pythonexit退出

① python exit() 怎么用

exit可能被site自定义文件改了，你打印一下exit的值，应该变成字符串了。需要咨询系统管理员。

正常的site文件exit是这样的：

$python
Python2.7.10(default,Aug132015,17:53:56)
[GCC4.7.2]onlinux2
Type"help","right","credits"or"license"formoreinformation.
>>>exit.__mole__
'site'
>>>importsite
>>>site.__file__
'/home/sylecn/opt/lib/python2.7/site.pyc'
>>>printexit
Useexit()orCtrl-D(i.e.EOF)toexit
>>>printtype(exit)
<class'site.Quitter'>
>>>

这是原版的site.py exit的定义：

defsetquit():
"""Definenewbuiltins'quit'and'exit'.

.
.

"""
ifos.sep==':':
eof='Cmd-Q'
elifos.sep=='\':
eof='Ctrl-ZplusReturn'
else:
eof='Ctrl-D(i.e.EOF)'

classQuitter(object):
def__init__(self,name):
self.name=name
def__repr__(self):
return'Use%s()or%stoexit'%(self.name,eof)
def__call__(self,code=None):
#,butlistenwhentheir
#stdinwrapperisclosed.
try:
sys.stdin.close()
except:
pass
raiseSystemExit(code)
__builtin__.quit=Quitter('quit')
__builtin__.exit=Quitter('exit')

② python输入exit（）后为什么直接退出了

打开的不是同一个程序，
第一张图是cmd命令提示符。
第二张图是IDLE。
自然效果不一样

③ python 中的exit()怎么用

是sys模块中的exit函数吗？
sys.exit() 引发一个 SystemExit异常，若没有捕获这个异常，Python解释器会直接退出；捕获这个异常可以做一些额外的清理工作。0为正常退出，其他数值（1-127）为不正常，可抛异常事件供捕获。
exit() 跟 C 语言等其他语言的 exit() 应该是一样的。
如果是你手动调用这个函数就是要自己处理异常的情况。

④ 在linux的终端怎么退出python命令行

Python2.7.7(default,Jun32014,01:46:20)
[GCC4.9.020140521(prerelease)]onlinux2
Type"help","right","credits"or"license"formoreinformation.
>>>quit
Usequit()orCtrl-D(i.e.EOF)toexit
>>>

使用 quit(), exit(), 或者Ctrl-D退出命令行。

如果解决了您的问题请采纳！
如果未解决请继续追问！

⑤ 请教Python如何终止主程序

return break 都可以终止函数的运行

exit(0) # 无错误退出
exit(1) # 有错误退出
这两条语句一般都会加在程序的最后 因为exit是迫使系统去终止程序的运行！

⑥ Python退出命令的总结

@(Python入门)

[TOC]

quit raises the SystemExit exception behind the scenes.
Furthermore, if you print it, it will give a message:

This functionality was included to help people who do not know Python. After all, one of the most likely things a newbie will try to exit Python is typing in quit .

Nevertheless, quit should not be used in proction code. This is because it only works if the site mole is loaded. Instead, this function should only be used in the interpreter.

exit is an alias for quit (or vice-versa). They exist together simply to make Python more user-friendly.
Furthermore, it too gives a message when printed:

However, like quit , exit is considered bad to use in proction code and should be reserved for use in the interpreter. This is because it too relies on the site mole.

sys.exit raises the SystemExit exception in the background. This means that it is the same as quit and exit in that respect.
Unlike those two however, sys.exit is considered good to use in proction code. This is because the sys mole will always be there.

os._exit exits the program without calling cleanup handlers, flushing stdio buffers, etc . Thus, it is not a standard way to exit and should only be used in special cases. The most common of these is in the child process(es) created by os.fork .

Ctrl+Z is a qucik-operation of exit and quit , which means Ctrl+Z is the same with them.

use

to exit, so u don't need to import sys first.

The site mole (which is imported automatically ring startup, except if the -S command-line option is given) adds several constants to the built-in namespace. They are useful for the interactive interpreter shell and should not be used in programs.

Objects that when printed, print a message like “Use quit() or Ctrl-D (i.e. EOF, end of file) to exit”, and when called, raise SystemExit with the specified exit code.

Exit from Python. This is implemented by raising the SystemExit exception, so cleanup actions specified by finally clauses of try statements are honored, and it is possible to intercept the exit attempt at an outer level.

The optional argument arg can be an integer giving the exit status (defaulting to zero), or another type of object. If it is an integer, zero is considered “successful termination” and any nonzero value is considered “abnormal termination（结局）” by shells and the like. Most systems require it to be in the range 0–127, and proce undefined results otherwise. Some systems have a convention for assigning specific meanings to specific exit codes, but these are generally underdeveloped; Unix programs generally use 2 for command line syntax errors and 1 for all other kind of errors. If another type of object is passed, None is equivalent to passing zero, and any other object is printed to stderr and results in an exit code of 1. In particular, sys.exit ( "some error message" ) is a quick way to exit a program when an error occurs.

Since exit() ultimately “only” raises an exception, it will only exit the process when called from the main thread, and the exception is not intercepted.

Changed in version 3.6: If an error occurs in the cleanup after the Python interpreter has caught SystemExit (such as an error flushing buffered data in the standard streams), the exit status is changed to 120.

https://stackoverflow.com/questions/19747371/python-exit-commands-why-so-many-and-when-should-each-be-used

https://docs.python.org/3/library/constants.html#quit

https://docs.python.org/3/library/sys.html#sys.exit

http://grokbase.com/t/python/python-list/042qh9j55e/gripe-use-ctrl-d-i-e-eof-to-exit

⑦ python如何在终端退出

有时为了方便经常会在命令行敲python代码，但是用了不记得怎么退出了，只能关闭窗口，
退出方法：在>>>后面 输入 exit()就行了
cmd中如何退出Python
(1)在命令行上输入exit()
(2)在命令行上输入quit()
推荐学习《python教程》
好像还有一种方法是在命令行上输入Ctrl+Z，
除此之外，还可以使用
quit() 回车
control+z 回车
注意上面exit和quit后面都有括号（）。

⑧ python如何用户直接输入“exit”这个字符串退出 新手急急急

在循环获取键盘输入的时候加入判断，如果输入字符为exit，那么跳出循环，跳出程序
希望我的回答对你有帮助~

⑨ cmd下如何退出python

进入：

直接输入python即可，

相关推荐：《Python入门教程》

退出：

1：输入exit()，回车

2：输入quit()，回车

3：输入ctrl+z，回车