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“cannot resolve symbol R” in Android Studio
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Selecting pandas column by location
... mind:
>>> df
A B C D
0 0.424634 1.716633 0.282734 2.086944
1 -1.325816 2.056277 2.583704 -0.776403
2 1.457809 -0.407279 -1.560583 -1.316246
3 -0.757134 -1.321025 1.325853 -2.513373
4 1.366180 -1.265185 -2.184617 0.881514
>>> df.iloc[:, ...
What does the “map” method do in Ruby?
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The map method takes an enumerable object and a block, and runs the block for each element, out...
How to set Python's default version to 3.x on OS X?
...tain Lion and the basic default Python version is 2.7. I downloaded Python 3.3 and want to set it as default.
21 Answers
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What's the u prefix in a Python string?
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You're right, see 3.1.3. Unicode Strings.
It's been the syntax since Python 2.0.
Python 3 made them redundant, as the default string type is Unicode. Versions 3.0 through 3.2 removed them, but they were re-added in 3.3+ for compatibility wi...
Integrate ZXing in Android Studio
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I was integrating ZXING into an Android application and there were no good sources for the inpu...
How can I force division to be floating point? Division keeps rounding down to 0?
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In Python 2, division of two ints produces an int. In Python 3, it produces a float. We can get the new behaviour by importing from __future__.
>>> from __future__ import division
>>> a = 4
>>> b = 6
>>> c = a / b
>>> c
0.66666666666666663
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JavaScript function similar to Python range()
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23 Answers
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Implementing slicing in __getitem__
...m__(self, val):
... print val
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>>> c = C()
>>> c[3]
3
>>> c[3:4]
slice(3, 4, None)
>>> c[3:4:-2]
slice(3, 4, -2)
>>> c[():1j:'a']
slice((), 1j, 'a')
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What is the difference between shallow copy, deepcopy and normal assignment operation?
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Normal assignment operations will simply point the new variable towards the existing object. T...