大约有 9,000 项符合查询结果（耗时：0.0324秒） [XML]
What are metaclasses in Python?
In Python, what are metaclasses and what do we use them for?
22 Answers
22
...
Add params to given URL in Python
...:
try:
import urlparse
from urllib import urlencode
except: # For Python 3
import urllib.parse as urlparse
from urllib.parse import urlencode
url = "http://stackoverflow.com/search?q=question"
params = {'lang':'en','tag':'python'}
url_parts = list(urlparse.urlparse(url))
query = d...
Use 'import module' or 'from module import'?
...est to use import module or from module import . I've just started with Python and I'm trying to start off with best practices in mind.
...
How can I check the syntax of Python script without executing it?
...hen exit without executing it. Is there an equivalent way to do this for a Python script?
8 Answers
...
Immutable vs Mutable types
...st, but not exactly. Technically, all variables are passed by reference in Python, but have a semantics more like pass by value in C. A counterexample to your analogy is if you do def f(my_list): my_list = [1, 2, 3]. With pass-by-reference in C, the value of the argument could change by calling that...
List comprehension rebinds names even after scope of comprehension. Is this right?
...
List comprehensions leak the loop control variable in Python 2 but not in Python 3. Here's Guido van Rossum (creator of Python) explaining the history behind this:
We also made another change in Python
3, to improve equivalence between list
comprehensions and generator
...
华为公司的新产品研发流程管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...了捷报：华为将为荷兰移动通信运营商telfort建设第三代网络。这是华为的首份欧洲合同。对于这桩价值数亿欧元的交易，用华为总裁任正非的话来说，“在华为成为全球规模的移动解决方案供应商的道路上，这是向前迈出的一...
Import Error: No module named numpy
... to this question , but still one step behind. I have only one version of Python 3 installed on my Windows 7 ( sorry ) 64-bit system.
...
Behaviour of increment and decrement operators in Python
...optimize their code is usually frowned upon, especially in a language like Python that is designed to be consistent and readable.
Confusing side-effects. One common newbie error in languages with ++ operators is mixing up the differences (both in precedence and in return value) between the pre- and ...
How to convert a string to utf-8 in Python
I have a browser which sends utf-8 characters to my Python server, but when I retrieve it from the query string, the encoding that Python returns is ASCII. How can I convert the plain string to utf-8?
...