Every day you should work hard to improve your coding skills. Today I have brought some programming suggestions to Python novices.
Python languageOpen the Python interactive terminal and run the following command
Then the command will have some output, read it carefully because it is really important to Python programmers.
Use this command to empty your Python interactive terminal
When you use the Python interactive terminal to test the code, the content on your screen is getting more and more, and slowly it starts to affect your thinking, then you want to clear the previous output. Commanding clear on a Unix-like operating system can clear the contents of the screen.
This system command can be executed using the Python standard library os.
The following line of Python commands can empty the contents of a Python terminal on a Unix-like operating system.
The windows system can use the cls command to clear the contents of the terminal screen. Since Python's os library methods are cross-platform, the same applies to Windows, so you can clear the contents of the Python interactive terminal in Windows in the Python interactive terminal as shown below.
Be careful when creating tuples
Many people think that the following code will return a tuple. But the actual implementation only knows that it is not the case at all.
After running, the Python terminal actually returns the number 1.
Based on this result, you should easily understand that the parentheses here do not function as tuples, but merely a simple bracket.
If you want a tuple with only one element, how should you write it? Should be like this
Remember to always bring that comma when building a tuple
Test if the variable is in the correct posture of None
You might use the following code to test if the variable is None.
Do not do this. If a is 0, this if judgment cannot be resolved at all. The correct posture should be like this
Get the documentation for a Python object
Getting a documentation of a particular method or module in a Python interactive terminal is very easy, just use the help command.
Run the above command, the interactive terminal will print the document information of the os module, the output is similar to the following
This help command is especially useful in the absence of a web, and is especially convenient and fast.
Of course, you can also view the documentation for a particular method within a module like this:
As you can see from the help below, the getenv method of the os module is used to get the value of the environment variable. If the environment variable does not exist, it returns None.
Exchange variable value
Exchanging variables in Python is easier than any other language and is extremely intuitive
No matter what language you learn, practice is the best way to improve. It is also a mistake! If you have not experienced the experience of making mistakes, you never know what the right path is.
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