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C# Xml中SelectSingleNode方法中的xpath用法（Xml节点操作最佳方式） - 更...
...返回单个节点可使用SelectSingleNode方法，该方法如果查询到一个或多个节点，返回第一个节点；如果没有查询的任何节点返回 Nothing。例如：
objNode = objNode.SelectSingleNode("/Company/Department/Employees/Employee")
if (objNode == null)
// - Do p...
Max retries exceeded with URL in requests
...cause the target machine actively refused it".
There is an issue at about python.requests lib at Github, check it out here
To overcome this issue (not so much an issue as it is misleading debug trace) you should catch connection related exceptions like so:
try:
page1 = requests.get(ap)
except...
Convert DataFrame column type from string to datetime, dd/mm/yyyy format
...tetime(df['date_col'], format='%d/%m/%Y')
More details on format here:
Python 2 https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
Python 3 https://docs.python.org/3.7/library/datetime.html#strftime-strptime-behavior
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Python: fastest way to create a list of n lists
... is about 15 % faster on my machine.
Edit: Using NumPy, you can avoid the Python loop using
d = numpy.empty((n, 0)).tolist()
but this is actually 2.5 times slower than the list comprehension.
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How to make a class property? [duplicate]
In python I can add a method to a class with the @classmethod decorator. Is there a similar decorator to add a property to a class? I can better show what I'm talking about.
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How do I find the duplicates in a list and create another list with them?
How can I find the duplicates in a Python list and create another list of the duplicates? The list only contains integers.
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Viewing all defined variables [duplicate]
I'm currently working on a computation in python shell. What I want to have is Matlab style listout where you can see all the variables that have been defined up to a point (so I know which names I've used, their values and such).
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Filtering a list of strings based on contents
... 'ab' in them. I.e. the result is ['ab','abc'] . How can this be done in Python?
5 Answers
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Getting MAC Address
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Python 2.5 includes an uuid implementation which (in at least one version) needs the mac address. You can import the mac finding function into your own code easily:
from uuid import getnode as get_mac
mac = get_mac()
The ...
Cosine Similarity between 2 Number Lists
...th vectors (more of a matrix transpose, actually) just to get the data in "Pythonic" order. It would be interesting to time the nuts-and-bolts implementation:
import math
def cosine_similarity(v1,v2):
"compute cosine similarity of v1 to v2: (v1 dot v2)/{||v1||*||v2||)"
sumxx, sumxy, sumyy ...