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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Paint的实例化操作不要写在onDraw()方法中等）；
对于并发下载等类似逻辑的实现尽量避免多次创建线程对象，而是交给线程池处理。
当然了，有了上面说明GC导致的性能后我们就该定位分析问题了，可以通过运行DDMS->Allocation T...
Which is the preferred way to concatenate a string in Python?
...building it up over a lot of operations.
from cStringIO import StringIO
# python3: from io import StringIO
buf = StringIO()
buf.write('foo')
buf.write('foo')
buf.write('foo')
buf.getvalue()
# 'foofoofoo'
If you already have a complete list returned to you from some other operation, then just ...
What character to use to put an item at the end of an alphabetic list?
...No, "Ω, 末, 口…" are not non-printable characters, silly. Upgrade to Python3 already. ;)
– Gringo Suave
Feb 15 '19 at 17:57
...
What's the difference between lists enclosed by square brackets and parentheses in Python?
...ove 'y=x' example , list and tuple behave in the same way now (verified in python3.8.5)
– Youjun Hu
Aug 15 at 9:11
add a comment
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How do I mock an open used in a with statement (using the Mock framework in Python)?
...
Note: in Python3 the builtin file is gone!
– exhuma
Apr 28 '14 at 9:16
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s...
Converting a column within pandas dataframe from int to string
...
Regarding @JohnZwinck's comment, using Python3 it seems to be more like 2x as fast to use apply() instead of astype(): timeit.Timer('c.apply(str)', setup='import pandas as pd; c = pd.Series(range(1000))').timeit(1000) >>> 0.41499893204309046 ...
How can you get the SSH return code using Paramiko?
...
Thanks for JanC, I added some modification for the example and tested in Python3, it really useful for me.
import paramiko
import getpass
pw = getpass.getpass()
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.WarningPolicy())
#client.set_missing_host_key_policy(paramik...
浅谈APM在电子交易系统中的应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...务器环境内；
·在终端用户设备，连续或按需即时下载。[2]
APM最新发展方向
如果这还没有让APM足够模糊，现在又出现了另一种新方法，即基于网络的 APM，这是一个无代理系统，它充分深入到现有网络设备，观察整个企...
How can I check if character in a string is a letter? (Python)
... False
� False
� False
� False
� False
� False
>>>
In python3.x:
>>> s = 'a1中文'
>>> for char in s: print(char, char.isalpha())
...
a True
1 False
中 True
文 True
>>>
This code work:
>>> def is_alpha(word):
... try:
... re...
Python 3.x rounding behavior
... if copied into an interpreter for further documentation.
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
def trueround(number, places=0):
'''
trueround(number, places)
example:
>>> trueround(2.55, 1) == 2.6
True
uses standard functions with no import to...