cs.env 20190103

Some environment related functions.

Some environment related functions.

• LOGDIR, VARRUN, FLAGDIR: lambdas defining standard places used in other modules

• envsub: replace substrings of the form '$var' with the value of 'var' from environ.

• getenv: fetch environment value, optionally performing substitution

Function envsub(s, environ=None, default=None)

Replace substrings of the form '$var' with the value of 'var' from environ.

Parameters:

• environ: environment mapping, default os.environ.
• default: value to substitute for unknown vars; if default is None a ValueError is raised.

Function getenv(var, default=None, environ=None, dosub=False)

Fetch environment value.

Parameters:

• var: name of variable to fetch.
• default: default value if not present. If not specified or None, raise KeyError.
• environ: environment mapping, default os.environ.
• dosub: if true, use envsub() to perform environment variable substitution on default if it used. Default value is False.