In python, how to check the end of standard input streams (sys.stdin) and do something special on that

问题

I want to do something like:

for line in sys.stdin:
    do_something()
    if is **END OF StdIn**:
        do_something_special()

After a few tries, for now I am doing this:

while True:
    try:
        line = sys.stdin.next()
        print line,
    except StopIteration:
        print 'EOF!'
        break

Or with this:

while True:
    line = sys.stdin.readline()
    if not line:
        print 'EOF!'
        break
    print line,

I think both above ways are very similar. I want to know is there a more elegant (pythonic) way to do this?

---

Early failed tries:

I first tried to catch the StopIteration from inside or outside of a for loop, but I soon realize that since the StopIteration exception is build into for loop itself, both following code snippet didn't work.

try:
    for line in sys.stdin:
        print line,
except StopIteration:
    print 'EOF'

or

for line in sys.stdin:
    try:
        print line,
    except StopIteration:
        print 'EOF'

回答1:

for line in sys.stdin:
    do_whatever()
# End of stream!
do_whatever_else()

It's that simple.

回答2:

Use try/except. Input

When EOF is read, EOFError is raised.

while True:
    try:
        s=input("> ")
    except EOFError:
        print("EOF")
        break

来源：https://stackoverflow.com/questions/24089090/in-python-how-to-check-the-end-of-standard-input-streams-sys-stdin-and-do-som