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Append column to pandas dataframe
... way probably only matters when you consider edge cases. For instance here if both DataFrames had a 'data' column the join would fail, whereas a concat would give you two columns named 'data'.
– U2EF1
Dec 16 '13 at 20:37
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What is the difference between PS1 and PROMPT_COMMAND
... http://www.gnu.org/software/bash/manual/bashref.html
PROMPT_COMMAND
If set, the value is interpreted as a command to execute before
the printing of each primary prompt ($PS1).
I never used it, but I could have used this back when I only had sh.
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Converting PKCS#12 certificate into PEM using OpenSSL
...n path.p12 -out newfile.key.pem -nocerts -nodes
After that you have:
certificate in newfile.crt.pem
private key in newfile.key.pem
To put the certificate and key in the same file without a password, use the following, as an empty password will cause the key to not be exported:
openssl pkcs12 -in ...
Difference between C++03 throw() specifier C++11 noexcept
Is there any difference between throw() and noexcept other than being checked at runtime and compile time, respectively?
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What's the correct way to convert bytes to a hex string in Python 3?
...e binascii module:
>>> import binascii
>>> binascii.hexlify('foo'.encode('utf8'))
b'666f6f'
>>> binascii.unhexlify(_).decode('utf8')
'foo'
See this answer:
Python 3.1.1 string to hex
share
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How to exclude file only from root folder in Git
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From the documentation:
If the pattern does not contain a slash /, git treats it as a shell glob pattern and checks for a match against the pathname relative to the location of the .gitignore file (relative to the toplevel of the work tree if not fr...
In C++, if throw is an expression, what is its type?
...ument to most operators. Obviously, you can hide them in parenthesis, but if they aren't ignored (first argument of builtin operator , for instance), it is a type error.
– AProgrammer
Jul 31 '09 at 15:21
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How to find a hash key containing a matching value
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@Coderama The difference between find and select is that find returns the first match and select (which is aliased by findAll) returns all matches.
– Daniel Vandersluis
Sep 25 '10 at 13:48
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Git submodule add: “a git directory is found locally” issue
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This is what ultimately worked for me (this article helped out a lot):
If you haven't already run git rm --cached path_to_submodule (no trailing slash) as well as rm -rf path_to_submodule, do that!
Then:
Delete the relevant lines from the .gitmodules file. e.g. delete these:
[submodule "path...
布局列表框循序渐进：从商品清单到购物车和网络分页 · App Inventor 2 中文网
...= not (复选框_现货.Checked) or dictLookup(商品, "stock", 0) > 0
if 命中 and 满足库存 { listAdd(行列表, 商品行(商品)) }
}
布局列表框_商品.Data = 行列表
标签_状态.Text = join("找到 ", length(行列表), " 件商品")
}
when Screen1.Initialize() { 筛选...