def EnsureDefinition(name, definition, target=__builtins__.__dict__):
"""
EnsureDefinition(name, definition, target)
Ensure that a name exists in the given target namespace (a dictionary). If
it does exist, do nothing. If it doesn't, execute the definition in the
target.
"""
print 'Checking for %s in target...' % name,
if target.has_key(name):
print 'found.'
else:
print 'not found! Defining with %s' % definition
exec definition in target
EnsureDefinition('False','False = 0')
EnsureDefinition('True','True = not False')
EnsureDefinition('bool','''
def bool(x):
if x:
return True
else:
return False
'''
# Output for Python version < 2.2.1:
#
# Checking for False in target... not found! Defining with False = 0
# Checking for True in target... not found! Defining with True = not False
# Checking for bool in target... not found! Defining with def bool(x):
# if x:
# return True
# else:
# return False
