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"A comma is used before and, or, or etc. in a list when its omission might either give rise to ambiguity or cause the last word or phrase to be construed with a preposition in the preceding phrase. … Generally, however, a comma is not used before and, or or etc. in a list."
The comma operator separates expressions (which have value) in a way analogous to how the semicolon terminates statements, and sequences of expressions are enclosed in parentheses analogously to how sequences of statements are enclosed in braces: [1] (a, b, c) is a sequence of expressions, separated by commas, which evaluates to the last expression c, while {a; b; c;} is a sequence of ...
A snippet of Python code with keywords highlighted in bold yellow font. The syntax of the Python programming language is the set of rules that defines how a Python program will be written and interpreted (by both the runtime system and by human readers). The Python language has many similarities to Perl, C, and Java. However, there are some ...
All about the Oxford comma, including when it may or may not be necessary.
The enclosed text becomes a string literal, which Python usually ignores (except when it is the first statement in the body of a module, class or function; see docstring). Elixir. The above trick used in Python also works in Elixir, but the compiler will throw a warning if it spots this.
This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters. For other languages and symbol sets (especially in mathematics and science), see below
For example, your card could read, “Merry Christmas! Love, Adam, Emily, Sarah, and Zach.” (Sometimes the comma before “and” is left out, and that is not technically incorrect, but you’ll ...
This sentence is a bit different; however, a comma is necessary as well. Using commas to offset certain adverbs is optional, including then, so, yet, instead, and too (meaning also). So, that's it for this rule. or; So that's it for this rule. A comma would be appropriate in this sentence, too. or; A comma would be appropriate in this sentence too.