The common way is the format() function:

>>> s = "This is an {example} with {vars}".format(vars="variables", example="example")>>> s'This is an example with variables'

It works fine with a multi-line format string:

>>> s = '''\... This is a {length} example.... Here is a {ordinal} line.\... '''.format(length='multi-line', ordinal='second')>>> print(s)This is a multi-line example.Here is a second line.

You can also pass a dictionary with variables:

>>> d = { 'vars': "variables", 'example': "example" }>>> s = "This is an {example} with {vars}">>> s.format(**d)'This is an example with variables'

The closest thing to what you asked (in terms of syntax) are template strings. For example:

>>> from string import Template>>> t = Template("This is an $example with $vars")>>> t.substitute({ 'example': "example", 'vars': "variables"})'This is an example with variables'

I should add though that the format() function is more common because it's readily available and it does not require an import line.

NOTE: The recommended way to do string formatting in Python is to use format(), as outlined in the accepted answer. I'm preserving this answer as an example of the C-style syntax that's also supported.

# NOTE: format() is a better choice!string1 = "go"string2 = "now"string3 = "great"s = """I will %s thereI will go %s%s""" % (string1, string2, string3)print(s)

Some reading:

• String formatting
• PEP 3101 -- Advanced String Formatting

You can use Python 3.6's f-strings for variables inside multi-line or lengthy single-line strings. You can manually specify newline characters using \n.

Variables in a multi-line string

string1 = "go"string2 = "now"string3 = "great"multiline_string = (f"I will {string1} there\n"                    f"I will go {string2}.\n"                    f"{string3}.")print(multiline_string)

I will go there
I will go now
great

Variables in a lengthy single-line string

string1 = "go"string2 = "now"string3 = "great"singleline_string = (f"I will {string1} there. "                     f"I will go {string2}. "                     f"{string3}.")print(singleline_string)

I will go there. I will go now. great.

Alternatively, you can also create a multiline f-string with triple quotes.

multiline_string = f"""I will {string1} there.I will go {string2}.{string3}."""