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name: get_variable
returns: any
description: |
This function can be used to dynamically obtain a variable. `res =
get_variable(varname, fallback)` takes the value of `varname` (which
must be a string) and stores the variable of that name into `res`. If
the variable does not exist, the variable `fallback` is stored to
`res`instead. If a fallback is not specified, then attempting to read
a non-existing variable will cause a fatal error.
posargs:
variable_name:
type: str
description: Name of the variable to get
optargs:
default:
type: any
description: Fallback value to return when the variable does not exist
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