Add a layer with Python QGIS

Question

Through QGIS API, I would like to add some tens of vector layers to QGIS, where each layer would be a single shapefile from a folder. I would then like to print (to Python console) the coordinates of all the point features in those shapefiles.

Can that be achieved with QGIS API, but outside of QGIS (through a Python editor like PyCharm/Atom for example)?

I found an API snippet how that can be achieved, but only from inside the QGIS. Is it possible to do it from PyCharm/Atom too?

I am struggling to adapt the upper code. For example, I can't even import qgis.core module:

# coding=utf-8
import os, sys

# append QGIS Python library to python search path
sys.path.append(R"C:\Program Files\QGIS 3.10\apps\qgis\python")

# append location of DLLs to current system PATH envrionment variable
os.environ['PATH'] += R";C:\Program Files\QGIS 3.10\apps\qgis\bin;"

# examine new PATH environment variable
print (os.environ['PATH'])


import qgis
import PyQt5.QtCore

app = qgis.QtCore.QCoreApplication([]) # is this 'QGIS app'?
import qgis.core  # raises an error: 'from qgis._core import *   ImportError: DLL load failed: The specified procedure could not be found.'

Answer 1

This snippet works for me in the OSGEO4W shell outside QGIS:

# coding=utf-8
import os, sys

sys.path.append(R"C:\OSGeo4W\apps\qgis\python")

os.environ['PATH'] += R";C:\OSGeo4W\apps\qgis\bin\;"

from qgis.core import *
from PyQt5.QtWidgets  import QApplication

app = QApplication([])
QgsApplication.setPrefixPath("C:\\OSGeo4W\\apps\\qgis\\", True) 
QgsApplication.initQgis()

layer = QgsVectorLayer("C:\\my_folder\\my_points.shp", "testlayer", "ogr")

if not layer.isValid():
  print ("Layer failed to load!")
else:
    for feat in layer.getFeatures():
        geom = feat.geometry()
        print(geom)

app.quit()