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Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values
...> df = pd.DataFrame({'A': [a], 'B': [b]})
>>> df
A B
0 2 3
or use scalar values and pass an index:
>>> df = pd.DataFrame({'A': a, 'B': b}, index=[0])
>>> df
A B
0 2 3
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Extract month and year from a zoo::yearmon object
...ar with century
[1] "2012"
> format(date1, "%m") ## numeric month
[1] "03"
These are returned as characters. Where appropriate, wrap in as.numeric() if you want the year or numeric month as a numeric variable, e.g.
> as.numeric(format(date1, "%m"))
[1] 3
> as.numeric(format(date1, "%Y"))...
How does Java handle integer underflows and overflows and how would you check for it?
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223
If it overflows, it goes back to the minimum value and continues from there. If it underflows, i...
C++, variable declaration in 'if' expression
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fwyzardfwyzard
1,3801111 silver badges1616 bronze badges
26
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App Inventor 2 手势识别扩展教程 - GestureDetector · App Inventor 2 中文网
...anvas事件冲突？
Q2: 手势识别灵敏度如何调整？
Q3: 如何实现下拉刷新？
总结
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现在已有内置组件「多点触控」：双击、长按、滑动、双指缩放和旋转、多点追踪都不用再导入拓展，推荐直接使用...
Functional programming - is immutability expensive? [closed]
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edited Nov 5 '10 at 13:49
answered Nov 5 '10 at 10:45
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Best way to strip punctuation from a string
...).timeit(1000000)
This gives the following results:
sets : 19.8566138744
regex : 6.86155414581
translate : 2.12455511093
replace : 28.4436721802
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What is the best way to convert an array to a hash in Ruby
...y keys or values!
Building on @John Topley's popular answer, let's try:
a3 = [ ['apple', 1], ['banana', 2], [['orange','seedless'], 3] ]
h3 = Hash[*a3.flatten]
This throws an error:
ArgumentError: odd number of arguments for Hash
from (irb):10:in `[]'
from (irb):10
The constru...
Get just the filename from a path in a Bash script [duplicate]
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answered Jul 29 '10 at 13:29
paxdiablopaxdiablo
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get NSDate today, yesterday, this Week, last Week, this Month, last Month… variables
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93
Adapted from the Date and Time Programming Guide:
// Right now, you can remove the seconds into...