python中函数的几个小知识点

'''
Created on 2011-9-29

@author: xgzhao
'''

# variant parameters in function definition
def fun(name, age=12, *rest):
print name, age
print [i for i in rest]

# use dictionary as key parameters
def function(name, age=13, *rest, **dictionary):
for d in dictionary.keys():
print d

#anonymity function: lambda
true = lambda : True
print true()

#provide the same function
def add(x, y): return x+y
lambda x, y : x+y

print map((lambda x:x+2), [0, 1, 2, 3, 4, 5, 6])