Python语言快速上手

1#coding:utf-8

  1varline = 2 ;
  2print(varline);
  3
  4#打印字符串
  5print("hello Python");
  6print("你好，Python");
  7
  8#整型和字符串的转化
  9num1 = 100 ;
 10num2 = "100";
 11num3 = num1 + int(num2);
 12print(num3);
 13
 14#字符串操作
 15str1 = "hello world" ;
 16str2 = str1 * 3 ;
 17string_count = len(str1);
 18print(string_count);
 19print(str2);
 20
 21#字符串索引等价
 22print(str1[0]); print(str1[-11])    #===>h
 23print(str1[1]); print(str1[-10])    #===>e
 24print(str1[2]); print(str1[-9])     #===>l
 25#可以将字符串进行分割
 26print(str1[0:5]);print(str1[6:11]); #===> hello      world
 27print(str1[-4:]);
 28#函数的定义和使用
 29def Print():
 30    print("hello world");
 31    return "sss" ;
 32
 33sss = Print();
 34print(sss);
 35
 36def add(arg1 , arg2):
 37    return arg1 + arg2 ;
 38print(add(1,2));
 39
 40def getTempatuare(temp):
 41    return temp *9/5 + 32 ;
 42print(str(getTempatuare(35)) + "'F");
 43
 44#克转千克算法
 45def print_kg(g):
 46    return float(g / 1000) ;
 47print(str(print_kg(1)) + "kg");
 48#求直角三角形斜边的长度
 49def Line_print(arg1,arg2):
 50    return ((arg1*arg1 + arg2 * arg2))**0.5
 51print("The right triangle third side's length is " + str(Line_print(3,4)));
 52
 53#str_rp = str1.replace(str1[:3],'*'*9);
 54#print(str_rp)
 55str11 = "{} a word she can get what she {} for."
 56str12 = "{preposition} a word she can get what she {verb} for"
 57str13 = "{0} a word she can get what she {1} for."
 58str111 = str11.format('With','came');
 59str121 = str12.format(preposition = 'With',verb = 'came')
 60str131 = str13.format('With','came')
 61print(str111)
 62print(str121)
 63print(str131)
 64
 65#单独创建
 66file1 = open('F:\\'+'hello.txt','w')
 67file1.write("Hello world");
 68file1.close()
 69
 70#使用函数创建
 71def text_create(name, msg):
 72    desktop_path = 'F:\\'
 73    full_path = desktop_path + name + '.txt'
 74    file = open(full_path,'w')
 75    file.write(msg)
 76    file.close()
 77    print('Done')
 78text_create('Yang','hello world') # ????
 79
 80#变量的比较
 81teststr1 = "Hello"
 82teststr2 = "World"
 83teststr3 = "Hello"
 84print(teststr1 in teststr2)
 85print(teststr1 is teststr3)
 86print(bool(teststr1))
 87print(bool(''))
 88print(not teststr1)
 89print(teststr1 < teststr3 and teststr2 > teststr1)
 90print(teststr1 > teststr2 or teststr3 < teststr1)
 91
 92#python逻辑判断学习
 93a = 1
 94b = 3
 95if a < b :
 96    a = 3
 97    b = 2
 98else:
 99    a = 2
100    b = 3
101print(a,b);
102
103if a < b:
104    a = 3
105    b = 2
106elif a > b:
107    a = 2
108    b = 3
109else:
110    a = 100
111    b = 200
112print(a,b)
113
114
115for i in 1,2,3,4,5,6:
116    print(i)
117for string_str in "hello","world","world":
118    print(string_str)
119for str1111 in "Hello":
120    print(str1111)

 1#python列表===>
 2#特点：可以装python的所有类型，包括元组，列表，字典等
 3city = ['广东','云南','广西','江西','HongKong','Shenzhen',123456]
 4for i in 0,1,2,3,4,5,6:
 5    print(city[i])
 6city.insert(1,'北京')  #列表的插入
 7for i in 0,1,2,3,4,5,6:
 8    print(city[i])
 9city.remove('HongKong') #列表的删除
10for i in 0,1,2,3,4,5,6:
11    print(city[i])
12del city[0]    #使用del方法删除列表中的元素
13for i in 0,1,2,3,4,5:
14    print(city[i])
15
16#python元组 ===>
17#特点：不可修改，可被查看以及索引
18num = ('1','2','3','4','5')
19for i in 0,1,2,3,4:
20    print(num[i])
21
22#python字典 ===>
23#特点：键值成对存在，键不可重复，值可重复，键不可改，值可以变，可以为任何对象
24Dog = {'name':'sundy','age':18}
25Dog.update({'tel':119}) #往字典中添加键值对
26print(Dog)
27del Dog['name']  #往字典中删除键值对
28print(Dog)
29
30#集合
31num_set = {1,2,3,4,1,5}
32num_set.add(6)  #往集合里添加元素
33print(num_set)
34num_set.discard(3) #从集合里删除元素
35print(num_set)

 1#coding:utf-8
 2#定义一个类
 3class Anmial:
 4    var = 100
 5    Dog = ['runing','eat','sleep']  #Dog是这个类的属性
 6    def function(self):     #类里的方法
 7        if  Anmial.var == 10:
 8            print(Anmial.var)
 9        else:
10            print(self+str(Anmial.Dog))
11        return Anmial.var
12
13#实例化类
14Dog1 = Anmial()
15print(Anmial.Dog)
16#遍历类中的成员
17for i in Anmial.Dog:
18    print(i)
19#创建实例属性===>类似创建一个与Dog一样的属性
20Anmial.log = '会飞','Hello','Monkey'
21print(Anmial.log)
22Anmial.function("属性:")
23
24class CocaCola():
25    formula = ['caffeine','suger','water','soda']
26    def __init__(self,local_name):  #===>self相当于可以用来访问类中的成员或者创建属性
27            self.logo_local = '橙汁'
28            if local_name == '可乐':
29                print(local_name)
30            elif local_name == '橙汁':
31                print(local_name)
32            else:
33                print('西瓜汁')
34    def drink(self): #===>调用该方法的时候等效于 coke = CocaCola.drink(coke)
35        print('Energy!')
36
37coke = CocaCola('可乐')
38coke1 = CocaCola('橙汁')
39coke2 = CocaCola('梨汁')
40
41#类的继承===>xuebi相当于CocaCoal的子类,CocaCoal相当于父类
42class xuebi(CocaCola):
43    formula = ['白色','黄色','绿色']
44
45xuebi = xuebi(CocaCola) #将CocaCola放在括号中，表面xuebi集成于CocalCola
46print(xuebi.formula)
47xuebi.drink()           #这样子类就可以调用父类的方法，继续延用了