{"id":1137,"date":"2024-02-24T10:54:36","date_gmt":"2024-02-24T10:54:36","guid":{"rendered":"https:\/\/learnpython.elegantwallp.com\/?p=1137"},"modified":"2024-02-24T10:54:37","modified_gmt":"2024-02-24T10:54:37","slug":"python-modules-2","status":"publish","type":"post","link":"https:\/\/learnpython.elegantwallp.com\/2024\/02\/24\/python-modules-2\/","title":{"rendered":"Python\u00a0Modules"},"content":{"rendered":"\n

What is a Module?<\/h2>\n\n\n\n

Consider a module to be the same as a code library.<\/p>\n\n\n\n

A file containing a set of functions you want to include in your application.<\/p>\n\n\n\n

\n\n\n\n

Create a Module<\/h2>\n\n\n\n

To create a module just save the code you want in a file with the file extension .py<\/code>:<\/p>\n\n\n\n

ExampleGet your own Python Server<\/h3>\n\n\n\n

Save this code in a file named mymodule.py<\/code><\/p>\n\n\n\n

def greeting(name):
  print(\"Hello, \" + name)<\/code><\/pre>\n\n\n\n
Use a Module<\/h2>\n\n\n\n
Now we can use the module we just created, by using the import<\/code> statement:<\/p>\n\n\n\n
Example<\/h3>\n\n\n\n
Import the module named mymodule, and call the greeting function:<\/p>\n\n\n\n
import\u00a0mymodule

mymodule.greeting(\"Jonathan\")<\/code><\/pre>\n\n\n\n
Note:<\/strong> When using a function from a module, use the syntax: module_name.function_name<\/em>.<\/p>\n\n\n\n
\n\n\n\n
Variables in Module<\/h2>\n\n\n\n
The module can contain functions, as already described, but also variables of all types (arrays, dictionaries, objects etc):<\/p>\n\n\n\n
Example<\/h3>\n\n\n\n
Save this code in the file mymodule.py<\/code><\/p>\n\n\n\n
person1 = {
  \"name\": \"John\",
  \"age\": 36,
  \"country\": \"Norway\"
}<\/code><\/pre>\n\n\n\n
Example<\/h3>\n\n\n\n
Import the module named mymodule, and access the person1 dictionary:<\/p>\n\n\n\n
import\u00a0mymodule

a = mymodule.person1[\"age\"]
print(a)<\/code><\/pre>\n\n\n\n
\n\n\n\n
\n\n\n\n
Naming a Module<\/h2>\n\n\n\n
You can name the module file whatever you like, but it must have the file extension .py<\/code><\/p>\n\n\n\n
Re-naming a Module<\/h2>\n\n\n\n
You can create an alias when you import a module, by using the as<\/code> keyword:<\/p>\n\n\n\n
Example<\/h3>\n\n\n\n
Create an alias for mymodule<\/code> called mx<\/code>:<\/p>\n\n\n\n
import mymodule as mx

a = mx.person1[\"age\"]
print(a)<\/code><\/pre>\n\n\n\n
\n\n\n\n
Built-in Modules<\/h2>\n\n\n\n
There are several built-in modules in Python, which you can import whenever you like.<\/p>\n\n\n\n
Example<\/h3>\n\n\n\n
Import and use the platform<\/code> module:<\/p>\n\n\n\n
import\u00a0platform\n\nx = platform.system()\nprint(x)\n\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
Using the dir() Function<\/h2>\n\n\n\n
There is a built-in function to list all the function names (or variable names) in a module. The dir()<\/code> function:<\/p>\n\n\n\n
Example<\/h3>\n\n\n\n
List all the defined names belonging to the platform module:<\/p>\n\n\n\n
import\u00a0platform

x =\u00a0dir(platform)
print(x)<\/code><\/pre>\n\n\n\n
Note:<\/strong> The dir() function can be used on all<\/em> modules, also the ones you create yourself.<\/p>\n\n\n\n
\n\n\n\n
Import From Module<\/h2>\n\n\n\n
You can choose to import only parts from a module, by using the from<\/code> keyword.<\/p>\n\n\n\n
Example<\/h3>\n\n\n\n
The module named mymodule<\/code> has one function and one dictionary:<\/p>\n\n\n\n
def greeting(name):
  print(\"Hello, \" + name)

person1 = {
  \"name\": \"John\",
  \"age\": 36,
  \"country\": \"Norway\"
}<\/code><\/pre>\n\n\n\n
Example<\/h3>\n\n\n\n
Import only the person1 dictionary from the module:<\/p>\n\n\n\n
from\u00a0mymodule\u00a0import\u00a0person1

print\u00a0(person1[\"age\"])<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
What is a Module? Consider a module to be the same as a code library. A file containing a set of functions you want to include in your application. Create a Module To create a module just save the code you want in a file with the file extension .py: ExampleGet your own Python Server Save […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[107],"tags":[],"class_list":["post-1137","post","type-post","status-publish","format-standard","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/1137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/comments?post=1137"}],"version-history":[{"count":1,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/1137\/revisions"}],"predecessor-version":[{"id":1138,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/posts\/1137\/revisions\/1138"}],"wp:attachment":[{"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/media?parent=1137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/categories?post=1137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/learnpython.elegantwallp.com\/wp-json\/wp\/v2\/tags?post=1137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}