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如何高效的学习掌握新技术 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...多个项目参考对照。以下就是部分我学习和参考过的项目列表：
emmenko/redux-react-router-async-example · GitHub 一个服务端交互的示例
quangbuule/redux-example · GitHub 一个和Immutable.js整合的示例
Rebuilding HipChat with React.js 一个和我要做项...
Most pythonic way to delete a file which may not exist
...the module glob.
from glob import glob
import os
for filename in glob("*.csv"):
os.remove(filename)
Glob finds all the files that could select the pattern with a *nix wildcard, and loops the list.
Reading/parsing Excel (xls) files with Python
What is the best way to read Excel (XLS) files with Python (not CSV files).
12 Answers
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Finding duplicate values in a SQL table
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Fails for me. I get: "DBD::CSV::st execute failed: Use of uninitialized value $_[1] in hash element at /Users/hornenj/perl5/perlbrew/perls/perl-5.26.0/lib/site_perl/5.26.0/SQL/Eval.pm line 43"
– Nigel Horne
Aug 28...
MFC子窗口和父窗口（SetParent,SetOwner） - C/C++ - 清泛网 - 专注C/C++及内核技术
...更加灵活的管理窗口。举个例子：组合框（combobox)的下拉列表框（list box）可以超出组合框的父窗口的客户区，这样有利于显示，因此系统创建该list box的时候，是作为控制台窗口（desktop window）的子窗口，它的父窗口hWndParent是NU...
Redis: Show database size/size for keys
...pection on db file - I wrote a script to parse dump.rdb files and output a csv file reporting the approximate memory used by each key. See github.com/sripathikrishnan/redis-rdb-tools
– Sripathi Krishnan
Apr 2 '12 at 5:56
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MySQL error code: 1175 during UPDATE in MySQL Workbench
...ample when you develop stand-alone features that you may want to export to csv directly and then mark it as exported or something similar. Other times it's annoying due to global updates which obviously does not have any pk filter. I see it more as a noob-protection than a real useful feature.
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Simple Pivot Table to Count Unique Values
...aven't yet saved your file as an Excel (.xlsx) file yet (eg: you opened a .csv file), the option to "Add this data to the Data Model" is disabled/greyed out. The simple solution is to save the file as an Excel file.
– PonyEars
Mar 9 '16 at 0:18
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Identify if a string is a number
... @Lucas Actually, there's some really nice stuff in there, like a full csv parser. No reason not to use it if it exists in there.
– Nyerguds
Apr 4 '16 at 12:04
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Drop unused factor levels in a subsetted data frame
...rwards. Try the following before loading your data with read.table or read.csv:
options(stringsAsFactors = FALSE)
The disadvantage is that you're restricted to alphabetical ordering. (reorder is your friend for plots)
...