title: text color in python-pptx module
body: <p>I would like to color a sentence, in different color - say, the first half in red and rest in blue.</p>
  
  <p>my code so far is like</p>
  
  <pre><code>from pptx import Presentation
  from pptx.util import Inches, Pt
  from pptx.dml.color import ColorFormat, RGBColor
  from pptx.enum.dml import MSO_COLOR_TYPE, MSO_THEME_COLOR
  import codecs
  
  
  prs = Presentation()
  title_slide_layout = prs.slide_layouts[0]
  slide = prs.slides.add_slide(title_slide_layout)
  
  
  text_file = open("content.txt", "r")
  # read the lyrics file
  lines = text_file.readlines()
  
  # page title
  title = slide.shapes.title
  
  # text frame in the page
  tf = title.textframe
  
  # paragrap in the text frame
  p = tf.add_paragraph()
  # write the first sentence 
  #p.text = unicode(lines[0], encoding='utf-8')
  p.text = "hello is red the rest is blue"
  p.font.bold = True
  p.font.color.rgb = RGBColor(255, 0, 0)
  
  prs.save('test.pptx')
  text_file.close()
  </code></pre>
  
  <p>in my code, the entire sentence is red; I would like to know how can I address different words to different color - again, say first half red the rest in blue.</p>