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Adding new column to existing DataFrame in Python pandas
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1091
Use the original df1 indexes to create the series:
df1['e'] = pd.Series(np.random.randn(sLen...
What is the best practice for dealing with passwords in git repositories?
...print(os.environ['your_env_variable'])
PS: be aware that it's probably a bit risky (but it's a quite common practice) https://www.bleepingcomputer.com/news/security/javascript-packages-caught-stealing-environment-variables/
PS2: this dev.to article titled "How to securely store API keys" may be i...
What is an unsigned char?
...ired to be 1 (i.e. one byte), but a byte could in theory be for example 32 bits. sizeof would still be report its size as 1 - meaning that you could have sizeof (char) == sizeof (long) == 1.
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Increment a database field by 1
...gins)+1? Essentially you'd run a query much like the following - perhaps a bit more complex depending on your specific needs:
INSERT into mytable (logins)
SELECT max(logins) + 1
FROM mytable
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Interface defining a constructor signature?
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DanDan
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Javascript / Chrome - How to copy an object from the webkit inspector as code
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return undefined in chrome Version 49.0.2623.87 (64-bit) ? why >?
– Pardeep Jain
Aug 19 '16 at 6:33
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How to make a cross-module variable?
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In the real world, you have to be a bit careful with this solution. If a programmer picks up your 'global' variable using 'from a import var', (try this variation in c.py) they obtain a copy of the variable at the time of import.
– Paul Wh...
AttributeError: 'module' object has no attribute 'tests'
... import *? I've had good luck with this pattern. I understand it takes a bit more time to write up the __all__ bit at the top of each file. But importing using "death star" seems to work nicely.
– MikeyE
Jan 10 at 23:04
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“Incorrect string value” when trying to insert UTF-8 into MySQL via JDBC?
...n UTF-8. Here you have a character that needs 4 bytes: \xF0\x90\x8D\x83 (U+10343 GOTHIC LETTER SAUIL).
If you have MySQL 5.5 or later you can change the column encoding from utf8 to utf8mb4. This encoding allows storage of characters that occupy 4 bytes in UTF-8.
You may also have to set the serve...
Calling constructors in c++ without new
...ing a constructor of the format Thing(const char*).
The second one is a bit more complex. It essentially does the following
Create an object of type Thing using the constructor Thing(const char*)
Create an object of type Thing using the constructor Thing(const Thing&)
Call ~Thing() on the ...