def function name (function parameters):
function body
, for example:
def FUNC (A): # A is a parameter
Print (A)
FUNC ( 123) # 123 is the argument
parameter is divided into: a keyword parameter, a position parameter, mixed parameter
keyword parameter
DEF FUNC (X, Y, Z = " default parameters " ):
Print (X, Y, Z)
FUNC ( 1, Y = " xumou " ) # 1 xumou default parameters
' ''
represents a position parameter,
y represents the keyword parameter
z represents the default parameters of
the relationship between them: keyword parameter must be behind the position parameter,
a position parameter> keyword parameters, the default value of the parameter
'' '
# when the received dynamic parameters, the dynamic parameters have to be in the rear position parameter
deffunc01 (A, B, * GG):
Print (GG, A, B)
func01 ( 1,2, " 34 is " )
# position parameter and default values of the parameters: position parameter must be declared, then declare a default value of the parameter
DEF func03 ( a, C = 12 is ):
Print (a, C)
func03 ( " AA " ) # AA 12 is
# * PP * in receiving any of the dynamic parameters:
DEF func03 (* PP):
Print (PP)
func03 ( " Q " , " W " , " E " , 22,33) # ( 'Q', 'W', 'E', 22 is, 33 is)
#Accept dynamic parameters: positional parameters must be in the dynamic parameter
DEF func04 (A, b, * args):
Print ( " func04 >> " , A, b, args)
func04 ( 1,2,5,7) # func04 >> 12 (5, 7)
# ---------- error model: ----------
DEF func04 (* args, A, B):
Print ( " func04 >> " , A, B, args)
func04 ( 1,2,5,7) # error
# -------
# error: because of the changed:
DEF func04 ( * args, A, b):
Print ( " func04 >> " , A, b, args)
func04 ( 1,2,. 5 A =, B =. 7) # func04 >>. 5. 7 (. 1, 2)
# ** kwargs for receiving dynamic parameters keyword
DEF func02 (** kwargs):
Print (kwargs) # { 'a': 12, 'b ': 23} the result is a dict
func02 (a = 12 is, B = 23 is )
# final order is:
# position parameter> * args> default parameters> ** kwargs