1. 所有字母（大小写）数字和下划线的列表或字串，不用记ASCII范围
list(map(chr,[*range(ord('A'),ord('Z')+1),*range(ord('a'),ord('z')+1),*range(ord('0'),ord('9')+1),ord('-')])) ''.join((map(chr,[*range(ord('A'),ord('Z')+1),*range(ord('a'),ord('z')+1),*range(ord('0'),ord('9')+1),ord('-')]))) # => 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-'
2. 口令密码是否有效：至少8位，大写字母、小写字母、数字每类至少一个
def validPin(str): import re return None!=re.match(r"^(?:(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9]))\S{8,}$",str) # 或者： from string import ascii_lowercase as L,ascii_uppercase as U,digits as D ValidPin = lambda s:all([len(s)>=8,any([i in L for i in s]),any([i in U for i in s]),any([i in D for i in s])])
3. 口令密码等级：多一类字符就高一级，长度不够判定无效
def level(pin): import string dic = {0:"无效",1:"弱",2:"中低",3:"中高",4:"强"} lib = {1:string.ascii_lowercase,2:string.ascii_uppercase,3:string.digits,4:',.!;?<>'} pinlevel = 0 for v in lib.values(): for p in pin: if p in v: pinlevel += 1 break return dic[pinlevel * len(pin)>=8] + '密码' print(level(input()))
4. 判断二月份天数，直接用28+闰年判别式
def MaxDayMonth(year, month): days = 31,28+(year%4==0 and year%100!=0 or year%400==0),31,30,31,30,31,31,30,31,30,31 return 0 if (month<1 or month>12) else days[month-1] def DayofYear(year, month, day): days = 31,28+(year%4==0 and year%100!=0 or year%400==0),31,30,31,30,31,31,30,31,30,31 return sum(days[:month-1]) + day
5. 继承父类属性的三种写法
class Animal: def __init__(self, name): self.name = name class Cat(Animal): def __init__(self, name, age): super().__init__(name) #第一种 #super(Cat,self).__init__(name) #第二种 #Animal.__init__(self,name) #第三种 self.age = age def cry (self): print("喵~~~我是{}，我{}岁了".format(self.name,self.age)) class Dog(Animal): def __init__(self, name, color): super().__init__(name) #super(Dog,self).__init__(name) #Animal.__init__(self, name) self.color = color def bark(self): print("汪~~~我是{}，我穿着{}的外套".format(self.name,self.color)) cat = Cat('小花', 3) cat.cry() dog = Dog('小黄', '红色') dog.bark()
附录 string库常用字串和内置方法
import string
string.ascii_letters 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' string.ascii_lowercase 'abcdefghijklmnopqrstuvwxyz' string.ascii_uppercase 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' string.digits '0123456789' string.hexdigits '0123456789abcdefABCDEF' string.hexdigits '0123456789abcdefABCDEF' string.octdigits '01234567' string.printable '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c' string.punctuation '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~' string.whitespace ' \t\n\r\x0b\x0c' s = 'abcdaefgahijkalmn' string.capwords(s,'a') 'aBcdaEfgaHijkaLmn' s = 'hello,$a world$b' t = string.Template(s) t.substitute({'a':'间隔','b':'!!!'}) 'hello,间隔 world!!!' formatter = string.Formatter() formatter.format('第{}页/共{}页', *{3,23}) '第3页/共23页'
