系统可能只有2.4.5或2.7.9的Python版本。我正在尝试编写一个批处理错误处理,首先尝试使用python 2.7.9,如果失败,使用python 2.4.5。
条件
系统已经安装了软件,只有Python2.4.5或Python2.7.9。我不知道是哪一个,所以我的脚本必须向后兼容。
,这就是我的
rem
@echo off
echo Building
"%COMMONPROGRAMFILES%\CompanyName\python\python27\python.exe" build.py
IF ERRORLEVEL 1 GOTO TRY-PYTHON-24
IF
我正在编写一个处理Python节点的代码,它应该与Python 2和Python 3兼容。
然而,Python3有ast.Try,Python2有ast.TryFinally和ast.TryExcept,所以我需要使用visit_别名来处理这两种情况。
如果我使用兼容性别名编写节点访问代码,如下面所示,我的预提交类型检查将在使用Python2时抱怨error: Name 'ast.Try' is not defined。
import ast
class Visitor(ast.NodeVisitor):
def visit_Try(self, node): #
我的操作系统:赢10,
安装:
Python2.7(命令为python)
Python3.9.5(命令为python3)
pip,pip3 (两者都用于python3,似乎)
pip命令:
c:\>pip3 config list -v
For variant 'global', will try loading 'C:\ProgramData\pip\pip.ini'
For variant 'user', will try loading 'C:\Users\luelue\pip\pip.ini'
F
有没有办法写一个从python2.4到python3兼容的异常捕获代码?
像这样的代码:
# only works in python 2.4 to 2.7
try:
pass
except Exception,e:
print(e)
# only works in python 2.6 to 3.3
try:
pass
except Exception as e:
print(e)
当我把Django应用程序推到Heroku时,我收到了这个警告
remote: -----> Python app detected
remote: ! The latest version of Python 3 is python-3.6.5 (you are using python-3.6.4, which is unsupported).
remote: ! We recommend upgrading by specifying the latest version (python-3.6.5).
remote: Learn More: ht
C:\Users\danie01\fox\test\robotframework>pipenv install
Installing dependencies from Pipfile.lock (49d163)...
An error occurred while installing robotframework-seleniumlibrary==3.1.0! Will try again.
An error occurred while installing selenium==3.9.0! Will try again.
An error occurred while insta
如何调整root窗口的大小?
try: # In order to be able to import tkinter for
import tkinter as tk # either in python 2 or in python 3
except ImportError:
import Tkinter as tk
root = tk.Tk()
tk.mainloop()
如何调整window的大小?
try: # In order to be able to impo
安装后,尝试在Mac上使用符号包运行Octave,我通过键入以下命令运行了一个测试(如上面的链接所示):
pkg load symbolic
syms x
但是,我在syms x中遇到了以下错误
octave:37> syms x
Symbolic pkg v2.9.0: sh: /usr/anaconda3/bin/python: No such file or directory
error: Cannot run the Python executable "/usr/anaconda3/bin/python"
Try "sympref dia
我正在从Python生成HTML页面。还有使用pexpect生成SSH会话并在相同的Python代码中获取命令输出的逻辑。但是当我从Apache httpd服务器运行Python时,它给出了500 internal server error。但是单独执行Python代码可以很好地工作。
不确定问题出在Python还是Apache中?
代码如下,我添加了用于调试的异常。异常显示
Exception seen in Web page :
Error! pty.fork() failed: out of pty devices name
'child' is not defined
我对python很陌生,我一直在想,您是否可以在python中这样做。
try:
something():
if it throws an exception then try this:
something1():
if it throws an exception again:
print(exception)
我创建了一个订单页面,客户可以查看他过去做过的所有订单,但由于我希望客户登录并查看订单,所以我创建了一个loginrequiredmixin。
mixins.py
from django.contrib.auth.decorators import login_required
from django.utils.decorators import method_decorator
from carts.models import Cart
from .models import Order
class LoginRequiredMixin(object):
@method_de
OS: Win10
环境: Visual代码
我想实现的目标:将pip从22.0.4更新到22.1
我想要的是:
python -m pip install -–upgrade pip
得到:
python : The term 'python' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name,
or if a path was included, verify that the path
我正在用终端测试我写在文件中的函数。我的系统是Ubuntu16.04和Python2.7。我发现,每次更改函数的内容,然后从终端再次执行,似乎没有应用这些更改。
我的实际目标是为Tensorflow计算设计函数和类,但就目前而言,它只是一个关于Python的问题。
我的意思是,首先在终端中输入python环境并导入文件,比如import try_function as trf,然后调用trf.try1() #suppose it prints 'hello world'。在我更改try1()使其打印'hello',从终端trf.try1()运行它之后,它仍然打印
在阅读了Python文档的之后,我想知道声明这个Python代码是否正确:
with EXPRESSION as TARGET:
SUITE
相当于这一项:
try:
manager = (EXPRESSION)
value = manager.__enter__()
TARGET = value # only if `as TARGET` is present in the with statement
SUITE
except:
import sys
if not manager.__exit__(*sys.exc_info()):
我在终端外壳上运行了以下代码:
>>> import Strat
>>> x=Strat.Try()
>>> x.do_something()
You can do anything here!!!(this is the output of do_something)
但同一文件在文件中调用时不起作用:
import Strat
class Strategy:
def gen_fibonacci(self,ind,n):
x=Strat.Try()
x.do_something()
我和PYKD一起工作,做垃圾堆分析。在heap_stat脚本中使用PYKD库,我希望以更交互式的方式使用PYKD库,如下所示:
Windbg prompt>!py
Input>dbgCommand("x /2 *!CStringArray*vftable*")
这很好(我知道这是没用的,我只是想证明它是有效的)。
但是,heap_stat脚本包含以下源代码:
try:
vftable_candidate = ptrPtr(ptr) # which pointer value is present on that spot in memory?
dprintl
我仍然不能想出如何分割一个“字符串”,然后在找到一些“字符串”后抓取整行。到目前为止,我是这样做的:
content.txt :
#Try to grab this line start
#Try to grab this line 1
#Try to grab this line 2
#Try to grab this line 3
#Try to grab this line 4
#Try to grab this line 5
#Try to grab this line 6
#Try to grab this line end
#Try to grab this line 7
#Try