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import picobox
def spam():
return eggs()
def eggs():
return rice()
@picobox.pass_("secret")
def rice(secret):
print(secret)
with picobox.push(picobox.Box()) as box:
box.put("secret", 42)
# We don't need to propagate a secret down to rice which is good because
# we kept interface clear (i.e. no changes in spam and eggs signatures).
spam()
# The other good thing is despite injection rice can explicitly receive
# a secret which means its signature wasn't changed either.
rice(13)
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