Python Programming – Import
It is a good practice to break large programs into modules, which makes it easy for the programmer to understand each module separately rather than the whole program at once. A module is a file that contains definitions and statements of Python functions. Python modules have a filename that terminates with the extension .py.
Alike, C, C++, and Java, the definitions inside a module can be imported to another module or the interactive interpreter in Python, where header files and namespaces are used in C/C++/Java. We use the import keyword in Python to achieve this. For example, we can import the math module by typing in import math as shown in Code 2.31.
Code: 2.31.
| >>> import math >>>math.pi 3.141592653589793 |
- Python Programming – Import Model
- Python Programming – Python Modules
- Python Programming – Types Of Functions
Now all the definitions inside the math module are available for our use. We can also import some specific attributes and functions only, using the form of a keyword, see Code 2.32for example.
Code: 2.32.
| >>> from math import pi >>> pi 3.141592653589793 |
While importing a module. Python looks at several places defined in sys. path for importing all the methods in that module as shown in Code: 2.33., the output for the same is shown in Fig. 2.3., which represents a list of directories.
Code: 2.33.
| >>> import sys >>>sys.path |
