String formatting

By convention, all strings should be in double quotes "" (single quotes will be blackened either way). If dynamic content is needed in a string, it should be formatted using f-strings like so:

foo = "bar"
baz = 5

print(f"The value of foo is {foo}, and baz is {baz}")

About any operation can go in the brackets, however you will need to use single quotes if you need a string there.

foo = ["bar","baz"]

print(f"The elements in foo are {','.join(foo)}.")