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How do I put a variable inside a string?
...file2.pdf' etc. This is how it worked:
['file' + str(i) + '.pdf' for i in range(1,4)]
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Numpy array dimensions
...ow 1 and column 0, 0-based index)
shape
describes how many data (or the range) along each available axis.
In [5]: a.shape
Out[5]: (2, 2) # both the first and second axis have 2 (columns/rows/pages/blocks/...) data
shar...
How to convert hex to rgb using Java?
...
A hex color code is #RRGGBB
RR, GG, BB are hex values ranging from 0-255
Let's call RR XY where X and Y are hex character 0-9A-F, A=10, F=15
The decimal value is X*16+Y
If RR = B7, the decimal for B is 11, so value is 11*16 + 7 = 183
public int[] getRGB(String rgb){
int[...
When should I use C++14 automatic return type deduction?
... work.
As a real-world example, I was asked to change a module from using raw pointers everywhere to smart pointers. Fixing the unit tests was more painful than the actual code.
While there are other ways this could be handled, the use of auto return types seems like a good fit.
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How do I discover memory usage of my application in Android?
...system to this point.
Going lower-level, you can use the Debug API to get raw kernel-level information about memory usage: android.os.Debug.MemoryInfo
Note starting with 2.0 there is also an API, ActivityManager.getProcessMemoryInfo, to get this information about another process: ActivityManager.g...
How to map with index in Ruby?
...o you can call map, select, reject etc. on it just like on an array, hash, range etc.
– sepp2k
Jan 15 '11 at 1:45
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What is the source code of the “this” module doing?
...
This is called rot13 encoding:
d = {}
for c in (65, 97):
for i in range(26):
d[chr(i+c)] = chr((i+13) % 26 + c)
Builds the translation table, for both uppercase (this is what 65 is for) and lowercase (this is what 97 is for) chars.
print "".join([d.get(c, c) for c in s])
Prints...
Multiplication on command line terminal
...other higher-order function
pythonp "n=10;functools.reduce(lambda x,y:x*y, range(1,n+1))"
3628800
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How to print a groupby object
... = pd.DataFrame({'A': ['one', 'one', 'two', 'three', 'three', 'one'], 'B': range(6)})
Then simple 1 line code
df.groupby('A').apply(print)
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Add SUM of values of two LISTS into new LIST
...eed zip, numpy or anything else.
Python 2.x and 3.x:
[a[i]+b[i] for i in range(len(a))]
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