Metasyntactic Variables (aka Plahceholder Names)

From Wikipedia

The word foo occurs in over 330 RFCs. bar occurs in over 290.

In computer science, programmers use metasyntactic variables to describe a placeholder name or an alias term commonly used to denote the subject matter under discussion or an arbitrary member of a class of things under discussion. The use of a metasyntactic variable is helpful in freeing a programmer from creating a logically named variable, which is often useful when creating or teaching examples of an algorithm. The word "foo" is the principal example.

words = ["foo", "bar", "baz", "qux",
"quux", "corge", "grault", "garply", "waldo", "fred",
"plugh", "xyzzy", "thud", "wibble", "wobble",
"wabble", "webble", "wubble"]

print("Space Separated String")
print(f'"{" ".join(words)}"')

print("Comma Separated String")
print(f'"{", ".join(words)}"')

print("Single Quoted List/Array")
print("['", end='')
print("', '".join(words), end='')
Space Separated String
"foo bar baz qux quux corge grault garply waldo fred plugh xyzzy thud wibble wobble wabble webble wubble"

Comma Separated String
"foo, bar, baz, qux, quux, corge, grault, garply, waldo, fred, plugh, xyzzy, thud, wibble, wobble, wabble, webble, wubble"

Single Quoted List/Array
['foo', 'bar', 'baz', 'qux', 'quux', 'corge', 'grault', 'garply', 'waldo', 'fred', 'plugh', 'xyzzy', 'thud', 'wibble', 'wobble', 'wabble', 'webble', 'wubble']