Python-learn Note (3)

The Python module

A package is a folder, and a package can have multiple levels;

modules are xxx.py files, you can create your own modules, and import them, the module name is the same as the name of the file;

Python imports a module using the import statement.

Import Math
Print math.sqrt (+) # = 4

Only a few functions of the math module that you want to import

From math import ceil, floor
Print Ceil (3.7) # = 4.0
Print floor (3.7) # = 3.0

# import all definitions from the module
# Warning: deprecated
From Math Import *

Using the From...import import function Sometimes causes conflicts of the same name. At this point, you can give the function an " alias" to avoid conflicts ;

From math import logfrom logging import log as Logger   # logging log now becomes Loggerprint log (   s) # called the lo of math Glogger (' Import from logging ')   # called the log of logging  

# You can also see what properties and methods are in the module using the Dir method
Import Math
Dir (Math)