吴裕雄--天生自然python编程：实例(2)

list1 = [10, 20, 4, 45, 99]
list1.sort()
 
print("最小元素为:", *list1[:1])

 

 

list1 = [10, 20, 1, 45, 99]
 
print("最小元素为:", min(list1))

 

 

list1 = [10, 20, 4, 45, 99]
 
list1.sort()
 
print("最大元素为:", list1[-1])

 

 

list1 = [10, 20, 1, 45, 99]
 
print("最大元素为:", max(list1))

 

 

test_str = "Runoob"
 
# 输出原始字符串
print ("原始字符串为 : " + test_str)
 
# 移除第三个字符 n
new_str = ""
 
for i in range(0, len(test_str)):
    if i != 2:
        new_str = new_str + test_str[i]

print ("字符串移除后为 : " + new_str)

 

 

def check(string, sub_str): 
    if (string.find(sub_str) == -1): 
        print("不存在！") 
    else: 
        print("存在！") 
 
string = "www.runoob.com"
sub_str ="runoob"
check(string, sub_str)

 

 

str = "runoob"
print(len(str))

 

 

def findLen(str): 
    counter = 0
    while str[counter:]: 
        counter += 1
    return counter 
  
str = "runoob"
print(findLen(str))

 

 

import re 
  
def Find(string): 
    # findall() 查找匹配正则表达式的字符串
    url = re.findall('https?://(?:[-\w.]|(?:%[\da-fA-F]{2}))+', string)
    return url 
      
 
string = 'Runoob 的网页地址为：https://www.runoob.com，Google 的网页地址为：https://www.google.com'
print("Urls: ", Find(string))

 

 

def exec_code(): 
    LOC = """ 
def factorial(num): 
    fact=1 
    for i in range(1,num+1): 
        fact = fact*i 
    return fact 
print(factorial(5)) 
"""
    exec(LOC) 
 
exec_code()

 

 

str='Runoob'
print(str[::-1])

 

 

str='Runoob'
print(''.join(reversed(str)))

 

 

def rotate(input,d): 
    Lfirst = input[0 : d] 
    Lsecond = input[d :] 
    Rfirst = input[0 : len(input)-d] 
    Rsecond = input[len(input)-d : ] 
    print( "头部切片翻转 : ", (Lsecond + Lfirst) )
    print( "尾部切片翻转 : ", (Rsecond + Rfirst) )
 
if __name__ == "__main__": 
    input = 'Runoob'
    d=2  # 截取两个字符
    rotate(input,d)

 

 

def dictionairy():  
    # 声明字典
    key_value ={}     
 
    # 初始化
    key_value[2] = 56       
    key_value[1] = 2 
    key_value[5] = 12 
    key_value[4] = 24
    key_value[6] = 18      
    key_value[3] = 323 
    print ("按键(key)排序:")   
    # sorted(key_value) 返回一个迭代器
    # 字典按键排序
    for i in sorted (key_value) : 
        print ((i, key_value[i]), end =" ") 
  
def main(): 
    # 调用函数
    dictionairy()              
      
# 主函数
if __name__=="__main__":      
    main()

 

 

def dictionairy():  
    # 声明字典
    key_value ={}     
    # 初始化
    key_value[2] = 56       
    key_value[1] = 2 
    key_value[5] = 12 
    key_value[4] = 24
    key_value[6] = 18      
    key_value[3] = 323 
    print ("按值(value)排序:")   
    print(sorted(key_value.items(), key = lambda kv:(kv[1], kv[0])))     
   
def main(): 
    dictionairy()             
      
if __name__=="__main__":       
    main()

 

 

lis = [{ "name" : "Taobao", "age" : 100},  
{ "name" : "Runoob", "age" : 7 }, 
{ "name" : "Google", "age" : 100 }, 
{ "name" : "Wiki" , "age" : 200 }] 
  
# 通过 age 升序排序
print ("列表通过 age 升序排序: ")
print (sorted(lis, key = lambda i: i['age']) )
  
print ("\r") 
  
# 先按 age 排序，再按 name 排序
print ("列表通过 age 和 name 排序: ")
print (sorted(lis, key = lambda i: (i['age'], i['name'])) )
  
print ("\r") 
  
# 按 age 降序排序
print ("列表通过 age 降序排序: ")
print (sorted(lis, key = lambda i: i['age'],reverse=True) )

 

 

def returnSum(myDict): 
    sum = 0
    for i in myDict: 
        sum = sum + myDict[i] 
    return sum
  
dict = {'a': 100, 'b':200, 'c':300} 
print("Sum :", returnSum(dict))

 

 

test_dict = {"Runoob" : 1, "Google" : 2, "Taobao" : 3, "Zhihu" : 4} 
  
# 输出原始的字典
print ("字典移除前 : " + str(test_dict)) 
  
# 使用 del 移除 Zhihu
del test_dict['Zhihu'] 
  
# 输出移除后的字典
print ("字典移除后 : " + str(test_dict)) 
  
# 移除没有的 key 会报错
#del test_dict['Baidu']

test_dict = {"Runoob" : 1, "Google" : 2, "Taobao" : 3, "Zhihu" : 4} 
  
# 输出原始的字典
print ("字典移除前 : ") 
print(test_dict)
  
# 使用 del 移除 Zhihu
del test_dict['Zhihu'] 
  
# 移除没有的 key 会报错
#del test_dict['Baidu']

 

 

def Merge(dict1, dict2): 
    return(dict2.update(dict1)) 
      
# 两个字典
dict1 = {'a': 10, 'b': 8} 
dict2 = {'d': 6, 'c': 4} 
  
# 返回  None 
print(Merge(dict1, dict2)) 
  
# dict2 合并了 dict1
print(dict2)

 

 

def Merge(dict1, dict2): 
    res = {**dict1, **dict2} 
    return res 
      
# 两个字典
dict1 = {'a': 10, 'b': 8} 
dict2 = {'d': 6, 'c': 4} 
dict3 = Merge(dict1, dict2) 
print(dict3)

 

 

import time
 
a1 = "2019-5-10 23:40:00"
# 先转换为时间数组
timeArray = time.strptime(a1, "%Y-%m-%d %H:%M:%S")
 
# 转换为时间戳
timeStamp = int(time.mktime(timeArray))
print(timeStamp)

# 格式转换 - 转为 /
a2 = "2019/5/10 23:40:00"
# 先转换为时间数组,然后转换为其他格式
timeArray = time.strptime(a2, "%Y/%m/%d %H:%M:%S")
otherStyleTime = time.strftime("%Y/%m/%d %H:%M:%S", timeArray)
print(otherStyleTime)

 

 

import time
import datetime
 
# 先获得时间数组格式的日期
threeDayAgo = (datetime.datetime.now() - datetime.timedelta(days = 3))
# 转换为时间戳
timeStamp = int(time.mktime(threeDayAgo.timetuple()))
# 转换为其他字符串格式
otherStyleTime = threeDayAgo.strftime("%Y-%m-%d %H:%M:%S")
print(otherStyleTime)

 

 

import time
import datetime
 
#给定时间戳
timeStamp = 1557502800
dateArray = datetime.datetime.utcfromtimestamp(timeStamp)
threeDayAgo = dateArray - datetime.timedelta(days = 3)
print(threeDayAgo)

 

 

import time
 
# 获得当前时间时间戳
now = int(time.time())
#转换为其他日期格式,如:"%Y-%m-%d %H:%M:%S"
timeArray = time.localtime(now)
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)
print(otherStyleTime)

 

 

import datetime
 
# 获得当前时间
now = datetime.datetime.now()
# 转换为指定的格式
otherStyleTime = now.strftime("%Y-%m-%d %H:%M:%S")
print(otherStyleTime)

 

 

import time
 
timeStamp = 1557502800
timeArray = time.localtime(timeStamp)
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)
print(otherStyleTime)

 

 

import datetime
 
timeStamp = 1557502800
dateArray = datetime.datetime.utcfromtimestamp(timeStamp)
otherStyleTime = dateArray.strftime("%Y-%m-%d %H:%M:%S")
print(otherStyleTime)

 

 

name = "RUNOOB"
  
# 接收用户输入
# name = input("输入你的名字: \n\n") 
  
lngth = len(name) 
l = "" 
  
for x in range(0, lngth): 
    c = name[x] 
    c = c.upper() 
      
    if (c == "A"): 
        print("..######..\n..#....#..\n..######..", end = " ") 
        print("\n..#....#..\n..#....#..\n\n") 
          
    elif (c == "B"): 
        print("..######..\n..#....#..\n..#####...", end = " ") 
        print("\n..#....#..\n..######..\n\n") 
          
    elif (c == "C"): 
        print("..######..\n..#.......\n..#.......", end = " ") 
        print("\n..#.......\n..######..\n\n") 
          
    elif (c == "D"): 
        print("..#####...\n..#....#..\n..#....#..", end = " ") 
        print("\n..#....#..\n..#####...\n\n") 
          
    elif (c == "E"): 
        print("..######..\n..#.......\n..#####...", end = " ") 
        print("\n..#.......\n..######..\n\n") 
          
    elif (c == "F"): 
        print("..######..\n..#.......\n..#####...", end = " ") 
        print("\n..#.......\n..#.......\n\n") 
          
    elif (c == "G"): 
        print("..######..\n..#.......\n..#.####..", end = " ") 
        print("\n..#....#..\n..#####...\n\n") 
          
    elif (c == "H"): 
        print("..#....#..\n..#....#..\n..######..", end = " ") 
        print("\n..#....#..\n..#....#..\n\n") 
          
    elif (c == "I"): 
        print("..######..\n....##....\n....##....", end = " ") 
        print("\n....##....\n..######..\n\n") 
          
    elif (c == "J"): 
        print("..######..\n....##....\n....##....", end = " ") 
        print("\n..#.##....\n..####....\n\n") 
          
    elif (c == "K"): 
        print("..#...#...\n..#..#....\n..##......", end = " ") 
        print("\n..#..#....\n..#...#...\n\n") 
          
    elif (c == "L"): 
        print("..#.......\n..#.......\n..#.......", end = " ") 
        print("\n..#.......\n..######..\n\n") 
          
    elif (c == "M"): 
        print("..#....#..\n..##..##..\n..#.##.#..", end = " ") 
        print("\n..#....#..\n..#....#..\n\n") 
          
    elif (c == "N"): 
        print("..#....#..\n..##...#..\n..#.#..#..", end = " ") 
        print("\n..#..#.#..\n..#...##..\n\n") 
          
    elif (c == "O"): 
        print("..######..\n..#....#..\n..#....#..", end = " ") 
        print("\n..#....#..\n..######..\n\n") 
          
    elif (c == "P"): 
        print("..######..\n..#....#..\n..######..", end = " ") 
        print("\n..#.......\n..#.......\n\n") 
          
    elif (c == "Q"): 
        print("..######..\n..#....#..\n..#.#..#..", end = " ") 
        print("\n..#..#.#..\n..######..\n\n") 
          
    elif (c == "R"): 
        print("..######..\n..#....#..\n..#.##...", end = " ") 
        print("\n..#...#...\n..#....#..\n\n") 
          
    elif (c == "S"): 
        print("..######..\n..#.......\n..######..", end = " ") 
        print("\n.......#..\n..######..\n\n") 
          
    elif (c == "T"): 
        print("..######..\n....##....\n....##....", end = " ") 
        print("\n....##....\n....##....\n\n") 
          
    elif (c == "U"): 
        print("..#....#..\n..#....#..\n..#....#..", end = " ") 
        print("\n..#....#..\n..######..\n\n") 
          
    elif (c == "V"): 
        print("..#....#..\n..#....#..\n..#....#..", end = " ") 
        print("\n...#..#...\n....##....\n\n") 
          
    elif (c == "W"): 
        print("..#....#..\n..#....#..\n..#.##.#..", end = " ") 
        print("\n..##..##..\n..#....#..\n\n") 
          
    elif (c == "X"): 
        print("..#....#..\n...#..#...\n....##....", end = " ") 
        print("\n...#..#...\n..#....#..\n\n") 
          
    elif (c == "Y"): 
        print("..#....#..\n...#..#...\n....##....", end = " ") 
        print("\n....##....\n....##....\n\n") 
          
    elif (c == "Z"): 
        print("..######..\n......#...\n.....#....", end = " ") 
        print("\n....#.....\n..######..\n\n") 
          
    elif (c == " "): 
        print("..........\n..........\n..........", end = " ") 
        print("\n..........\n\n") 
          
    elif (c == "."): 
        print("----..----\n\n")