大约有 40,000 项符合查询结果（耗时：0.0308秒） [XML]
浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...1460，所以「cwnd」的初始值是3MSS。
当我们浏览视频或者下载软件的时候，「cwnd」初始值的影响并不明显，这是因为传输的数据量比较大，时间比较长，相比之下，即便慢启动阶段「cwnd」初始值比较小，也会在相对很短的时间...
苹果全球开发者大会：无硬件 iOS 9等三大系统更新 - 资讯 - 清泛网 - 专注C...
...设备的发布正式推出，而面向非开发者的beta版在7月就能下载体验。
苹果在iPad的iOS 9中加入了分屏多任务功能。该功能主要分为三项：SlideOver、Split View和画中画。
为了实现SlideOver，苹果重新设计了双击Home键后出现的任务管理...
Empty set literal?
...
Why?! Performance is almost identical: $ python3.7 -m timeit 'set()' 2000000 loops, best of 5: 177 nsec per loop $ python3.7 -m timeit '{*()}' 2000000 loops, best of 5: 171 nsec per loop
– ogurets
Mar 31 '19 at 23:1...
Installing PIL with pip
...l Pillow
If you have both Pythons installed and want to install this for Python3:
python3 -m pip install Pillow
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...
Returning the product of a list
...l
import numpy as np
import numexpr as ne
# from functools import reduce # python3 compatibility
a = range(1, 101)
%timeit reduce(lambda x, y: x * y, a) # (1)
%timeit reduce(mul, a) # (2)
%timeit np.prod(a) # (3)
%timeit ne.evaluate("prod(a)") # (4)
...
Python Anaconda - How to Safely Uninstall
...directory with rm -rf ~/.condarc ~/.conda ~/.continuum.
Further notes:
Python3 installs may use a ~/anaconda3 dir instead of ~/anaconda.
You might also have a ~/.anaconda hidden directory that may be removed.
Depending on how you installed, it is possible that the PATH is modified in one of your...
How do I run Python code from Sublime Text 2?
...
If using python 3.x you need to edit the Python3.sublime-build
(Preferences > Browse packages > Python 3)
to look like this:
{
"path": "/usr/local/bin",
"cmd": ["python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"sele...
How do I get a list of column names from a psycopg2 cursor?
...query, you can query the information_schema.columns table.
#!/usr/bin/env python3
import psycopg2
if __name__ == '__main__':
DSN = 'host=YOUR_DATABASE_HOST port=YOUR_DATABASE_PORT dbname=YOUR_DATABASE_NAME user=YOUR_DATABASE_USER'
column_names = []
with psycopg2.connect(DSN) as connection...
How do you do a simple “chmod +x” from within python?
...
Here is a version that simulates that behavior exactly:
#!/usr/bin/env python3
import os
import stat
def get_umask():
umask = os.umask(0)
os.umask(umask)
return umask
def chmod_plus_x(path):
os.chmod(
path,
os.stat(path).st_mode |
(
(
...
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need
... and I had the same original error in this post. After I ran the command:
python3 -m pip install lxml
it resolved my problem
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