> str1 = '''Le vent se lève, il faut tenter de vivre. 
起风了，唯有努力生存。
（纵有疾风起，人生不言弃。）'''

> str1
'Le vent se lève, il faut tenter de vivre. \n起风了，唯有努力生存。\n（纵有疾风起，人生不言弃。）'

> print(str1)
Le vent se lève, il faut tenter de vivre. 
起风了，唯有努力生存。
（纵有疾风起，人生不言弃。）

> """
  <div class="AuthorInfo-content">
   <div class="AuthorInfo-head">
   <span class="UserLink AuthorInfo-name">
    <div class="Popover">
    <div id="Popover222-toggle" aria-haspopup="true" aria-expanded="false" aria-owns="Popover222-content">
     作者：<a class="UserLink-link" data-za-detail-view-element_name="User" target="_blank" href="{0}" rel="external nofollow" rel="external nofollow" >{1}</a>
    </div>
    </div>
   </span>
   </div>
   <div class="AuthorInfo-detail">
   <div class="AuthorInfo-badge">
    <div class="AuthorInfo-badgeText">
    签名：{2}
    </div>
   </div>
   </div>
  </div>
  <br/>
  """.format("https://stackoverflow.com/questions/45624449", "Using Python Variables in HTML in multiline Python string", "123")

> """
  <div class="AuthorInfo-content">
   <div class="AuthorInfo-head">
   <span class="UserLink AuthorInfo-name">
    <div class="Popover">
    <div id="Popover222-toggle" aria-haspopup="true" aria-expanded="false" aria-owns="Popover222-content">
     作者：<a class="UserLink-link" data-za-detail-view-element_name="User" target="_blank" href="{0}" rel="external nofollow" rel="external nofollow" >{1}</a>
    </div>
    </div>
   </span>
   </div>
   <div class="AuthorInfo-detail">
   <div class="AuthorInfo-badge">
    <div class="AuthorInfo-badgeText">
    签名：{2}
    </div>
   </div>
   </div>
  </div>
  <br/>
  """.format("https://stackoverflow.com/questions/45624449", "Using Python Variables in HTML in multiline Python string", "123")

> name = "Eric"
> profession = "comedian"
> affiliation = "Monty Python"
> message = f"""
...   Hi {name}. 
...   You are a {profession}. 
...   You were in {affiliation}.
... """
...
> message
'\n  Hi Eric.\n  You are a comedian.\n  You were in Monty Python.\n'

> str3 = ('Le vent se lève, il faut tenter de vivre.' 
'起风了，唯有努力生存。'
'（纵有疾风起，人生不言弃。）')

> str3
'Le vent se lève, il faut tenter de vivre.起风了，唯有努力生存。（纵有疾风起，人生不言弃。）'