2011年8月1日 · Separating words: some_variable; Private variables start with underscores: _private; Adding at the end to distinguish from a built-in name: filter_ (since filter is a built-in function) By itself as an unused variable during looping: [0 for _ in range(n)] Note that some people really don't like that last use case.

In DSLs and other fluent interfaces often variable- and method-name taken together form a lexical entity. For example, I personally like the (admittedly heretic) naming pattern where the verb is put into the variable name rather than the method name. @see 6th Rule of Variable Naming

Variable names are case-sensitive. A variable's name can be any legal identifier — an unlimited-length sequence of Unicode letters and digits, beginning with a letter, the dollar sign "$", or the underscore character "_". The convention, however, is to always begin your variable names with a letter, not "$" or "_".

2010年2月13日 · Having variable names that change depending on the value of a variable leads to unnecessary complications. A cleaner way is to use a dictionary: vr={} for n in alist: vr[n]=some_calculation()

The $ in the variable name is only part of the name, but the convention is to use it to start variable names when the variable represents a jQuery object.

It's simply pointless to create variable variable names. Why? They are unnecessary: You can store everything in lists, dictionarys and so on; They are hard to create: You have to use exec or globals() You can't use them: How do you write code that uses these variables? You have to use exec/globals() again; Using a list is much easier:

2012年7月19日 · I have a variable with a string assigned to it and I want to define a new variable based on that string. foo = "bar" foo = "something else" # What I actually want is: bar...

Instead of converting the variable name into a string, I convert a string into a variable. This only works if the variable name is known of course. Take this: var height = 120; testAlert(height); This should display: height: 120 This can be done like this:

2010年10月19日 · Or if you did items=locals(); b = 3 ; items['b'] it will find the new variable b, since it didn't actually copy the locals dict to items (which would be slower). If you had done items=locals().copy() there may have been a minor difference; but then again the copying step is probably slower than accessing the small number of items from the ...

Since Bash 4.3 (released 2014), the declare builtin has an option -n for creating a variable which is a “name reference” to another variable, much like C++ references. Just as in Method 1, the reference stores the name of the aliased variable, but each time the reference is accessed (either for reading or assigning), Bash automatically ...