from pprint import pprint
print(f"{'=' * 20}")
print(f"Running main.py module name {__name__}")
# __main__ is the starting point of wherever module we start
# The code for module1 does not happen untill this import. Execs the code and puts it into the sys.modules cache
import module1
# The pprint_dict will be part of the module1 globals which prints when we import module1
print(module1)
module1.pprint_dict('main.globals', globals())
import sys
pprint(sys.path)
# Print the system module cache
pprint(sys.modules)
# Importing modules multiple times does nothing as they are already in the sys.modules cache
# None of the module1 code will be run
import module1
import module1
del globals()['module1']
# module1 no longer in the namespace, the module is still in memory and is referenced
# by the sys.modules cache
# it's in cache but not in the global namespace
import module1
# The reference is brought back into the globals but the code isn't run again
module1.pprint_dict('main.globals', globals())
print(f"{'=' * 20}")
print("===============================")
print("Running main.py - module name: {0}".format(__name__))
import module1
print(module1)
module1.pprint_dict("main.globals", globals())
print("IMPORTING module1 again.."
) #it wont import module1 again, it would first look into sys.modules
import module1
print("===============================")
import sys
print('=================================================\n\n')
print('---- Running Main.py.. Module name {0} ----'.format(__name__))
import module1
print('Main.globals: ', module1.pprint_dict('main.globals()', globals()))
# Python compiler looks for the imports in this sys.path
print('System_paths:\n', sys.path)
print('Where is module1:', sys.modules['module1'])
print('\n\n=================================================')
print('\n\n********************** Delete a Module *************************')
del globals()['module1']
import sys
# print(sys)
# print(sys.prefix)
# print(sys.path)
print("=========================================")
print(f"Running main.py - module name {__name__}")
import module1
print(module1)
# module1.pprint_dict("main.globals", globals())
print(sys.path)
print(sys.modules['module1'])
del globals()["module1"]
import module1 # после удаления модуля, нужно заново его импортировать
print(globals())
module1.pprint_dict("globals", globals()) # после удаления функция не работает
print("=========================================")
# print(sys.modules)