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INFO:_main_:Finish updating records WhatвЂ™s different between the вЂњprintвЂќ approach you asked. INFO:_main_:Start reading database INFO:_main_:Updating records. Thanks to Python community, logging is a standard module, it was well designed to be easy-to-use and very flexible. Use Python standard logging module So, how do you do logging correctly? ItвЂ™s easy, use the standard Python logging module. Of course you can print messages to stderr, but still, it is not a good practice to use print for logging.

And all printed messages go into stdout, which is bad when you have data to output to stdout. Read_recrods () print '# records', records print 'Updating record.' Update_records ( records ) print 'done' It works when the program is a simple script, but for complex systems, you better not to use this approach.ДЇirst of all, you cannot leave only important messages in the log, you may see a lots of garbage messages in the log, but canвЂ™t find anything useful.You also cannot control those print statements without modifying code, you may forgot to remove those unused prints. Print 'Start reading database' records = model. Following screenshot is the log file of a server. For example, when you are writing a server, logging is necessary. When a program crashes, if there is no logging record, you have little chance to understand what happened. Likewise, logging is important for system developing, debugging and running. If something goes wrong, people can read the log and has a chance to figure out what happened. When an airplane is flying, black box (flight data recorder) is recording everything. When you transfer money, there are transfer records. Good logging practice in Python 12 minute read In reality, logging is important. Of course arithmetic is important in many cases, but Python is probably more often used to manipulate text and other sorts of data, as in the sample program in. We start with the integers and integer arithmetic, not because arithmetic is exciting, but because the symbolism should be mostly familiar. If you are about to ask a 'how do I do this in python' question, please try r/learnpython or the Python discord. News about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python.

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