 20 '17 at 12:05

Katriel

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That will get dirty very soon unless I write some module doing it for me. – Abhishek Kumar Jan 22 '17 at 11:37

score 0 · Accepted Answer · answered Jan 21 '17 at 08:14

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I found a Python module called CIn which does exactly what I want. It is available on GitHub: https://github.com/abhishekkr200802/CIn

answered Jan 21 '17 at 08:14

Abhishek Kumar

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How to unread a single char in Python?

3 Answers3