Python Tutorial

In this article, i will show you how to use python regular expression module ( python re module ) to parse a string to return the first matched string and all matched strings.

Pymongo is a popular mongo database python driver library. We can use it to manage the mongo database. In this article, I will show you how to install pymongo library and how to use pymongo to connect to the mongo database. It also tells you how to create a mongo database and collection in python

When I develop a python program in the eclipse Pydev project, I need to import a package pymongo into this python program like the below source code. import pymongo if __name__ == ‘__main__’: pass But it shows an error message Unresolved import: pymongo in the source code, you can see this error message when you move

When i start mongo db on macOS console by run command mongod, i got below error message. {“t”:{“$date”:”2020-09-09T10:45:30.049+08:00″},”s”:”E”,  “c”:”NETWORK”,  “id”:23024,   “ctx”:”initandlisten”,”msg”:”Failed to unlink socket file”,”attr”:{“path”:”/tmp/mongodb-27017.sock”,”error”:”Permission denied”}}

In this article i will show you an example about how to implement progress bar in python console. It is useful when you write some python console program.

When you run print(‘ hello python ‘) in python code, it always print the text on screen, this is because python standard output is screen console. But we always want to print the text to a file instead of screen console, especially print exception error messages when exception occurred in python source code.

When I execute a system program using the python subprocess module’s run method in windows, I meet an error message like below.