# Demo Android 11 shared and app-specific storage.
# Storages differ, and folders differ from files.
# This was run in Termux on an Android-11 Z Fold3.


# SHARED STORAGE

>>> import os, glob
>>> nonport = ' \x00 / \\ | < > ? * : " '.replace(' ', '')
>>>
>>> os.chdir('/sdcard')
>>> for c in '_' + nonport + '^':
...     try:
...         name = 'temp' + c + '.txt'
...         n = open(name, 'w').write('spam')
...     except Exception as E:
...         print(name, 'FAIL', E.__class__.__name__, E)
...     else:
...         print(name, 'okay')
...
temp_.txt okay
temp.txt FAIL ValueError embedded null byte
temp/.txt okay
temp\.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp\\.txt'
temp|.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp|.txt'
temp<.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp<.txt'
temp>.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp>.txt'
temp?.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp?.txt'
temp*.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp*.txt'
temp:.txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp:.txt'
temp".txt FAIL PermissionError [Errno 1] Operation not permitted: 'temp".txt'
temp^.txt okay
>>>
>>> os.mkdir('temp|dir')
>>> glob.glob('temp*')
['temp', 'temp_.txt', 'temp^.txt', 'temp|dir']


# APP-SPECIFIC STORAGE

>>> os.chdir('/sdcard/Android/data/com.termux')
>>> for c in '_' + nonport + '^':
...     try:
...         name = 'temp' + c + '.txt'
...         n = open(name, 'w').write('spam')
...     except Exception as E:
...         print(name, 'FAIL', E.__class__.__name__, E)
...     else:
...         print(name, 'okay')
...
temp_.txt okay
temp.txt FAIL ValueError embedded null byte
temp/.txt FAIL FileNotFoundError [Errno 2] No such file or directory: 'temp/.txt'
temp\.txt okay
temp|.txt okay
temp<.txt okay
temp>.txt okay
temp?.txt okay
temp*.txt okay
temp:.txt okay
temp".txt okay
temp^.txt okay
>>>
>>> os.mkdir('temp|dir')
>>> glob.glob('temp*')
['temp_.txt', 'temp\\.txt', 'temp|.txt', 'temp<.txt', 'temp>.txt', 'temp?.txt', 'temp*.txt', 'temp:.txt', 'temp".txt', 'temp^.txt', 'temp|dir']