Can dashes be used in variable names?

4 Answers. Hyphens are used as subtraction and negation operators, so they cannot be used in variable names.

Can you have dashes in Python variable names?

Because in python hyphen is used as a substraction operator and the Variable names can only consist of characters as you know names are also string because of combination of characters so it’s not allow the usage of hypens for function and variables names as well.

What are the syntactic rules for naming variables?

Rules for naming variables:

• All variable names must begin with a letter of the alphabet or an. underscore( _ ).
• After the first initial letter, variable names can also contain letters and numbers.
• Uppercase characters are distinct from lowercase characters.
• You cannot use a C++ keyword (reserved word) as a variable name.

What are the two rules for naming a variable?

Rules for naming a variable A variable name can only have letters (both uppercase and lowercase letters), digits and underscore. The first letter of a variable should be either a letter or an underscore. There is no rule on how long a variable name (identifier) can be.

Can bash variables have dash?

# As of version 3 of Bash, periods are not allowed within variable names. Using a hyphen or other reserved characters in a variable name (or function name).

Can bash variables have hyphens?

1 Answer. The “why” is almost irrelevant: The POSIX standard makes it very clear that export is only required to support arguments which are valid names, and anything with a dash is not a valid name.

Can Python modules have dashes?

Python packages and modules can not use hyphens, only underscores. This section of PEP-8 gives us guidance: Package and Module Names: Modules should have short, all-lowercase names. Underscores can be used in the module name if it improves readability.

What does hyphen mean in Python?

It means “dash.” They probably expect some negative numbers (i.e. -0.5). The () means that it is capturing the matches.

How are keywords different from variable names?

keywords are special reserve words which carry a special meaning to the system compiler. Variable are named memory locations which contains a value.

Which of the following is correct about variable naming rules?

A – Variable names must begin with a letter or underscore character. B – A variable name can consist of numbers, letters, underscores. C – you cannot use characters like + , – , \% , ( , ) .

Can a Bash variable start with an underscore?

Starting variables with an underscore is o.k. # However . . . using just the underscore will not work. _=25 echo $_ # $_ is a special variable set to last arg of last command. Using a hyphen or other reserved characters in a variable name (or function name).

What is the difference between underscore and dash in a URL?

Dashes are recommended by Google over underscores ( source ). Dashes are more familiar to the end user. Dashes are easier to write on a standard keyboard (no need to Shift). Dashes don’t hide behind underlines. Dashes feel more native in the context of URLs as they are allowed in domain names.

What is the difference between underscoredashes and dashdashes?

Dashes are recommended by Google over underscores ( source ). Dashes are more familiar to the end user. Dashes are easier to write on a standard keyboard (no need to Shift). Dashes don’t hide behind underlines. Dashes feel more native in the context of URLs as they are allowed in domain names. It’s not just dash vs. underscore:

Is the Dash a word break character or underscore?

By my reading, this interpretation (dash as a word break character but not underscore) is continued in the Unicode world. It defines the rules for word boundaries here: (Just for reference, in unicode terminology, the underscore is called a “LOW LINE”, and the dash is called a hyphen.

Should a text box treat underscores and dashes as punctuation?

I expect a text box to treat underscores and dashes like my IDEs treat them: an underscore as a letter, and a dash as “punctuation”. In programming of course, this makes sense.