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#字符串替换import sysf = open("yesterday2","r",encoding="utf-8")f_new = open("yesterday2.bak","w",encoding="utf-8")find_str = sys.argv[1]replace_str = sys. 阅读全文
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#w写模式，r读模式,a追加，r+读写,w+写读，a+追加读，rb二级制格式读文件，wb写二级制文件 '''f = open('yesterday','a+',encoding='utf-8') #文件句柄（文件内存对象）： f = open('yesterday','r+',encoding='u 阅读全文
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#集合是无序的list_1 = [1,3,4,5,7,3,6,7,9]list_1 = set(list_1) #集合去重list_2 = set([2,6,0,66,22,8,4])#交集print(list_1.intersection(list_2))#并集print(list_1.union 阅读全文
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name = 'my name is {name} and i am {year} old'print(name.capitalize()) #首字母：My name alexprint(name.count("a")) #统计a ：2print(name.center(50,"-")) #补足50 阅读全文
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1、浅COPY，如果源变化,p1[1][1]、p2[1][1]、person[1][1]会一起变化 import copyperson = ['name',['saving',100]]'''p1 = copy.copy(person)p2 = person[:]p3 = list(person)' 阅读全文
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product_list = [ ('IPhone',5800), ('Mac Pro',12000), ('Starbuck Latte',31), ('Alex Python',81), ('Bike',800)]shopping_list = []salary = input('Input y 阅读全文
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#decoding转为字符串：解码；encode转为二进制：转码msg = "我爱北京天安门"print(msg.encode()) #encode默认utf-8print(msg.encode(encoding="utf-8").decode(encoding="utf-8")) 阅读全文
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sys.path的输出： ['C:\\Users\\Administrator\\PycharmProjects\\S14\\Day2' 'C:\\Users\\Administrator\\PycharmProjects\\S14' 'C:\\Program Files\\Python36\\py 阅读全文
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import getpass_username = 'wu'_password = 'wu123'username = input("username:")#password = getpass.getpass("password:") #密文输入password = input("password 阅读全文
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