D02——C语言基础学PYTHON

#关于字符串的一些操作
‘‘‘
name = "zhang\tkanghui"

print(name.capitalize())                       #capitalize首字母大写
print(name.count("a"))                        #count计数
print(name.center(50,"-"))                    #center（50，“-”）表示总共50个字符，输出占中间位置
print(name.encode())
print(name.endswith("ui"))                    #判断是不是以ui结尾
print(name.expandtabs(tabsize=30))            #将tab在输出时转成相应数量的空格
print(name.find("kang"))                     #找到字符开头的索引
‘‘‘

name ="my name is {name} and i am {year} old"
print(name.format(name=‘zhangkanghui‘,year=23))                     #格式化输出
print(name.format_map(  {‘name‘:‘zhangkagnhui‘,‘year‘:23}  ))     #以字典形式格式化输出
print(name.isdigit())                                               #判断是否为数字
print(name.isalnum())                                               #判段是否为阿拉伯
print(‘abc12/‘.isalnum())
print(name.isalpha())                                               #判断是否为纯英语字母
print(‘Aa‘.isalpha())
print(name.isdecimal())                                             #判断是否为十进制
print(name.isidentifier())                                          #判断是否为合法标识符
print(‘ ab‘.isidentifier())
print(name.islower())
print(name.isnumeric())
print(‘1.2‘.isnumeric())                                            #判断是否为纯数字，小数点也不行
print(name.isspace())                                               #判断是否为空格
print(name.istitle())                                               #判断是否为标题，即每个都是首字母大写开头
print(name.isprintable())                                           #判断是否可打印，tty file，drive file
print(name.isupper())                                               #判断是否全部为大写
print(‘+‘.join([‘1‘,‘2‘,‘3‘]))
print(name.ljust(50,‘*‘))                                           #总长为50，左侧开始
print(name.rjust(50,‘-‘))                                           #总长为50，右侧开始
print(name.lower())                                                 #把大写变成小写
print(name.upper())                                                 #把小写变成大写
print(name.lstrip())
print(name.strip())                                                 #去掉两头的空格和回车
print(name.rstrip())
p =str.maketrans(‘abc‘,‘123‘)
print("alex li".translate(p))
print("alex li".replace(‘l‘,‘L‘,1))
print("alex li".rfind(‘l‘))                                         #查找右侧的
print("alex li".split())                                            #把字符串以空格分离，以列表输出
print("alex li".split(‘l‘))                                         #把字符串以l分
print("1+\n2+3".splitlines())                                       #去除换行符
print("alex Li".swapcase())                                         #小写换大写，大写换小写
print("alex li".title())                                            #变成标题，即每个首字母大写
print(name.zfill(50))                        

list_1 = [1,2,4,5,6,2,1,]
list_1 =set(list_1)
print(list_1,type(list_1))          #集合无序、不重复

list_2 =set([0,66,222,4,6])
print(list_1,list_2)
#交集intersection
print(list_1.intersection(list_2))
#并集union
print(list_1.union(list_2))
#差集differeence    in list_1 but not in list_2
print(list_1.difference(list_2))
print(list_2.difference(list_1))
#子集issubset
print(list_1.issubset(list_2))
#父集isupperset
print(list_1.issubset(list_2))
#对称差集
print(list_1.symmetric_difference(list_2))

list_3 =set([1,2,3])
list_4 =set([4,5,6])
print(list_3.isdisjoint(list_4))    #没有交集返回True

#基本操作
list_3.add(999)
print(list_3)
list_3.update([777,888,999])
print(list_3)
print(list_3.pop())
print(list_3.pop())
print(list_3.pop())
print(list_3.pop())

 1 我不去想是否能够成功
 2 既然选择了远方
 3 便只顾风雨兼程
 4 我不去想能否赢得爱情 既然钟情于玫瑰
 5 就勇敢地吐露真诚
 6 我不去想身后会不会袭来寒风冷雨
 7 既然目标是地平线
 8 留给世界的只能是背影
 9 我不去想未来是平坦还是泥泞
10 只要热爱生命 一切，都在意料之中

 1 ‘‘‘
 2 data =open("yesterday",encoding="utf-8").read()
 3 #1encoding：windows默认GBK
 4 #2‘r‘只能读；‘w‘只能写，且是创建一个新的文件，如果文件名已存在，则会覆盖；‘a‘只能写，append追加补充不会覆盖源文件
 5 print(data)
 6 ‘‘‘
 7 #f =open("yesterday",‘r‘,encoding="utf-8")
 8 #f =open("yesterday",‘w‘,encoding="utf-8")
 9 #f =open("yesterday",‘a‘,encoding="utf-8")
10 ‘‘‘
11 f =open("yesterday",encoding="utf-8")  #赋给f一个内存对象，又叫文件件句柄
12 data =f.read()
13 print(data)
14 ‘‘‘

 1 #读写‘r+‘读和追加，能读能写，但是写只能在尾部追加无论读取光标的位置在哪
 2 f =open("yesterday2",‘r+‘,encoding="utf-8")
 3 print(f.readline())
 4 print(f.readline())
 5 print(f.readline())
 6 print(f.tell())
 7 f.write("-------NB--------")
 8 
 9 #写读‘w+‘能写能读，创建新文件写，读仍然是在为不追加，无论读取光标位置
10 f =open("yesterday2",‘w+‘,encoding="utf-8")
11 f.write("-------NB--------\n")
12 f.write("-------NB--------\n")
13 f.write("-------NB--------\n")
14 print(f.tell())
15 f.seek(10)
16 print(f.readline())
17 f.write("should be at the begining of the second line")
18 f.close()
19 ‘‘‘
20 #追加读写‘a+‘

1 #Author：ZhangKanghui
2 
3 ‘‘‘
4 #‘rb‘二进制。视频以二进制读取。
5 f =open("yesterday2",‘rb‘)
6 print(f.readline())
7 ‘‘‘
8 f =open("yesterday2",‘wb‘)
9 f.write("Hello world\n".encode())     #二进制便把文件str转换成byte用encode（）

 1 #读取前五行
 2 ‘‘‘
 3 f =open("yesterday",encoding="utf-8")
 4 
 5 for i in range(5):
 6     print(f.readline())
 7     
 8 print(f.readline())
 9 print(f.readline())
10 print(f.readline())
11 print(f.readline())
12 print(f.readline())

 1 #不读取第十行
 2 #f =open("yesterday",encoding="utf-8")
 3 #low bige loop
 4 ‘‘‘
 5 #print(f.readlines())                       #把文件读取成一个列表，但这种方法只适合小文件读取
 6 #for line in f.readlines():
 7 for index,line in enumerate(f.readlines()):
 8     if index == 9:
 9         print("-----我是分割线-----")
10         continue
11     print(line.strip())                             #若不换行，    .strip去除换行符
12 ‘‘‘
13 #high bige loop
14 ‘‘‘
15 count = 0
16 for line in f:
17     if count ==9:
18         print("------我是分割线-------")
19         count += 1
20         continue
21     print(line)                                 #这种文件的读取方式效率最高，一行一行的读，内存对象一直都只有一行
22     count +=1

 1 #重新读取文件
 2 print(f.tell())             #文件读取光标位置
 3 #print(f.read(50))
 4 #print(f.tell())
 5 print(f.readline())
 6 print(f.readline())
 7 print(f.readline())
 8 print(f.tell())
 9 f.seek(0)                   #文件读取光标移到0，经常与.tell联合使用，以便再次读取文件
10 
11 print(f.encoding)              #数据编码

 1 #Author：ZhangKanghui
 2 
 3 f =open("热爱生命",‘r‘,encoding="utf-8")
 4 f_new =open("热爱生命.bak",‘w‘,encoding="utf-8")
 5 
 6 for line in f:
 7     if "我不去想能否赢得爱情" in line:
 8         line =line.replace("我","你")
 9     f_new.write(line)
10 f.close()
11 f_new.close()

 1 #Author：ZhangKanghui
 2 
 3 data ={
 4     ‘北京‘:{
 5         "朝阳":{
 6             "望京":["奔驰","陌陌"],
 7             "国贸":["CICC","HP"],
 8             "东直门":["Advent","飞信"],
 9         },
10         "昌平":{
11             "沙河":["old boy","test"],
12             "天通苑":["链家地产","我爱我家"],
13         },
14         "海淀": {},
15     },
16     ‘山东‘:{
17         "德州":{},
18         "青岛":{},
19         "济南":{},
20     },
21     ‘广东‘:{
22         "常熟":{},
23         "东莞":{},
24         "惠州":{},
25     },
26 }
27 
28 ‘‘‘
29 while True:
30     for i1 in data:
31         print(i1)
32     choice =input("选择进入1>>:")
33     if choice in data:
34         while True:
35             for i2 in data[choice]:
36                 print("\t\t",i2)
37             choice2 =input("选择进入2>>:")
38             if choice2 in data[choice]:
39                 while True:
40                     for i3 in data[choice][choice2]:
41                         print("\t\t\t\t",i3)
42                     choice3 =input("选择进入3>>:")
43                     if choice3 in data[choice][choice2]:
44                         for i4 in data[choice][choice2][choice3]:
45                              print("\t\t\t\t\t\t",i4)
46                         choice4 =input("最后一层，按b返回>>:")
47                         if choice4 ==‘b‘:
48                              pass
49                     if choice3 == ‘b‘:
50                         break
51             if choice2 == ‘b‘:
52                 break
53 ‘‘‘
54 #为了实现在每一级都能退出  将True换掉
55 exit_tag = False
56 
57 while not exit_tag:
58     for i1 in data:
59         print(i1)
60     choice =input("选择进入1>>:")
61     if choice in data:
62         while not exit_tag:
63             for i2 in data[choice]:
64                 print("\t\t",i2)
65             choice2 =input("选择进入2>>:")
66             if choice2 in data[choice]:
67                 while not exit_tag:
68                     for i3 in data[choice][choice2]:
69                         print("\t\t\t\t",i3)
70                     choice3 =input("选择进入3>>:")
71                     if choice3 in data[choice][choice2]:
72                         for i4 in data[choice][choice2][choice3]:
73                              print("\t\t\t\t\t\t",i4)
74                         choice4 =input("最后一层，按b返回>>:")
75                         if choice4 ==‘b‘:
76                              pass
77                         elif choice4 ==‘q‘:
78                             exit_tag =True
79                     if choice3 == ‘b‘:
80                         break
81                     elif choice3 == ‘q‘:
82                         exit_tag = True
83             if choice2 == ‘b‘:
84                 break
85             elif choice2 == ‘q‘:
86                 exit_tag = True

 1 #Author：ZhangKanghui
 2 
 3 data ={
 4     ‘北京‘:{
 5         "朝阳":{
 6             "望京":["奔驰","陌陌"],
 7             "国贸":["CICC","HP"],
 8             "东直门":["Advent","飞信"],
 9         },
10         "昌平":{
11             "沙河":["old boy","test"],
12             "天通苑":["链家地产","我爱我家"],
13         },
14         "海淀": {},
15     },
16     ‘山东‘:{
17         "德州":{},
18         "青岛":{},
19         "济南":{},
20     },
21     ‘广东‘:{
22         "常熟":{},
23         "东莞":{},
24         "惠州":{},
25     },
26 }
27 
28 while True:
29     for i1 in data:
30         print(i1)
31     choice =input("选择进入1>>:")
32     if choice in data:
33         while True:
34             for i2 in data[choice]:
35                 print("\t\t",i2)
36             choice2 =input("选择进入2>>:")
37             if choice2 == ‘b‘:
38                 break
39             if choice2 in data[choice]:
40                 while True:
41                     for i3 in data[choice][choice2]:
42                         print("\t\t\t\t",i3)
43                     choice3 =input("选择进入3>>:")
44                     if choice3 == ‘b‘:
45                         break
46                     if i3 in data[choice][choice2]:
47                         while True:
48                             for i4 in data[choice][choice2][choice3]:
49                                 print("\t\t\t\t\t\t",i4)
50                             choice4 =input("最后一层，按b返回>>:")
51                             if choice4 ==‘b‘:
52                                 break