for python 字典和函数def

关于python中的函数的def

def 的定义参数：形参和实际参数

例如下面中的songer和songname为形参而“alan warker，play crime,tobu为实际参数”

关于参数顺序如果没有特殊说明则按照顺序来

def love_song_message(songer,songname):
    "定义喜欢歌手的姓名和曲目"
    print("\ni love called ".title() + songer.title() + "!")
    print(songer.title() + " song have called " + songname.title())
love_song_message("alan warker","play")
love_song_message("tobu","crime")」‘‘‘

#这俩个代码表示相同def love_song_message(songer,songname):
    "定义喜欢歌手的姓名和曲目"
    print("\ni love called ".title() + songer.title() + "!")
    print(songer.title() + " song have called " + songname.title())
love_song_message(songer="alan warker",songname="play")
love_song_message(songname="crime",songer="tobu")#如果没有特别说明则系统默认顺序为一一对应。否则按照实际参数与形式参数对应

当然如果这里含默认值则如下

#要注意位置。要表示相同
def love_song_message(songname,songer="alan worker"):
    """定义喜欢歌手的姓名和曲目"""
    print("\ni love called ".title() + songer.title() + "!")
    print(songer.title() + " song have called " + songname.title())
love_song_message(songname="play")
love_song_message(songname="torb")

运行：

I Love Called Alan Worker!

Alan Worker song have called Play

I Love Called Tobu!

Tobu song have called Cirme

def love_song_message(songname,songer="alan worker"):
    """定义喜欢歌手的姓名和曲目"""
    print("\ni love called ".title() + songer.title() + "!")
    print(songer.title() + " song have called " + songname.title())
love_song_message("play")#love_song_message(songname = "play")这是等同的一个利用位置关系，另一个使用参数调用实际参数赋值给形式参数
love_song_message(songname="cirme",songer= "tobu")#love_song_message(songer="tobu",songname="crime")这两个等同

运行：

I Love Called Alan Worker!

Alan Worker song have called Play

I Love Called Tobu!

Tobu song have called Cirme

这两个运行值相同，可以更改默认值。关于这个有很多

下面这是关于字典

alien_0 = {"color":"green","points":"5"}
print(alien_0["color"])
print()#为了空行
print(alien_0["points"])
new_points = alien_0["points"]
print ("\n you".title() + " " + ‘just earned ‘ + new_points +" "+ "points !")

alien_0 = {"x_position": 5, "y_position": 50 ,"speed": "fast" }
print("\noriginal ".title() +" "+ "x_position:" + str(alien_0["x_position"]))

#定义开始的外星人的位置和速度
#打印开始的方位
if alien_0["speed"] == "slow":
    x_increment = 1
elif alien_0["speed"] == "medium":
    x_increment = 2
else :
    x_increment = 3
alien_0["x_position"] = alien_0["x_position"] + x_increment
print("\nnew".title()+" "+ "x_position:"+str(alien_0["x_position"]))

字典无非将列表中的元素表示出来这里我要说的字典使用用{} 而将列表使用[]

skill = [‘program‘, ‘ cook‘, ‘know very knowledge‘]
len(skill)#规定元素个数
print("\n\t I skill")
print(skill)

programe_languages = [‘python‘,‘c++‘,‘java‘,‘javascipt‘,‘ago‘,‘php‘,‘ruby‘]
print("\t\n I learn programe language:" )
for programe_language in programe_languages:#for中program_language是遍例program_languages中的元素

print(programe_language.title())

我们约定一般表示元素的为复数

大概如此

原文地址：https://www.cnblogs.com/luzhi0324/p/11623063.html