def float_env(var_name, default=0.0):
    return float(getenv(var_name, default))
Lexically analyze `text`.
dataset/ETHPy150Open lyft/confidant/confidant/settings.py/float_env--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/utils/jslex.py/Lexer.lex