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Using a dictionary to count the items in a list [duplicate]
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in 2.7 and 3.1 there is special Counter dict for this purpose.
>>> from collections import Counter
>>> Counter(['apple','red','apple','red','red','pear'])
Counter({'red': 3, 'apple': 2, 'pear': 1})
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What are dictionary view objects?
In python 2.7, we got the dictionary view methods available.
5 Answers
5
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ipython reads wrong python version
...e following points show the chain of the problematics. I'm running Python 2.7 on Mac Lion.
11 Answers
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大数据时代的数据化运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...时我们用了一个比较特殊的渠道，我们在7天出了七八个版本，每天一个以上的版本，我们用了一个礼拜的时间，最终才把产品调到了预期的数据。
如何做到数据化运营
总体来讲，我们只关注表现以及一些变化趋势，现在做得...
ImportError: DLL load failed: %1 is not a valid Win32 application. But the DLL's are there
...ly I used python's ability to introspect what was being loaded. For python 2.7 this means:
import imp
imp.find_module("cv2")
This turned up a completely unexpected "cv2.pyd" file in an Anaconda DLL directory that wasn't touched by multiple uninstall/install attempts. Python was looking there firs...
How to convert a file into a dictionary?
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If your python version is 2.7+, you can also use a dict comprehension like:
with open('infile.txt') as f:
{int(k): v for line in f for (k, v) in (line.strip().split(None, 1),)}
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How to convert a JSON string to a Map with Jackson JSON
... in java doc : @since 2.5 -- but will probably deprecated in 2.7 or 2.8 (not needed with 2.7)
– Al-Mothafar
Aug 29 '16 at 12:01
add a comment
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How to install pip for Python 3 on Mac OS X?
OS X (Mavericks) has Python 2.7 stock installed. But I do all my own personal Python stuff with 3.3. I just flushed my 3.3.2 install and installed the new 3.3.3. So I need to install pyserial again. I can do it the way I've done it before, which is:
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Mac OS X安装Bochs - 更多技术 - 清泛网 - 专注C/C++及内核技术
Mac OS X安装Bochs1.安装x11;2.开启Mac OS X的root用户3.configure我在这里遇到的问题是，提示我少一个这个头文件X11 extensions Xrandr.h谷歌了一下，机子...1.安装x11;
2.开启Mac OS X的root用户
3.configure
我在这里遇到的问题是，提示我少一个...
2023年1月8日签到记录贴 - 灌水吐槽、新手试贴 - 清泛IT论坛，有思想、有深度
...所自动生成的,如果您还未签到,请点此进行签到的操作. 我在 2023-01-08 12:31 完成签到,是今天第一个签到的用户,获得随机奖励 F币 5,另外我还额外获得了 F币 10.我今天最想说:「哈哈哈哈」. 我在 2023-01-08 20:46 完成签到,是今天第2个...