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In the actual development process , You will often encounter many identical or very similar operations , At this time , Code that implements similar operations can be encapsulated as functions , Then call the function where you need it . This can not only realize code reuse , It can also make the code more organized , Increase code reliability . Now let's introduce python The function package of .
In order to organize the modules , Usually, multiple modules are placed in one directory . We will Python The directory where the module files are located is called package , And there must be __init__.py file （ The content of the file can be empty ）.
It has the following package structure ：
package_1
|—— init.py
|—— module_1.py
|—— module_2py
|—— module_3py
main.py
for example ： If main.py Want to call package_1 Module in package module_1 Medium f() function ：
import package_1.module_1 # The import module
package_1.module_1.f() # Call function
# You can also use the following statement to implement
from package_1 import module_1 # The import module
module_1.f() # Call function
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