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iOS开发过程中的各种tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...直接在介绍AFNetworking的时候详解吧。
25.使用NSURLConnection下载数据
1. 创建对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];
[NSURLConnection connectionWithRequest:request delegate:self];
2. NSURLCon...
Flattening a shallow list in Python [duplicate]
...
@JosepVallsm nice solution! for python3 you need to use str instead of basestring, The builtin basestring abstract type was removed. Use str instead. The str and bytes types don’t have functionality enough in common to warrant a shared base class. The 2to...
Select random lines from a file
...s what I regularly use so that's what I'll use to make this faster:
#!/bin/python3
import random
f = open("lines_78000000000.txt", "rt")
count = 0
while 1:
buffer = f.read(65536)
if not buffer: break
count += buffer.count('\n')
for i in range(10):
f.readline(random.randint(1, count))
This...
How to re-raise an exception in nested try/except blocks?
...
@user4815162342 Good point :) Though meanwhile in Python3 I'd consider raise from, so the stack trace would also let me se plan B failed. Which can be emulated in Python 2 by the way.
– Tobias Kienzler
Feb 4 '17 at 21:30
...
How to convert an xml string to a dictionary?
...ing from a JSON/dict, you can use:
try:
basestring
except NameError: # python3
basestring = str
def dict_to_etree(d):
def _to_etree(d, root):
if not d:
pass
elif isinstance(d, basestring):
root.text = d
elif isinstance(d, dict):
...
Multiprocessing vs Threading Python [duplicate]
...other Python inefficiencies coming into play.
Test code:
#!/usr/bin/env python3
import multiprocessing
import threading
import time
import sys
def cpu_func(result, niters):
'''
A useless CPU bound function.
'''
for i in range(niters):
result = (result * result * i + 2 * ...
`from … import` vs `import .` [duplicate]
...
You are using Python3 were urllib in the package. Both forms are acceptable and no one form of import is preferred over the other. Sometimes when there are multiple package directories involved you may to use the former from x.y.z.a import...
logger configuration to log to file and print to stdout
...output and is easily configurable (also available as Gist):
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# -------------------------------------------------------------------------------
# -
# Python dual-logging setup...
How to find out the number of CPUs using python
...stem:
taskset -c 0 ./main.py
with the test script:
main.py
#!/usr/bin/env python3
import multiprocessing
import os
print(multiprocessing.cpu_count())
print(os.cpu_count())
print(len(os.sched_getaffinity(0)))
then the output is:
16
16
1
nproc however does respect the affinity by default and:
tas...
What is the common header format of Python files?
...
I agree that makes sense if you use any Python 2. For Python3, personally I'm happy to rely on implicit when the default is sensible and universal. We don't explicitly define the meaning of "+" whenever we use it.
– Jonathan Hartley
Jun 16 ...