Programmer Group

Title Description Topic 1: we all know Fibonacci series. Now you need to input an integer n. please output the nth item of Fibonacci series. N<=39 Topic 2: a frog can jump up one or two steps at a time. Find out how many ways the frog can jump to an n-level step. Experimental platform: Niu Ke LAN Topic 1 On niu ...

Objectives: Send the supplier extension list separated from the last note to the email address of different suppliers in the form of attachment. The code test sends an email every second   The code is as follows     #!/usr/bin/env python # coding: utf-8 # In[49]: import smtplib from email import encoders from email.header imp ...

Second Brother, the one you wrote before I'll switch The article is so interesting that after reading it, you still haven't finished. Would you like to write another one?Although using Java 13 syntax, it is not very friendly to older versions.But who can guarantee that Java won't get another major update, like Java 8, that Java 6 will be s ...

Using python for image processing, now you need to read out any area of the image and convert it into a one-dimensional array, which is convenient for subsequent convolution operation. There are two ways to do this: convert function from PIL import Image import numpy as np import matplotlib.pyplot as plt def ImageToMatrix( ...

How to generate apk signature key file # Build key method: sub='/C=CN/ST=ShangHai/L=ShangHai/O=example/OU=CM/CN=example/emailAddress=buildfarm@example.com' for key in platform shared media testkey;do ./development/tools/make_key $key "$sub" done How to re sign an apk The command is as follows: java -Xmx2048m -ja ...

Concept of decorator Decorator is a function often used in the process of program development. If you use decorator well, the development efficiency will be enhanced Function of decorator Introduce the functions of log, function execution time statistics, function preparation before execution, function cleaning afte ...

The second day of GO learning, today I mainly learned some data types of GO. The common data types of go are as follows 1 int (int, int8, int16, int32, int64) 2 float (float32, float64) 3 string 4 byte 5 bool 6 array 7 slice 8 map 9 channel 10 interface 11 strcut Common data types ...

Brief introduction matplotlib library is one of the libraries in Python data mining, which is mainly used for 2D drawing, simple 3D drawing and data visualization. Python data mining related extension library Simple use (1) Draw a straight line Line y=x+10 Code: def print_line_draw(): """ //Draw straight lines ...

I heard that the resume requires 100000 lines of code experience. So I wrote a Python script to calculate the number of lines of code in the computer disk. Main functions: ① Count the total number of lines of the specified code ② Count the individual lines of each code ③ Custom settings storage path Design idea: Convert t ...

concurrent.futures thread pool / process pool memory management cause In the past, there was a need for a crawler task. A machine with 1G memory ran a crawler and crawled the data of a website. Previously, this method was used: futures = list() with ThreadPool(max_workers=20) as exc: for tr in table.selec ...