大约有 6,400 项符合查询结果（耗时：0.0276秒） [XML]
Escaping regex string
...ort re
>>> re.escape('^a.*$')
'\\^a\\.\\*\\$'
If you are using a Python version < 3.7, this will escape non-alphanumerics that are not part of regular expression syntax as well.
If you are using a Python version < 3.7 but >= 3.3, this will escape non-alphanumerics that are not par...
Is there a difference between “raise exception()” and “raise exception” without parenthesis?
...can pass it arguments if needed).
The usual style that most people use in Python (i.e. in the standard library, in popular applications, and in many books) is to use raise MyException when there are no arguments. People only instantiate the exception directly when there some arguments need to be p...
RuntimeWarning: invalid value encountered in divide
...
Python indexing starts at 0 (rather than 1), so your assignment "r[1,:] = r0" defines the second (i.e. index 1) element of r and leaves the first (index 0) element as a pair of zeros. The first value of i in your for loop is ...
Storing Images in PostgreSQL
...detailed solution? Is there any other extension available? Multicorn needs python and I would prefer having to do without using Python..
– Jay Khatwani
Mar 18 '16 at 3:35
1
...
What is the difference between Google App Engine and Google Compute Engine?
...ally used. But the restriction is, you can create your application in only Python, PHP, Java, NodeJS, .NET, Ruby and **Go.
On the other hand, GCE provides you full infrastructure in the form of Virtual Machine. You have complete control over those VMs' environment and runtime as you can write or in...
Install NPM into home directory with distribution nodejs package (Ubuntu)
...
Because python does already a great job virtualenv, I use nodeenv. Compared to nvm, you can create multiple environments for the same node version (e.g. two environments for node 0.10 but with different sets of packages).
ENVNAME=de...
__init__ for unittest.TestCase
...en be used by some of the tests. I would use setUpClass, but I don't think python 2.4 supports it.
– ffledgling
Jun 27 '13 at 21:50
2
...
Why are dates calculated from January 1st, 1970?
...ard for time manipulation? I have seen this standard in Java as well as in Python. These two languages I am aware of. Are there other popular languages which follows the same standard?
...
What's the difference between subprocess Popen and call (how can I use them)?
I want to call an external program from Python. I have used both Popen() and call() to do that.
2 Answers
...
Having options in argparse with a dash
...
The relevant Python bug report: bugs.python.org/issue15125. argparse uses setattr and getattr, so dest names do not have to be valid dot attribute names. The user can also use getattr.
– hpaulj
Nov...