Python 3.4: the only release to create .EXE standalone without .dll

[snippsat]

Just done, unsuccessfully (many .dll's) with 3.5.1 version, as follows, and I have some doubts that something changes with 3.7.

Had you look at my run in my previous post.

pyinstaller --onefile --console power.py

Is the same as @Axel_Erfurt postet so -F is the same as --onefile.

Upgrade your Python version,do not use Python 3.4 anymore.
Python 3.6/3.7 and pip installation under Windows
A carrot for upgrade is that you can use f-string.

>>> print(f"Sammy has {4:4} red and {16:16}! blue balloons")
Sammy has    4 red and               16! blue balloons
 
>>> # f-strings support any Python expressions inside the curly braces
>>> name = 'f-string'
>>> print(f"My cool string is called {name.upper()}.")
My cool string is called F-STRING.
 
>>> a, b = 5, 7
>>> f'{a}/{b} = {a/b:.2}'
'5/7 = 0.71'
 
>>> for word in 'f-strings are awesome'.split():
...     print(f'{word.upper():~^20}')
~~~~~F-STRINGS~~~~~~
~~~~~~~~ARE~~~~~~~~~
~~~~~~AWESOME~~~~~~~