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1. To judge whether each letter in a string is in another string, we can use the characteristics of the set to solve the problem. If the elements of the set exist, it is impossible to add the update to the set again. Then the length of the set is the same as before. If you add it, the length of the set will increase >>> a = 'ghost' ...

The following example code applies to www.apishop.net For the API under the website, you need to apply for the corresponding API service before using the interface call code examples mentioned in this article. Coach query Long distance bus time query and bus station query in major cities in China Vehicle Daquan : in ...

The Translate ToolKit 2.5.0 API is a document conversion tool for the translation industry. For example, convert json or html to PO file for translation. Here, we use the Flask web framework to implement the basic functions of the Translate ToolKit api. This is a written test of the previous few days. It requires three days to implement a webAp ...

1.time module import time s = time.localtime() # Convert the time into the formatted time, and obtain the struct time format such as mm / DD / yyyy through time.struct_time(tm_year=2018, tm_mon=3, tm_mday=11, tm_hour=19, tm_min=53, tm_sec=31, tm_wday=6, tm_yday=70, tm_isdst=0) s=time.gmtime() #UTC time zone s=time.time() # Returns the cur ...

python data analysis personal study reading notes - Catalog Index Chapter 4 statistics and linear algebra Statistics and linear algebra lay the foundation for exploratory data analysis. Both descriptive and inferential statistical methods are helpful to obtain insights and inferences from the original data. For example, after calculating the ...

Definition: Function in essence (decorate other functions), is to add additional functions for other functions Principle: The source code of the decorated function cannot be modified Cannot modify the call mode of decorated function   Realize knowledge reserve of decorators: Functions and "variables" Higher order function Pas ...

Article directory 1. Set up Windows Wallpaper with Python 2. Randomly switch Windows Wallpaper 3. Switch Windows wallpaper regularly In modern history, every year of gengzi was unusual: the Opium War in 1840, the invasion of China by the Allied forces of eight countries in 1900, and the famine in 1960. A novel coronavirus e ...

sklearn.datasets module mainly provides some methods of importing, downloading online and generating datasets locally. You can view them through dir or help command. We will find that there are three main forms: load ＜ dataset  name >, fetch ＜ dataset  name > and make ＜ dataset  ① Datasets. Load ＜ datasets ﹤ name >: small datas ...

I often use SQL in my work, which has annoying subtle differences and limitations, but after all, it is the cornerstone of the data industry.Therefore, SQL is indispensable to every data worker.Being proficient in SQL means a lot. SQL is good, but how can you just be satisfied with "good"?Why not proceed further with SQL? Statements c ...

1. numpy scientific computing base 1.1 what is numpy NumPy(Numerical Python) is an extension library of Python language, which supports a large number of dimension arrays and matrix operations. In addition, it also provides a large number of mathematical function libraries for array operations. NumPy's predecessor, Numeric, was first developed ...