1编写第一个程序（python 3）

print('hello world!')

2.查看python 版本号

python -v

3.使用变量

message = 'hello world!' print(message)

4.字符串

name = 'jetty'print(name.title()) #Jetty 首字母大写print(name)  jettyname.upper() #JEETY 转大写name.lower() #jetty 转小写

5.合并拼接字符串

first_name = 'hongzhu'last_name = 'zhan'full_name = last_name +" "+ first_nameprint(full_name)  zhan hongzhu

6.使用制表来添加空白

language = 'python\nJavascript\nC\nRust'print(language) 打印pythonJavascriptCRust

7.删除空白

_blank = ' python 'print(_blank.rstrip()) #去除右侧空白print(_blank.strip()) #去除两侧空白print(_blank.lstrip()) #去除左侧空白

8.变量类型

num = 2.340print(int(num))  #整型 2print(float(num))  #浮点型 2.34

9.列表

color = ['red','green','yellow','pink']#访问元素print(color[0]) ##red#修改color[0] = 'black'#添加元素color.append('orange')#插入元素color.insert(0,'blue') #插到第一位print(color)#删除元素del color[0] #删除当前元素color.pop()  #删除数组最后一个元素color.remove('red')  #删除红色

10 组织列表

10.1排序列表

num_list = [1,2,3,4,2,1,3,1,2]num_list.sort()print(num_list) [1, 1, 1, 2, 2, 2, 3, 3, 4]

10.2临时排序

num_list = [1,2,3,4,2,1,3,1,2]print(sorted(num_list)) [1, 1, 1, 2, 2, 2, 3, 3, 4]

10.3reverse 反序

num_list = [1,2,3,4,2,1,3,1,2]num_list.reverse()print(num_list) [2, 1, 3, 1, 2, 4, 3, 2, 1]

10.4列表的长度

num_list = [1,2,3,4,2,1,3,1,2]print(len(num_list))  9

11 遍历列表

num_list = [1,2,3,4,2,1,3,1,2]for i in num_list:    print(i,end=" ")  #一行显示

12.使用函数遍历

num_list = [1,2,3,4,2,1,3,1,2]for i in range(len(num_list)):    print(num_list[i],end=" ")

13.乘方运算

squares = []for i in range(1,6):    squares.append(i**2)print(squares) [1, 4, 9, 16, 25]

14.内置函数

num_list = [1,2,3,4,2,1,3,1,2]print(max(num_list)) 4print(min(num_list)) 1print(sum(num_list)) 19

15.列表解析

squeres = [value**2 for value in range(1,11)]print(squeres) [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

16.练习示例

16.1 1-50奇数的和

odd_number =[]for i in range(1,11,2):    odd_number.append(i)print(sum(odd_number))

16.2 3-90 3的倍数

three_nmu = []for i in range(3, 91):    if (i % 3==0):        three_nmu.append(i)print(three_nmu)

16.3 1-10 的立方

squares = []for i in range(3,11):    squares.append(i**3)print(squares)

16.4 1-10 的立方列表解析

squares = [i**3 for i in range(3,11)]print(squares)

17 列表切片

num_list = [1,2,3,4,2,1,3,1,2]print(num_list[0:5]) [1, 2, 3, 4, 2] #从第一个开始取值到第五位print(num_list[:5]) [1, 2, 3, 4, 2] #默认会从第一个开始取值print(num_list[5:]) [1, 3, 1, 2] #取后面的4位

18 元组

dimensions = (100,300)print(dimensions[0]) 100for i in dimensions:    print(i) 100 300

19 if 语句

num_list = [1, 2, 3, 4, 2, 1, 3, 1, 2]for i in num_list:    if i == 2:        print(i)

20 !=

num_list = [1, 2, 3, 4, 2, 1, 3, 1, 2]for i in num_list:    if i != 2:        print(i)

21 and

num_list = [1, 2, 3, 4, 2, 1, 3, 1, 2]for i in num_list:    if i >=1 and i <=2:        print(i)

22 字典

alien  = {'color':0,'points':1}print(alien['color']) ##color

23 修改字典

alien  = {'color':0,'points':1}alien['color'] = 'red'print(alien) {'color': 'red', 'points': 1}

24 删除字典

alien  = {'color':0,'points':1}del alien['color']print(alien)

25 案例练习

25.1创建两个人的字典，存储在列表，遍历列表，输出列表

people_nums1 = {'name':'jetty','name1':'jack'}people_nums2 ={'name':'kitty','name1':'james'}peoples = [people_nums1,people_nums2]for i in peoples:    print(i)

26.用户输入和while循环

ipt = input('你是小黄么？1(true) or 2(false)?')if ipt =='1':    print('是本人')else:    print('不是本人')

27 % //运算符

print(4 % 2)   0print(4 // 2)   2

28 while运算符

count = 0arr = []while count < 20:    for j in range(1, 100):        if j % 11 == 0:            count = count+1            arr.append(j)print(arr)

29 函数

#简单求和def num_sum(arr):    result =0    for i in arr:        result =result+i    return resultprint(num_sum([1,2,3,4])) 10

30 函数默认值

def num_sum(arr=[1,2,3]):    result =0    for i in arr:        result =result+i    return resultprint(num_sum()) 6

31 传递任意数量的实参

def make_prize(*top):    return topprint(make_prize(1))print(make_prize(1,2,3))print(make_prize(1,3,4,5))print(make_prize(1,1,1,1,1))#返回(1,)(1, 2, 3)(1, 3, 4, 5)(1, 1, 1, 1, 1)

32 导入函数

# 随机数import randomprint(random.randint(1,19))

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