Recent questions tagged Python

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python - Is numpy.sum implemented in such a way that numerical errors are avoided?

It is well known that adding up numbers can result in numerical errors (for example, if the first number ... that numerical errors are avoided? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What does 'result[::-1]' mean?

I am just coming cross the following python code which confuses me a bit: res = self.result[::-1].encode(' ... -1] mean, especially the colons? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Count appearances of a value until it changes to another value

I have the following DataFrame: df = pd.DataFrame([10, 10, 23, 23, 9, 9, 9, 10, 10, 10, 10, 12], columns=[' ... :3 10:4 12:1 How can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Print `numpy.ndarray` on a single line

While using scipy/numpy, I do get information that I store into a numpy.ndarray >>> a array([[ 0.15555605, ... the surrounding array(...))? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Can I make a 32-bit program with cx_Freeze if I have a 64-bit OS?

I am currently running Windows 7 Home 64-bit and am working on a program that I would like to make available ... }}, executables = executables ) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Get the memory address pointed to by a ctypes pointer

Short version: How can I get the address that a ctypes pointer points to? Long version: I have registered a python ... buf. How can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Plot a Single XGBoost Decision Tree

I am using method on https://machinelearningmastery.com/visualize-gradient-boosting-decision-trees-xgboost-python/ to ... ' is quite appreciated See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - numpy array subclass unexpedly shares attributes across instances

I am having a weird subclass numpy.ndarray issue that feels like Values of instance variables of superclass persist across ... ' b.attrs # {} See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Contents of locmem cache in Django?

I was trying to use the locmem cache for my web application but couldn't find any documentation on how to ... memcache, not the locmem cache. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - JSON: save one dict per line

How do I save a list of python dictionaries to a file, where each dictwill be saved in one line? I know I can ... ... {key1:value,key2:value}] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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380 views

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python - What's the difference between setattr() and object.__setattr__()?

I know that you can't call object.__setattr__ on objects not inherited from object, but is there anything else that ... 2.6, if this matters. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - python27 matplotlib: first and last element connected

Hi I have found the same problem but without an answer: enter link description here My problem is that I try ... please help me. Cheers Max See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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388 views

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python - How to arrange plots of secondary axis to be below plots of primary axis in matplotlib?

I am trying to plot two curves on two y-axes as shown in figure. But the green plot (needle lift) ... .LinearLocator(primary_ticks)) plt.show() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Fast(er) numpy fancy indexing and reduction?

I'm trying to use and accelerate fancy indexing to "join" two arrays and sum over one of results' axis. ... .weave or Cython's prange ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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772 views

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python - AttributeError: Could not find PyAudio; check installation...can't use speech Recognition

I'm trying to make a basic speech Recognition assistant. When I run the code, it tells me: Traceback (most recent call ... get that...") hear() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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336 views

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python - Variable Scope In Generators In Classes

I think that I know how variables and generators work in Python well. However, the following code makes me confused. ... is it wrong in class? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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390 views

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python - SSLError installing with pip

I'm trying to install Django on a windows 10 . Whatever I try to install with pip on cmd, I get those ... .org --trusted-host pypi.org django See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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python - Skimage - Weird results of resize function

I am trying to resize a .jpg image with skimage.transform.resize function. Function returns me weird result ( ... function has similar bug. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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261 views

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python - Why does simple echo in subprocess not working

I'm trying to perform simple echo operation using subprocess: import subprocess import shlex cmd = 'echo $HOME' ... . Any help is appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python shuffle algorithm performance

I was wondering about the time complexity of the shuffle function in the random Python library/module. Is it ... belong to Python libraries? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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395 views

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python - Where can I find a list of numpy functions which release the GIL?

I have found several SO questions asking about this in one way or another, but none of them actually either ... read the numpy source. Really? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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260 views

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python - How to remove the date information in a column, just keep time

I am using pandas dataframe. there is a specific column has time information. the raw data likes this: 5:15am 5: ... can I remove it. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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311 views

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python - How to store an integer leaded by zeros in django

I'm trying to store a number in django that looks like this: 000001 My problem is that if I type this inside ... number in it's integer form) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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910 views

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python - matplotlib - duplicate plot from one figure to another?

I'm somewhat new to matplotlib. What I'm trying to do is write code that saves several figures to eps ... this would be done with matplotlib. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Convert a numpy array of lists to a numpy array

I have some data which is stored as a numpy array with dtype=object, and I would like to extract one column of ... a better way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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466 views

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python - Difference between pip3 and `python3 setup.py install` regarding cmdclass argument

I tried to configure my package such that a script is executed on the installation process. Therefore, I inherited ... to hear from you guys. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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398 views

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python - How are Inf and NaN implemented?

As mathematical concepts, I am well aware of what inf and nan actually are. But what I am really interested in is how ... that of java or c++? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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425 views

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python - Tensorflow negative sampling

I am trying to follow the udacity tutorial on tensorflow where I came across the following two lines for ... /examples/udacity/5_word2vec.ipynb See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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