Read variables in bash script by sourcing the file and echoing the variable.

get_bash_var.py

def get_var(srcfile, *variables):
    """Get variables' values from bash shell source file.

    Return a dictionary that maps from variable name to its value.

    """
    cmd = ". " + srcfile + ";"
    for var in variables:
        cmd += "echo ${" + var + "};"
    proc = subprocess.Popen([cmd], stdout=subprocess.PIPE, shell=True)
    output = proc.communicate()[0]
    proc.stdout.close()
    if output is None:
        return {}
    else:
        values = output.split("\n")
        return dict(zip(variables, values))