EOFError when using input() after using sys.stdin.buffer.read()

Question

I'm currently writing a python program on linux which will accept a binary stream via sys.stdin.buffer.read(), and then I'd like it to accept input interactively afterward using input().

Here is a completely contrived example which illustrates my issue:

#!/usr/bin/env python3
import sys 

buf = b"Garbage Data"
#comment out the following line to avoid the EOFError:
buf = sys.stdin.buffer.read()

with open("outTempFile", 'wb') as f:
    f.write(buf)

print("Please enter your name:")
buf2 = input("First:\t")
print("Your first name is:\t{}".format(buf2))

When I run this program with a stdin input, I get the following error/output:

-> % cat contrivedExample.py | ./contrivedExample.py Please enter your name: First: Traceback (most recent call last): File "./contrivedExample.py", line 11, in <module> buf2 = input("First:\t") EOFError: EOF when reading a line

The output file, outTempFile does get written to, however the call to input() fails with the EOFError. I'm guessing this is because STDIN is tied to the pipe I used in the command-line invocation of the script.

When I comment out line #6 and run the program with the same invocation:

-> % cat contrivedExample.py | ./contrivedExample.py

I get the following output:

Please enter your name: First: Your first name is: #!/usr/bin/env python3

Which tells me that input() is indeed reading STDIN from the pipe (|) provided on the command line.

My question is how I can switch the program from reading in via the pipe (|) to reading in via interactive terminal prompt (as is usually done via input())?

I finally found the answer in this thread: stackoverflow.com/questions/8034595/… — TobalJackson
– TobalJackson, Commented Oct 27, 2016 at 15:19

TobalJackson · Accepted Answer · 2016-10-27 15:21:01Z

1

The solution I found is after reading from STDIN via a linux pipe (|) to simply replace sys.stdin with open('/dev/tty') which allows input() to read from my terminal:

echo "hello" | python -c 'import sys; buf = sys.stdin.read(); print(buf); sys.stdin=open("/dev/tty"); buf2=input(); print(buf2)'

answered Oct 27, 2016 at 15:21

TobalJackson

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