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Creating an empty Pandas DataFrame, then filling it?
...datetime.now().date()
index = pd.date_range(todays_date-datetime.timedelta(10), periods=10, freq='D')
columns = ['A','B', 'C']
Note: we could create an empty DataFrame (with NaNs) simply by writing:
df_ = pd.DataFrame(index=index, columns=columns)
df_ = df_.fillna(0) # with 0s rather than NaNs
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How to export/import PuTTy sessions list?
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Second Command worked for me on Windows 7, however, I needed to run CMD as administrator.
– The Humble Rat
Oct 16 '15 at 7:36
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Test if lists share any items in python
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Thanks, @Dave. :) I agree removing the lambda is a win.
– Matthew Flaschen
Jul 3 '10 at 23:31
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Error installing libv8: ERROR: Failed to build gem native extension
...Failed to build gem native extension." error
– sixty4bit
Jan 14 '15 at 3:45
1
I uninstall and rei...
Why are flag enums usually defined with hexadecimal values
...at hexadecimal reminds you: "Okay, we're not dealing with numbers in the arbitrary human-invented world of base ten anymore. We're dealing with bits - the machine's world - and we're gonna play by its rules." Hexadecimal is rarely used unless you're dealing with relatively low-level topics where t...
XAMPP - Port 80 in use by “Unable to open process” with PID 4! 12
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Open a CMD prompt as administrator and execute the following command:
net stop was /y
Open the Run dialog box (press Win+R), then type: services.msc
Then search for World Wide Web Publishing Service (WWW-Publishing Service) and Web Deployment Agent Service and stop them. You s...
How to know when UITableView did scroll to bottom in iPhone
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Modified neoneyes answer a bit.
This answer targets those of you who only wants the event to be triggered once per release of the finger.
Suitable when loading more content from some content provider (web service, core data etc).
Note that this appro...
How to detect if multiple keys are pressed at once using JavaScript?
... found me');
}else if(map[13]){ // ENTER
alert('You pressed Enter. You win the prize!')
}
// Incorrect:
if(map[17] && map[13]){ // CTRL+ENTER
alert('You found me');
}else if(map[17] && map[16] && map[13]){ // CTRL+SHIFT+ENTER
alert('Whoa, mr. power user');
}else ...
Most efficient way to create a zero filled JavaScript array?
What is the most efficient way to create an arbitrary length zero filled array in JavaScript?
41 Answers
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How can I check if a single character appears in a string?
... the character occurrences up-front. This is an implementation that uses a bit array contained into a long array:
public class FastCharacterInStringChecker implements Serializable {
private static final long serialVersionUID = 1L;
private final long[] l = new long[1024]; // 65536 / 64 = 1024
publ...