python: how asynchronous tasks make web crawlers faster

1. Background In recent days, I find there is an interesting website ( It carries some free resume templates and sound effects resources, which are great in my production. It is will be very convenient if I can collect these resources automatically instead of manual download each of them. To solve the problem, these python […]

Python: Why you should choose pytest instead of unittest?

1. What is Pytest? The pytest framework makes it easy to write small, readable tests and can scale to support complex functional testing for applications and libraries. 2. Why do I choose pytest instead of unittest? Although both frameworks are great for performing testing in python. Firstly, pytest is fast, efficient, and easy to work […]

PYTHON: A data structure you should know—Dictionary

1. What is a dictionary data structure? You may hear about Hash Map in other programming languages. The same concept in python is called the dictionary. Dictionaries are used to store data values in key and value pairs. The advantage of the way key-value storing makes the search very fast especially compared to the way […]

PYTHON:  From Random Module To The Dice Game

1. Random Module In python, the function random() can not be directly called. However, we need to import a random module and generate random numbers by calling the static method. By importing this random module, it implements pseudo-random number generators for various distributions.

PYTHON: How to get factorial by recursion

1. The concept of factorial The factorial of a positive integer is the product of all positive integers less than and equal to the number, and the factorial of 0 is 1. The factorial of a natural number n is written as n!. It is invented by Christan Kramp (1760-1826) That is, n!=1×2×3×…×n. Factorials can also be […]

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