Definition, use, and parameter passing implementation code of the Python def function

In Python programming, for some programs that require repeated calls, you can use a function to define the basic form:

def function name (parameter 1, Parameter 2, ..., parameter n):

The EXECUTE statement function name is the name of the invocation, and the parameter is the passed-in parameter, which can be defined more or not.

# example 1: simple function using # coding=gb2312# definition function def hello ():  print ' Hello python! '  # Call Function    Hello ()  >>> Hello python!

Functions can have parameters and return values, parameters will be left-to-right matching, parameters can be set default values, when the function is not given the corresponding parameters, will be assigned by default values.

# example 2: Cumulative calculated value # coding=gb2312# definition function def myadd (a=1,b=100):  result = 0  i = a while  i <= B:  # default value is 1+2+3+......+100< C8/>result + = i      i + = 1  return result# print 1+2+......+10 print    myadd (1,10) print myadd ()    # Use default parameters 1,100print Myadd   # A assignment 50,b use default  >>> 55>>> 5050>>> 3825

When the parameters of a Python function are passed, it is worth noting that when a parameter is passed in, the variable is treated as a temporary assignment to the parameter variable, and if the object is referenced.

# example 3:# coding=gb2312def Testpara (P1,P2):  p1 = ten  p2.append (' hello ') L = []   # defines an array pair like a = $   # assigns a value to variable a testpar A (a,l) # variable A with Object array L passed in as parameter to   print a # After printing a run parameter for the value of V in L: # Print the members of an array object the    A variable is not re-evaluated after calling the function print v >>> >>> Hello  # While object L array adds member Hello

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