29, python based learning - Advanced Functions

! # / usr / bin / env Python 
#__author: HLC 
#date: 2019/6/2 

# higher order function 
"" " 
1, function names can be assigned 
2, function name can be used as function parameters, but also as a function of return value 
"" " 
# DEF F (n-): 
# * n-n-return 
# DEF foo (A, B, foo): 
# return foo (A) + foo (B) # 13 is 
# Print (foo (2,3, f))