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How to find which Python modules are being imported from a package?
A file containing Python code, definitions of statements, functions, or classes is known as a module. A module with the name "module" that we will construct is a file named module.py.
To break down complex programmes into smaller, easier-to-understand parts, we use modules. Code reuse is another benefit of modules.
In this article, we will discuss various ways to find which Python modules are being imported from a package.
Using List Comprehension
To iterate over each element in the Python list, a list comprehension is made out of brackets carrying the expression, which is then run for each element.
Python List comprehension offers a much shorter syntax for creating a new list from the elements of an existing list.
Example
The following example returns all imported local module names by default in an unsorted list using the sys library with List Comprenehsion.
Using __name__ (also known as a dunder), this code iterates through sys.modules.values() to check if an item is a locally scoped module. If so, ‘output’ is saved with the module name. For readability, this code arranges the ‘output’ variable and saves it back to itself. List formatted output of these ‘output’ is sent to the terminal.
import sys output = [module.__name__ for module in sys.modules.values() if module] output = sorted(output) print('The list of imported Python modules are :',output)
Output
Following is an output of the above code −
The list of imported Python modules are : ['__main__', '_bootlocale', '_codecs', '_collections', '_functools', '_heapq', '_imp', '_locale', '_operator', '_signal', '_sitebuiltins', '_stat', '_sysconfigdata_m_linux_x86_64-linux-gnu', '_thread', '_warnings', '_weakref', '_weakrefset', 'abc', 'builtins', 'codecs', 'collections', 'collections.abc', 'collections.abc', 'contextlib', 'encodings', 'encodings.aliases', 'encodings.latin_1', 'encodings.utf_8', 'errno', 'functools', 'genericpath', 'heapq', 'importlib', 'importlib._bootstrap', 'importlib._bootstrap', 'importlib._bootstrap_external', 'importlib._bootstrap_external', 'importlib.abc', 'importlib.machinery', 'importlib.util', 'io', 'io', 'itertools', 'keyword', 'marshal', 'mpl_toolkits', 'operator', 'os', 'posix', 'posixpath', 'posixpath', 'reprlib', 'site', 'stat', 'sys', 'sysconfig', 'types', 'warnings', 'weakref', 'zipimport']
Using pip freeze command
This function shows a list of all names and versions of imported global modules, by default arranged alphabetically.
Example
Enter the below command by opening the terminal window in an IDE. In order to execute, press the Enter key −
C:\Users\Lenovo>pip freeze
Output
The terminal receives the output −
aspose-cells==22.7.0 click==8.1.3 cloudpickle==2.1.0 colorama==0.4.5 dask==2022.7.0 et-xmlfile==1.1.0 fsspec==2022.5.0 genno==1.11.0 ixmp==3.5.0 JPype1==1.4.0 llvmlite==0.38.1 locket==1.0.0 message-ix==3.5.0 modcall==0.1.0 mysql-connector-python==8.0.29 namespace==0.1.4 native==0.0.0.0a0.dev20210615 numba==0.55.2 numpy==1.22.4 openpyxl==3.0.10 packaging==21.3 pandas==1.4.3 partd==1.2.0 Pint==0.19.2 protobuf==4.21.2 psycopg2==2.9.3 pycparser==2.21 pyparsing==3.0.9 python-dateutil==2.8.2 python-dotenv==0.20.0 python-magic==0.4.27 pytz==2022.1 PyYAML==6.0 scipy==1.9.1 six==1.16.0 sparse==0.13.0 toolz==0.12.0 walk==0.3.5 workbook==1.1 xarray==2022.3.0 xlrd==2.0.1 xlutils==2.0.0 xlwt==1.3.0
Using dir() method
The dir() function returns all of the given object's properties and methods, but not their related values. This function will even return built-in attributes that are the default for all objects.
Example
The dir() method is used in the following example to return a sorted list of all local module names −
module = dir() print('The list of imported Python modules are :',module)
Output
The output shown below demonstrate that this script only shows names relevant to our local scope −
The list of imported Python modules are : ['__annotations__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__']
Using inspect.getmember() and a Lambda
A number of helpful functions are offered by the inspect module to help in gathering data on active objects such modules, classes, methods, functions, tracebacks, frame objects, and code objects. It can assist you in examining a class's contents, retrieving a method's source code, extracting and formatting a function's argument list, or gathering all the data required to display a detailed traceback, among other things.
An anonymous, short function is known as a lambda. Although a lambda function can have only one expression, it can have any number of arguments.
Example
The following example returns the imported local modules in a sorted format using inspect.getmember() and a Lambda.
The names of the imported local modules and where they are located on the system are returned by this code as an iterable object. This is iterated through and printed as one line using a for loop.
import inspect import os modules = inspect.getmembers(os) results = filter(lambda m: inspect.ismodule(m[1]), modules) for o in results: print('The list of imported Python modules are :',o)
Output
Following is an output of the above code −
The list of imported Python modules are : ('abc', <module 'abc' from '/usr/lib64/python3.6/abc.py'>)
The list of imported Python modules are : ('errno', <module 'errno' (built-in)>)
The list of imported Python modules are : ('path', <module 'posixpath' from '/usr/lib64/python3.6/posixpath.py'>)
The list of imported Python modules are : ('st', <module 'stat' from '/usr/lib64/python3.6/stat.py'>)
The list of imported Python modules are : ('sys', <module 'sys' (built-in)>)
Using sys module
The sys.modules dict can be used to discover all the Python modules from a specific package that are being utilised by an application. A dictionary that links module names to modules is called sys.modules. To see imported modules, you can look at its keys.
Example
Following is an example to find the imported modules from a package using sys module
from datetime import datetime import sys print (sys.modules.keys())
Output
Following is an output of the above code −
dict_keys(['builtins', 'sys', '_frozen_importlib', '_imp', '_warnings', '_thread', '_weakref', '_frozen_importlib_external', '_io', 'marshal', 'posix', 'zipimport', 'encodings', 'codecs', '_codecs', 'encodings.aliases', 'encodings.utf_8', '_signal', '__main__', 'encodings.latin_1', 'io', 'abc', '_weakrefset', '_bootlocale', '_locale', 'site', 'os', 'errno', 'stat', '_stat', 'posixpath', 'genericpath', 'os.path', '_collections_abc', '_sitebuiltins', 'sysconfig', '_sysconfigdata_m_linux_x86_64-linux-gnu', 'types', 'functools', '_functools', 'collections', 'operator', '_operator', 'keyword', 'heapq', '_heapq', 'itertools', 'reprlib', '_collections', 'weakref', 'collections.abc', 'importlib', 'importlib._bootstrap', 'importlib._bootstrap_external', 'warnings', 'importlib.util', 'importlib.abc', 'importlib.machinery', 'contextlib', 'mpl_toolkits', 'datetime', 'time', 'math', '_datetime'])
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