python-docx about unusual operating

from docx import Document
document = Document
table = document.add_table(rows=2, cols=3)
# set the whole table in the center position
table.alignment = WD_TABLE_ALIGNMENT.CENTER

# set every single cell center 
 for row in table.rows:
                row.height = Inches(1)
                for cell in row.cells:
　　　　　　　　　　   # set colums  center
                    cell.vertical_alignment = WD_CELL_VERTICAL_ALIGNMENT.CENTER
                    paragraphs = cell.paragraphs
                    for paragraph in paragraphs:
　　　　　　　　　　　　　　 # set each cell center
                        paragraph.paragraph_format.alignment = WD_PARAGRAPH_ALIGNMENT.CENTER
                        for run in paragraph.runs:
                            font = run.font
                            font.size = Pt(22)

row_cell = table.add_row().cells
# choice one row
row_pic = row_cell[0]  
# clear blank area
row_pic._tc.clear_content()
# use paragraph function
pic_run = row_pic.add_paragraph().add_run()
# insert a picture path as a str into a cell from a table
pic_run.add_picture('./picture/{}'.format("picture_name.jpg"), width=Inches(5))

one way to change the font size from paragraph:

 p = document.add_paragraph()
 # there is not just set current paragraph font size ,also set the
 #  whole word enter blank,which means every enter as size as
 # there font size. if the other paragraph set font size as this
 # way, they will change together and you should care about that.
 p.style.font.size = Pt(22)

the other way :

  run = p.add_run(u'hello world')
  # there is another way set font size ,different from upton ,only
  # set current paragraph,the key is function ==>app_run() after it.
  run.font.size = Pt(22)