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One-line list comprehension: if-else variants
...I've got a list comprehension that produces list of odd numbers of a given range:
5 Answers
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Input placeholders for Internet Explorer
...
if (input.val() === text) input.css({ color:'lightGrey' }).selectRange(0,0).one('keydown', function(){
input.val("").css({ color:'black' });
});
});
input.blur(function(){
if (input.val() == "" || input.val() === text) input.val(text).css({...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
.... Instead you should use syntax similar to this :
df = pd.DataFrame(data=range(5), index=[1, 2, 3, 3, 3])
result = df[df.index == 3]
isinstance(result, pd.DataFrame) # True
result = df[df.index == 1]
isinstance(result, pd.DataFrame) # True
...
Proper use of errors
...rror in the JavaScript engine is thrown. E.g.
"too much recursion".
RangeError --- Creates an instance representing an error that occurs when a numeric variable or parameter is outside of its valid
range.
ReferenceError --- Creates an instance representing an error that occurs when de-...
How to generate a random int in C?
...actice to use the % operator in conjunction with rand() to get a different range (though bear in mind that this throws off the uniformity somewhat). For example:
/* random int between 0 and 19 */
int r = rand() % 20;
If you really care about uniformity you can do something like this:
/* Returns ...
How to delete multiple buffers in Vim?
...
:3,5bd[elete]
Will delete buffer range from 3 to 5 .
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How to find all positions of the maximum value in a list?
..., 31, 55, 21, 40, 18, 50,
35, 41, 49, 37, 19, 40, 41, 31]
b = range(10000)
c = range(10000 - 1, -1, -1)
d = b + c
def maxelements_s(seq): # @SilentGhost
''' Return list of position(s) of largest element '''
m = max(seq)
return [i for i, j in enumerate(seq) if j == m]
def m...
Generate colors between red and green for a power meter?
...d green values. Assuming your max red/green/blue value is 255, and n is in range 0 .. 100
R = (255 * n) / 100
G = (255 * (100 - n)) / 100
B = 0
(Amended for integer maths, tip of the hat to Ferrucio)
Another way to do would be to use a HSV colour model, and cycle the hue from 0 degrees (red) to...
How to check a string for specific characters?
...dom_string(length=1000):
random_list = [choice(ascii_letters) for x in range(length)]
return ''.join(random_list)
def function_using_any(phrase):
return any(i in 'LD' for i in phrase)
def function_using_if_then(phrase):
if ('L' in phrase) or ('D' in phrase):
return True
...
Generate an integer that is not among four billion given ones
...s that happen to fall outside the (signed or unsigned; your choice) 32-bit range.
If "integer" means mathematical integer: Read through the input once and keep track of the largest number length of the longest number you've ever seen. When you're done, output the maximum plus one a random number th...