Python

Python Calculate quantitative strategy evaluation index

Quantitative evaluation of annualized rate of return （ Daily yield , Weekly yield , Monthly yield ） Converted to the adult rate of return , It's a...
2019-09-09 17:40 views 100

python Read from the specified directory Excel Table all sheet Data

Recently, I want to try to make an interface automation script , First, you need to read data from the file , I updated an article a long time ago...
2019-08-31 23:01 views 20

Statistics JIRA System current bug situation

# coding: utf-8# subject: accumulate total bug-count and bug-count in a week.import reimport jsonimport timefrom functools import reducefrom dateti...
2019-08-28 18:25 views 18

cv2.error: OpenCV(4.1.0) C:\projects\opencv-python\opencv\modules\imgproc\src\segmentation.cpp:161:

Problem description in the use of watershed segmentation , This common error was found kernel = np.ones((3, 3), np.uint8)sure_bg = cv.dilate(water...
2019-08-23 18:03 views 1399

ValueError: Shape of passed values is (6, 3), indices imply (6, 6)

He needs it 6 column 6 that 's ok , But it was only given 6 column 3 that 's ok . In general, look at your own creation dataframe Is there any mis...
2019-08-22 13:18 views 184

Python Snake simple code

In self-study Python In the process of searching information on the Internet, I found some interesting things ,python Game library module of , It ...
2019-08-07 09:17 views 31

python Method of generating random string -random modular

Method 1 , Upper and lower case letters + number ：import randomimport string ran_str = ''.join(random.sample(string.ascii_letters + string.digits...
2019-08-06 15:26 views 46

Python Classical basic programming exercises （ One ）—— everyday 10 topic

1. There are four numbers here , namely ：1,2,3,4, How many distinct three digit numbers can be formed without repeating numbers ? Please list them ...
2019-08-03 11:08 views 28

Python The usage of slicing in Chinese

stay Python in , Slices are lists , Common usage in tuples or strings , However, for some beginners , Sometimes the readability of code with slice...
2019-08-02 20:21 views 14

Python Basic examination and answers

One . choice question （ Each question 1 branch , common 20 branch ） Which of the following statements is in the Python It's illegal in China ? （ ...
2019-07-25 18:41 views 41
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