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How can I filter lines on load in Pandas read_csv function?
...t pandas as pd
iter_csv = pd.read_csv('file.csv', iterator=True, chunksize=1000)
df = pd.concat([chunk[chunk['field'] > constant] for chunk in iter_csv])
You can vary the chunksize to suit your available memory. See here for more details.
...
Android Camera : data intent returns null
...
Awesome ! Thanks a lot for explanation :) +100
– Muhammad Riyaz
Jun 12 '13 at 12:36
Th...
How to get file creation & modification date/times in Python?
...stat('somefile.txt')
>>> statinfo
(33188, 422511L, 769L, 1, 1032, 100, 926L, 1105022698,1105022732, 1105022732)
>>> statinfo.st_size
926L
>>>
In the above example you would use statinfo.st_mtime or statinfo.st_ctime to get the mtime and ctime, respectively.
...
Adding iOS UITableView HeaderView (not section header)
... UILabel *headerLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 5,100,20)];
headerLabel.textAlignment = NSTextAlignmentRight;
headerLabel.text = @"LeadCode ";
//headerLabel.textColor=[UIColor whiteColor];
headerLabel.backgroundColor = [UIColor clearColor];
[headerView...
Android - how do I investigate an ANR?
...oadFile(urls[i]);
publishProgress((int) ((i / (float) count) * 100));
// Escape early if cancel() is called
if (isCancelled()) break;
}
return totalSize;
}
// This is called each time you call publishProgress()
protected void onProgres...
Add margin above top ListView item (and below last) in Android
...r even better (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());
– Eugen Pechanec
Sep 29 '14 at 13:04
1
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Django-DB-Migrations: cannot ALTER TABLE because it has pending trigger events
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Almost same for me. It worked flawlessly for 100+ migrations(including ~20 data migrations) until today, while adding unique together constraint along with data migration removing duplicates before it. PostgreSQL 10.0
– LinPy fan
A...
Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
...ring data. Here's an example,
df2 = df.assign(D=list('aaabbccc')).sample(n=100, replace=True)
with pd.option_context('precision', 2):
display(df2.groupby(['A', 'B'])
.describe(include='all')
.dropna(how='all', axis=1))
C ...
How to organize large R programs?
...the interpreter much more robust than before. There is no doubt that R is 100-300x slower than C, but usually the bottleneck is concentrated around a few lines of code, which can be delegated to C/C++. I think it would be a mistake to delegate the strengths of R in data manipulation and statistical...
ggplot with 2 y axes on each side and different scales
...= "Productivity % of best",
labels = function(b) { paste0(round(b * 100, 0), "%")})) +
theme(
axis.title.y = element_text(color = "grey"),
axis.title.y.right = element_text(color = "blue"))
Here's the result (above code + some color tweaking):
The point (aside from using ...