StudioT::DevLog

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys

if __name__ == "__main__":
    all_lines=sys.stdin.readlines()
    for a_line in all_lines:
        str = a_line.split(None)
        if str[0] == "root":
            print(str[10:])

プロセスの引数も表示させるためにstr[10:]としているのですが、出力結果にリストの区切り記号も出力されてしまいます。

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys

if __name__ == "__main__":
    all_lines=sys.stdin.readlines()
    for line in all_lines:
        print(line, end='')

sys.stdin.readlines()で１行１要素としてリストで読み込みます。
print文のend=”は読み込んだ要素に改行が含まれているのでprint関数で改行を自動的に付与しないようにしています。

>>> import sys
>>> print(sys.__doc__)
>>> help(sys)
<!--more-->

例えば、sysのドキュメントを確認する場合は上記のように__doc__かhelpを使用します。
Python 3.2.2でsys.__doc__を出力した場合次のような説明が出力されます。(>>>が入力でそれ以外は出力結果です）

>>> print(sys.__doc__)
This module provides access to some objects used or maintained by the
interpreter and to functions that interact strongly with the interpreter.

Dynamic objects:

argv -- command line arguments; argv[0] is the script pathname if known
path -- module search path; path[0] is the script directory, else ''
modules -- dictionary of loaded modules

displayhook -- called to show results in an interactive session
excepthook -- called to handle any uncaught exception other than SystemExit
  To customize printing in an interactive session or to install a custom
  top-level exception handler, assign other functions to replace these.

stdin -- standard input file object; used by input()
stdout -- standard output file object; used by print()
stderr -- standard error object; used for error messages
  By assigning other file objects (or objects that behave like files)
  to these, it is possible to redirect all of the interpreter's I/O.

last_type -- type of last uncaught exception
last_value -- value of last uncaught exception
last_traceback -- traceback of last uncaught exception
  These three are only available in an interactive session after a
  traceback has been printed.

Static objects:

float_info -- a dict with information about the float implementation.
int_info -- a struct sequence with information about the int implementation.
maxsize -- the largest supported length of containers.
maxunicode -- the largest supported character
builtin_module_names -- tuple of module names built into this interpreter
subversion -- subversion information of the build as tuple
version -- the version of this interpreter as a string
version_info -- version information as a named tuple
hexversion -- version information encoded as a single integer
copyright -- copyright notice pertaining to this interpreter
platform -- platform identifier
executable -- pathname of this Python interpreter
prefix -- prefix used to find the Python library
exec_prefix -- prefix used to find the machine-specific Python library
float_repr_style -- string indicating the style of repr() output for floats
__stdin__ -- the original stdin; don't touch!
__stdout__ -- the original stdout; don't touch!
__stderr__ -- the original stderr; don't touch!
__displayhook__ -- the original displayhook; don't touch!
__excepthook__ -- the original excepthook; don't touch!

Functions:

displayhook() -- print an object to the screen, and save it in builtins._
excepthook() -- print an exception and its traceback to sys.stderr
exc_info() -- return thread-safe information about the current exception
exit() -- exit the interpreter by raising SystemExit
getdlopenflags() -- returns flags to be used for dlopen() calls
getprofile() -- get the global profiling function
getrefcount() -- return the reference count for an object (plus one :-)
getrecursionlimit() -- return the max recursion depth for the interpreter
getsizeof() -- return the size of an object in bytes
gettrace() -- get the global debug tracing function
setcheckinterval() -- control how often the interpreter checks for events
setdlopenflags() -- set the flags to be used for dlopen() calls
setprofile() -- set the global profiling function
setrecursionlimit() -- set the max recursion depth for the interpreter
settrace() -- set the global debug tracing function

さらに各項目ごとの詳細な説明を確認したい場合は次のように入力します。

>>> print(sys.exit.__doc__)
exit([status])

Exit the interpreter by raising SystemExit(status).
If the status is omitted or None, it defaults to zero (i.e., success).
If the status is numeric, it will be used as the system exit status.
If it is another kind of object, it will be printed and the system
exit status will be one (i.e., failure).

今年の目標の一つとして、pythonを実用レベル（C/C++のテストケースをpythonで書いた方が早く書けるレベル）まで習得しようと思います。

Read more of pythonの環境設定1