在python中，如何检查标准输入流（sys.stdin）的结尾并对此做一些特殊的事情

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

提问by YaOzI

I want to do something like:

我想做类似的事情：

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:

经过几次尝试，现在我正在这样做：

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

Or with this:

或者用这个：

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?

我认为上述两种方式都非常相似。我想知道有没有更优雅（pythonic）的方法来做到这一点？

---

---

Early failed tries:

早期失败的尝试：

I first tried to catch the StopIterationfrom inside or outside of a forloop, but I soon realize that since the StopIterationexception is build intoforloop itself, both following code snippet didn't work.

我首先尝试StopIteration从for循环内部或外部捕获，但我很快意识到，由于StopIteration异常已构建到for循环本身中，因此以下代码段均无效。

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

or

或者

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

采纳答案by user2357112 supports Monica

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

It's that simple.

就这么简单。

回答by KIM Taegyoon

Use try/except. Input

使用尝试/除外。输入

When EOF is read, EOFError is raised.

读取 EOF 时，会引发 EOFError。

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