Step function The step function is simple, it gets only two values zero or one no matter what the input value is. #!/usr/bin/env python import numpy as np import matplotlib.pylab as plt def step_function(x): return np.array(x>0, dtype=np.int) if __name__ == ‘__main__’: x = np.arange( -5, 5, 0.1 ) y = Read more…
The article introduces how to collect Chinese idioms on the Internet by python. I chose a website that contains many Chinese idioms, http://cy.5156edu.com , to do the experiments. We have to make sure the library BeautifulSoup installed for Python firstly, it can help us to analyze the web page. Maybe Read more…
The article introduces a way to reduce the size of the gif file. The python script analysis gif file and generate many png files from multiple frames. Then it takes a few png files to combine a new smaller gif file. In addition, You can use OpenCV to convert the Read more…
I want to combine all png files to a single PDF file. The following python script can make this task simpler. If you want to use the script, please make sure python can be installed and folder path and pdf file are correct. #! /usr/local/bin/python3 # -*- coding: utf-8 -*- Read more…
Email is used in our working frequently, we have to send emails to different people, it is too boring to send similar content to different friends manually. Python can help us to handle the task successfully, we need to use the library smtplib and email.mime.text. I use my sina account Read more…
Almost every developer know how to implement the bubble sort for a simple array. We just need to travel over the array in two levels and swap the adjacent elements in the second level if their values’ order is not correct. The algorithm implement with Python is in the following Read more…
Read a single txt file and indent every paragraph. myReader.py def getText( filePath ): with open( filePath ) as file: content = file.read() paragraphs = content.split( ‘\n’ ) file.close() newContent = “” for para in paragraphs: newContent = newContent + ” ” + para + “\n” return newContent main.py import Read more…
The article shows a few simple examples which use python to edit PDF. Copy And Encrypt PDF Just copy an existing PDF and generate a new file which is encrypted import PyPDF2 fileName = “/Users/weiyang/Desktop/Test.pdf” newFileName = “/Users/weiyang/Desktop/NewTest.pdf” file = open( fileName, ‘rb’ ) reader = PyPDF2.PdfFileReader( file ) writer Read more…
I wrote some simple examples about handling excel with python in article Read Excel Table With Python. Now let’s deal with a more complex task, to combine two different tables based on a common column. Sheet0 Sheet1 Above two tables have the common column, 编号，the number of rows in sheet0 Read more…