Python study notes - writing help documents for custom classes or functions, and conducting document testing

In python we can use help("module name") or help(class name) to view the documentation of a class or function. But how are they written? In fact, they use """ three double quotes to wrap multiple lines of comments at the beginning of the class or the method. These contents will be regarded as help documents by Python.

What content is generally written in the help document? It mainly includes the following content:

##The main function of this class or function

##Incoming values ​​and output values

Instructions for some special situations

Document test content

The above content is a personal summary, but I have not seen relevant information

Let’s give an example:

class Apple(object):
""" This is an Apple Class"""
def get_color(self):
"""
Get the Color of Apple.
get_color(self) -> str
"""
return "red"

Enter

>>> from CallDemo import Apple
>>> help(Apple)
Help on class Apple in module CallDemo:
class Apple(__builtin__.object)
| This is an Apple Class
| 
 | Methods defined here:
| 
 | get_color(self)
| Get the Color of Apple.
| get_color(self) -> str
| 
 | ----------------------------------------------------------------------
| Data descriptors defined here:
| 
 | __dict__
| dictionary for instance variables (if defined)
| 
 | __weakref__
| list of weak references to the object (if defined)

Use doctest for document testing in the python terminal

We can also use the doctest module for document testing in the comments.

#For example, after we add the document test content, it looks like this:

class Apple(object):
"""
This is an Apple Class
Example:
>>> apple = Apple()
>>> apple.get_color()
'red'
>>> apple.set_count(20)
>>> apple.get_count()
400
"""
def get_color(self):
"""
Get the Color of Apple.
get_color(self) -> str
"""
return "red"
def set_count(self, count):
self._count = count
def get_count(self):
return self._count * self._countif __name__ == '__main__':
import doctest

doctest.testmod()

Because we wrote

if __name__ == '__main__':
import doctest
doctest.testmod()

So the above document test will only be performed when executing with the entry file, so it will not be executed in actual application.

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