大约有 40,000 项符合查询结果（耗时：0.0091秒） [XML]
Expand a random range from 1–5 to 1–7
Given a function which produces a random integer in the range 1 to 5, write a function which produces a random integer in the range 1 to 7.
...
Traverse a list in reverse order in Python
..., I'd write a generator.
def reverse_enum(L):
for index in reversed(xrange(len(L))):
yield index, L[index]
L = ['foo', 'bar', 'bas']
for index, item in reverse_enum(L):
print index, item
share
|
...
CORS Access-Control-Allow-Headers wildcard being ignored?
...oding, Accept-Ext, Accept-Features, Accept-Language, Accept-Params, Accept-Ranges, Access-Control-Allow-Credentials, Access-Control-Allow-Headers, Access-Control-Allow-Methods, Access-Control-Allow-Origin, Access-Control-Expose-Headers, Access-Control-Max-Age, Access-Control-Request-Headers, Access-...
Why do people say there is modulo bias when using a random number generator?
...te the numbers between 0 and 2 with equal probability. Of course for small ranges this might not be the biggest issue but for a larger range this could skew the distribution, biasing the smaller numbers.
So when does rand()%n return a range of numbers from 0 to n-1 with equal probability? When RAN...
Set the maximum character length of a UITextField
...ctive-C
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
// Prevent crashing undo bug – see note below.
if(range.length + range.location > textField.text.length)
{
return NO;
}
NSU...
Iterating each character in a string using Python
...
Instead of your first while loop, you can do: for i in range(len(str)): print(str[i]) Which in my opinion is better than having to manage the counter on your own. Even better is marcog's answer using enumerate.
– aiham
Apr 13 '11 at 6:3...
How to take the first N items from a generator or list in Python? [duplicate]
...
In my taste, it's also very concise to combine zip() with xrange(n) (or range(n) in Python3), which works nice on generators as well and seems to be more flexible for changes in general.
# Option #1: taking the first n elements as a list
[x for _, x in zip(xrange(n), generator)]
# ...
How to use filter, map, and reduce in Python 3
...def f(x): return x % 2 != 0 and x % 3 != 0
...
>>> list(filter(f, range(2, 25)))
[5, 7, 11, 13, 17, 19, 23]
>>> def cube(x): return x*x*x
...
>>> list(map(cube, range(1, 11)))
[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000]
>>> import functools
>>> def add(...
How to use a decimal range() step value?
...f you really want to use a floating-point step value, you can, with numpy.arange.
>>> import numpy as np
>>> np.arange(0.0, 1.0, 0.1)
array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9])
Floating-point rounding error will cause problems, though. Here's a simple ca...
Is there a Python Library that contains a list of all the ascii characters?
...
Here it is:
[chr(i) for i in xrange(127)]
share
|
improve this answer
|
follow
|
...