大约有 40,000 项符合查询结果（耗时：0.0404秒） [XML]
How do I increase the cell width of the Jupyter/ipython notebook in my browser?
...ou need nodejs for that. installed both, now I get "Cannot find template: "index.html"" message. At this point I gave up, I'm staying with jupyter notebook.
– Itamar Katz
May 21 '19 at 7:29
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One-liner to check whether an iterator yields at least one element?
... Similarly if you need to check if the iterator is empty, one could use all(False for _ in iterator) will check if the iterator is empty. (all returns True if the iterator is empty, otherwise it stops when it sees the first False element)
– KGardevoir
Apr 3 ...
How do you run your own code alongside Tkinter's event loop?
...tion for the after method:
def after(self, ms, func=None, *args):
"""Call function once after given time.
MS specifies the time in milliseconds. FUNC gives the
function which shall be called. Additional parameters
are given as parameters to the function call. Return
identifier...
What is a clean, pythonic way to have multiple constructors in Python?
...
Actually None is much better for "magic" values:
class Cheese():
def __init__(self, num_holes = None):
if num_holes is None:
...
Now if you want complete freedom of adding more parameters:
class Cheese...
Python unittest - opposite of assertRaises?
...the correct solution in fact. The solution proposed by user9876 is conceptually flawed: if you test for the non-raising of say ValueError, but ValueError is instead raised, your test must exit with a failure condition, not an error one. On the other hand, if in running the same code you would raise ...
Principal component analysis in Python
...
Months later, here's a small class PCA, and a picture:
#!/usr/bin/env python
""" a small class for Principal Component Analysis
Usage:
p = PCA( A, fraction=0.90 )
In:
A: an array of e.g. 1000 observations x 20 variables, 1000 rows x 20 colum...
correct way to use super (argument passing)
...
Shouldn't Base call super(Base, self).__init__()?
– cha0site
Jan 23 '12 at 14:47
4
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What is the purpose of class methods?
...sson was that Python is not Java , and so I've just spent a while turning all my Class methods into functions.
17 Answers
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Network tools that simulate slow network connection [closed]
...
I use Clumsy (jagt.github.io/clumsy/index.html) myself.
– simongus
Feb 25 '14 at 17:50
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App Inventor 2 列表代码块 · App Inventor 2 中文网
...行切片来返回一个列表。
返回的列表包含输入列表中从index1开始到但不包括index2的项目。
案例：列表遍历
列表代码块中没有提供遍历的方法，遍历逻辑在控制代码块中，提供 2 种遍历方式：
方法1：...