Customization is needed Mr.ram.a.dayinaboyina…………… for each and every discussion
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:
Save this code in a
file named mymodule.py
def greeting(name):
print("Hello,
" + name)
Use a Module
Now we can use the module we just
created, by using the import statement:
Example
Import the module
named mymodule, and call the greeting function:
import mymodule
mymodule.greeting("Jonathan")
Note: When using a
function from a module, use the syntax: module_name.function_name.
Variables in Module
The module can contain functions, as
already described, but also variables of all types (arrays, dictionaries,
objects etc):
Example
Save this code in the
file mymodule.py
person1
= {
"name": "John",
"age": 36,
"country": "Norway"
}
Example
Import the module
named mymodule, and access the person1 dictionary:
import mymodule
a = mymodule.person1["age"]
print(a)
Naming a Module
You can name the module file whatever
you like, but it must have the file extension .py
Re-naming a Module
You can create an alias when you import
a module, by using the as keyword:
Example
Create an alias
for mymodule called mx:
import mymodule as mx
a = mx.person1["age"]
print(a)
Built-in Modules
There are several built-in modules in
Python, which you can import whenever you like.
Example
Import and use
the platform module:
import platform
x = platform.system()
print(x)
Using the dir()
Function
There is a built-in function to list
all the function names (or variable names) in a module. The dir() function:
Example
List all the defined
names belonging to the platform module:
import platform
x = dir(platform)
print(x)
Note: The dir() function can be used on all modules,
also the ones you create yourself.
Import From Module
You can choose to import only parts
from a module, by using the from keyword.
Example
The module
named mymodule has one
function and one dictionary:
def greeting(name):
print("Hello,
" + name)
person1 = {
"name": "John",
"age": 36,
"country": "Norway"
}
Example
Import only the
person1 dictionary from the module:
from mymodule import person1
print (person1["age"])