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Merge PDF files
... for reader in map(PdfFileReader, input_streams):
for n in range(reader.getNumPages()):
writer.addPage(reader.getPage(n))
writer.write(output_stream)
finally:
for f in input_streams:
f.close()
if __name__ == '__main__':
if sys.plat...
how to listen to N channels? (dynamic select statement)
...g like this:
cases := make([]reflect.SelectCase, len(chans))
for i, ch := range chans {
cases[i] = reflect.SelectCase{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(ch)}
}
chosen, value, ok := reflect.Select(cases)
// ok will be true if the channel has not been closed.
ch := chans[chosen]
msg :...
Javascript trick for 'paste as plain text` in execCommand
... = window.clipboardData.getData('Text');
document.selection.createRange().pasteHTML(content);
}
});
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How do I write output in same place on the console?
... 'Downloading File FooFile.txt [%d%%]\r'%i,
Demo:
import time
for i in range(100):
time.sleep(0.1)
print 'Downloading File FooFile.txt [%d%%]\r'%i,
Python 3
print('Downloading File FooFile.txt [%d%%]\r'%i, end="")
Demo:
import time
for i in range(100):
time.sleep(0.1)
prin...
Excel Date to String conversion
...
Here is a VBA approach:
Sub change()
toText Sheets(1).Range("A1:F20")
End Sub
Sub toText(target As Range)
Dim cell As Range
For Each cell In target
cell.Value = cell.Text
cell.NumberFormat = "@"
Next cell
End Sub
If you are looking for a solution witho...
Long vs Integer, long vs int, what to use and when?
...
By default use an int, when holding numbers.
If the range of int is too small, use a long
If the range of long is too small, use BigInteger
If you need to handle your numbers as object (for example when putting them into a Collection, handling null, ...) use Integer/Long inste...
What's the main difference between int.Parse() and Convert.ToInt32
...
int.Parse(string s)
Integer in RANGE > returns integer value
Null value > ArguementNullException
Not in format > FormatException
Value not in RANGE > OverflowException
...
How to print out the contents of a vector?
...for more complicated objects where this solution is not going to be ideal.
range-based for loop (C++11)
See Jefffrey's solution. In C++11 (and later) you can use the new range-based for loop, which looks like this:
for (auto i: path)
std::cout << i << ' ';
Since path is a vector of it...
Which is the fastest algorithm to find prime numbers?
...e reduces the number of operations compared to SoA: For the 32-bit number range (2^32 - 1), primesieve does about 1.2 billion culls whereas SoA does a total of about 1.4 billion combined toggle and square free operations, both operations being of about the same complexity and able to be optimized i...
Lazy Method for Reading Big File in Python?
..._row(chunksize=1024):
with open(test_file, 'w') as f:
for i in range(1025):
f.write('a')
with open(test_file) as f:
assert len(list(rows(f, chunksize=chunksize))) == 1
@cleanup
def test_1024_chars_2_rows(chunksize=1024):
with open(test_file, 'w') as f:
...