第一种方法:使用装饰器defsingleton(cls):instances={}defwrapper(*args,**kwargs):ifclsnotininstances:...
a.整型int、长整型long、浮点型float、复数complexb.字符串str、列表list、元祖tuplec.字典dict、集合setd.Python3中没有long，只有无限精度的int
a.在python里凡是继承了object的类，都是新式类b.Python3里只有新式类c.Python2里面继承object的是新式类，没有写父类的是经典类d.经典类目前在Python里基本没有应用e.保持class与ty...
A,B中相同元素：print(set(A)&set(B))A,B中不同元素:print(set(A)^set(B))
l1=[&039;b&039;,&039;c&039;,&039;d&039;,&039;c&039;,&039;a&039;,&039;a&039;]l2=list(set(l1))print(l2)用list类的sor...
list1=[1,2,3]list2=[3,4,5]set1=set(list1)set2=set(list2)print(set1&set2)print(set1^set2)
print([x*11forxinrange(10)])
list=[&039;a&039;,&039;b&039;,&039;c&039;,&039;d&039;,&039;e&039;]print(list[10:])代码将输出[],不会产生IndexError错误，就像所期望的那...
alist=[{&039;name&039;:&039;a&039;,&039;age&039;:20},{&039;name&039;:&039;b&039;,&039;age&039;:30},{&039;name&039;:...
str1="k:1|k1:2|k2:3|k3:4"defstr2dict(str1):dict1={}foritermsinstr1.split(&039;|&039;):...
print("aStr"[::-1])
d={key:valuefor(key,value)initerable}
sorted(d.items(),key=lambdax:x[1])x[0]代表用key进行排序；x[1]代表用value进行排序。
importrandomalist=[1,2,3,4,5]random.shuffle(alist)print(alist)
importdatetimedefdayofyear():year=input("请输入年份:")month=input("请输入月份:")day...
