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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...
Sublime Text 3能用支持的插件推荐 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...写的一篇文章，Sublime text 3如何安装package control办法。
此外，安装sublime text 3的插件还可以在github上下载源文件，解压后改名放到
C:\Users\Mr.DenGo(你的电脑名)\AppData\Roaming\Sublime Text 3\Packages 中
重启sublime text 3即可生效。
BracketHig...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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value
待编码的 value ，除了resource 类型之外，可以为任何数据类型
该函数只能接受 UTF-8 编码的数据
options
由以下常量组成的二进制掩码： JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_...
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)
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