Have a problem
When running the code, the following error prompt appears:
AttributeError:'Rectangle' object has no property 'normed'
resolvent
The reason is that the library has been updated and there is no such attribute. Delete the normal in the code (no error, but it seems that it can’t be drawn)
Replace the normal attribute in the code with density , and add an attribute stacked = true .
Thank you for your comments.
Copyright notice
Original author: brother Gu’s younger brother author blog address: http://blog.csdn.net/lfdfhl
Problem description
When installing Python 3.7.2 in win10 device, an error is reported: the error code is 2503, as shown in the figure below:
Solution
Just modify the permissions of the folder C: Windows: temp.
The first step: find the folder C: Windows: temp
Step 2: open the temp folder and edit its permissions
Step 3: change its permissions to full control
numpy.random.randn (d0, d1, … , DN) is to return one or more sample values from the standard normal distribution.
numpy.random.rand (d0, d1, … , DN) in [0,1].
numpy.random.rand (d0,d1,… ,dn)
The rand function generates data between [0,1] according to the given dimension, including 0 and excluding 1DN table. The return value of each dimension is the array of the specified dimension
np.random.rand(4,2)
array([[0.64959905, 0.14584702],
[0.56862369, 0.5992007 ],
[0.42512475, 0.83075541],
[0.75685279, 0.00910825]])
np.random.rand(4,3,2) # shape: 4*3*2
array([[[0.07304796, 0.48810928],
[0.59523586, 0.83281804],
[0.47530734, 0.50402275]],
[[0.63153869, 0.19636159],
[0.93727986, 0.13564719],
[0.11122609, 0.59646316]],
[[0.17276155, 0.66621767],
[0.81926792, 0.28781293],
[0.20228714, 0.72412133]],
[[0.29365696, 0.53956076],
[0.19105394, 0.47044441],
[0.85930046, 0.3867359 ]]])
When doing data analysis with Python, how to add a new column of weeks “week” and change the date, such as “2021-03-02” to the nth week of 2021?
Introduce two methods:
the dataframe of my data is called sample, which has the feature “date”. Now add a new feature “week”
1 dt.week
sample["week"]=sample["date"].dt.week
2. Use datetimeindex
df['week'] = pd.DatetimeIndex(sample['date']).week
Read a lot of solutions, most of the pull to download a. WHL source file, and then install in PIP, after I personally test, execute this sentence can solve!
pip3 install wheel
The gitbook project can’t run when you open it on another computer. Both gitbook serve and gitbook build report errors.
Error: ENOENT: no such file or directory, stat ‘C:\Users\Lenovo\www\mdspg\md\mybook_ book\gitbook\gitbook-plugin-fontsettings\ fontsettings.js ’
it turned out to be a bug (vision: 3.2.3).
The solution is as follows.
The following file was found in the user directory.
.gitbook\versions\3.2.3\lib\output\website\ copyPluginAssets.js
Replace all
confirm: true
with
confirm: false
Python error memoryerror
Python 32bit can only use 2G of memory at most. If the memory is larger than 2G, memoryerror will be reported.
However, 64bit Python has no such limitation, so it is recommended to use 64bit python.
Possible problems: in the past, official libraries of numpy and SciPy only supported 32bit python, but now we should release the corresponding 64bit version.
Syntax error: invalid syntax
specific solutions:
It can’t be installed under Python command line, it should be installed under CMD
Problem Description: check the consle and find that postman has been crazy to link to the local port 7890, but I didn’t use the port at all. Could not send request has been reported wrong.
Solution: 1. I install postman on one computer, and then link to the same service port. Check the consle and find that the local port 7890 is not connected. Compare the two settings and find that they are the same.
2. But I always think it’s a setting problem. Later, I kept trying to find that I could just remove the check of setting proxy use the system proxy
I guess the local proxy settings of the pot.
The error reporting interface of Python is shown in the following figure:
. I found a solution on the Internet, which may be useful to you. But I tried it, but it didn’t work. So when I looked at it, I found that it was caused by my carelessness. Ah, as shown in the figure below, there is a comma missing in front of longitude, as shown in the figure below:
, so this problem is solved. OK, I will continue my course design.
Today, I changed my win10 64 computer, and when I installed Python 3.6.8, I reported an error: error writing to file
During installation, right click to run as administrator, and the installation is successful.
Reproduced in: https://www.cnblogs.com/shuaishuaidefeizhu/p/10196882.html
Contents of articles
Solutions for error reporting
abstract
Pymysql connect to MySQL reported an error of keyerror255. Recently, I was trapped for more than two months by a difficult problem. If you search this title, you can see that the search engine has provided n ^ 2 articles on solutions. Why do you still trap me for so long?Don’t I know Baidu?NO NO NO！！ The biggest problem is that my executive computer and data storage computer are not the same computer!!
Error information
File "D:\Programfiles\Anaconda3\lib\site-packages\pymysql\connections.py", line 1269, in _get_server_information
self.server_charset = charset_by_id(lang).name
File "D:\Programfiles\Anaconda3\lib\site-packages\pymysql\charset.py", line 38, in by_id
return self._by_id[id]
KeyError: 255
The main reason is that MySQL 8.0 updates many character sets, but these character sets are longer than 255 , so the old version of pymysql does not support characters longer than 255
Online can find a lot of articles to solve this problem, consistent solution, update pymysql
pip install --upgrade pymysql
The following casually put a, interested can see, don't look also doesn't matter, full text summary on a sentence update pymysql, directly execute the above update code, if solve, OK! All is well, you can quit, but you can't solve it. The link article is not meaningful. Let's continue to read my text
Django appears after changing the default database SQLite3 to pymsql Keyerror:255 How to upgrade pymysql
Solution
As mentioned before, my executive computer and data storage computer are not the same computer!!
My own computer is mysql5.7, and the data storage computer version is 8.1
because at the beginning, the company's network security was upgraded to a secondary level, and then the company's intranet VPN was updated once (big exchange, the interface is different),
so at the beginning, I thought it was caused by the network security policy,
after all, all the online updates are pymysql, I'm already up-to-date and can't update any more
In fact, the solution is in a word, too lazy to beat around the bush so many words
uninstall and reload MySQL
yes! You're right! Is the MySQL database to unload, and then re install a version of 8.0 and above
So the main reason is that at the beginning MySQL 8.0 has updated many character sets, but the length of these character sets exceeds 255
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