What is the order in which Python packages are introduced?

the file structure is as follows:

$ tree .
.
 main.py
 os.py
 platform.py

main.py:

import platform
import os
import sys
print("Now in main, Start`enter code here` to Exec following")
print(os.getcwd())
print(sys.modules["platform"].__file__)
print(platform.processor())

os.py:

print("Now in os.py module")

platform.py:

print("Now in platform.py module")

when I run python main.py , the result is as follows:

$ python main.py
Now in platform.py module
Now in main, Start to Exec following
/Users/michael/Code/00-Temp/pkg_import
/Users/michael/Code/00-Temp/pkg_import/platform.py
Traceback (most recent call last):
  File "main.py", line 9, in <module>
    print(platform.processor())
AttributeError: module "platform" has no attribute "processor"

question 1: os and platform are both built-in modules. When import os , they go to the built-in module by default, but import platform gets the plarform in the same directory. Why does this happen?

question 2: for the same script, I ran main.py directly in Pycharm, but reported this error:

/Users/michael/anaconda3/bin/python /Users/michael/Code/00-Temp/pkg_import/main.py
Now in os.py module
Fatal Python error: initsite: Failed to import the site module
Traceback (most recent call last):
  File "/Users/michael/anaconda3/lib/python3.7/site.py", line 570, in <module>
    main()
  File "/Users/michael/anaconda3/lib/python3.7/site.py", line 547, in main
    known_paths = removeduppaths()
  File "/Users/michael/anaconda3/lib/python3.7/site.py", line 126, in removeduppaths
    dir, dircase = makepath(dir)
  File "/Users/michael/anaconda3/lib/python3.7/site.py", line 91, in makepath
    dir = os.path.join(*paths)
AttributeError: module "os" has no attribute "path"

Process finished with exit code 1

import sys print(sys.modules) import platform import os print('Now in main, Start`enter code here` to Exec following') print(os.getcwd()) print(sys.modules['platform'].__file__) print(platform.processor())