Python常用知识点汇总

 class set(object): """ set() -> new empty set object set(iterable) -> new set object Build an unordered collection of unique elements. """ def add(self, *args, **kwargs): # real signature unknown """ Add an element to a set，添加元素 This has no effect if the element is already present. """ pass def clear(self, *args, **kwargs): # real signature unknown """ Remove all elements from this set. 清楚内容""" pass def copy(self, *args, **kwargs): # real signature unknown """ Return a shallow copy of a set. 浅拷贝 """ pass def difference(self, *args, **kwargs): # real signature unknown """ Return the difference of two or more sets as a new set. A中存在，B中不存在 (i.e. all elements that are in this set but not the others.) """ pass def difference_update(self, *args, **kwargs): # real signature unknown """ Remove all elements of another set from this set. 从当前集合中删除和B中相同的元素""" pass def discard(self, *args, **kwargs): # real signature unknown """ Remove an element from a set if it is a member. If the element is not a member, do nothing. 移除指定元素，不存在不保错 """ pass def intersection(self, *args, **kwargs): # real signature unknown """ Return the intersection of two sets as a new set. 交集 (i.e. all elements that are in both sets.) """ pass def intersection_update(self, *args, **kwargs): # real signature unknown """ Update a set with the intersection of itself and another. 取交集并更更新到A中 """ pass def isdisjoint(self, *args, **kwargs): # real signature unknown """ Return True if two sets have a null intersection. 如果没有交集，返回True，否则返回False""" pass def issubset(self, *args, **kwargs): # real signature unknown """ Report whether another set contains this set. 是否是子序列""" pass def issuperset(self, *args, **kwargs): # real signature unknown """ Report whether this set contains another set. 是否是父序列""" pass def pop(self, *args, **kwargs): # real signature unknown """ Remove and return an arbitrary set element. Raises KeyError if the set is empty. 移除元素 """ pass def remove(self, *args, **kwargs): # real signature unknown """ Remove an element from a set; it must be a member. If the element is not a member, raise a KeyError. 移除指定元素，不存在保错 """ pass def symmetric_difference(self, *args, **kwargs): # real signature unknown """ Return the symmetric difference of two sets as a new set. 对称交集 (i.e. all elements that are in exactly one of the sets.) """ pass def symmetric_difference_update(self, *args, **kwargs): # real signature unknown """ Update a set with the symmetric difference of itself and another. 对称交集，并更新到a中 """ pass def union(self, *args, **kwargs): # real signature unknown """ Return the union of sets as a new set. 并集 (i.e. all elements that are in either set.) """ pass def update(self, *args, **kwargs): # real signature unknown """ Update a set with the union of itself and others. 更新 """ pass 

 se = {11,22,33,44,55} be = {44,55,66,77,88} # se.add(66) # print(se)  #添加元素，不能直接打印！ # # # # se.clear() # print(se)     #清除se集合里面所有的值，不能清除单个 # # # # ce=be.difference(se)  #se中存在，be中不存在的值，必须赋值给一个新的变量 # print(ce) # # # se.difference_update(be) # print(se)         #在se中删除和be相同的值，不能赋值给一个新的变量，先输入转换，然后打印，也不能直接打印！ # se.discard(11) # print(se)          #移除指定元素，移除不存在的时候，不会报错 # se.remove(11) # print(se)       #移除指定的元素，移除不存在的会报错 # se.pop() # print(se)        #移除随机的元素 # # # ret=se.pop() # print(ret)       #移除元素，并且可以把移除的元素赋值给另一个变量 # ce = se.intersection(be) # print(ce)    #取出两个集合的交集（相同的元素） # se.intersection_update(be) # print(se)    #取出两个集合的交集，并更新到se集合中 # ret = se.isdisjoint(be) # print(ret)     #判断两个集合之间又没有交集，如果有交集返回False，没有返回True # ret=se.issubset(be) # print(ret)     #判断se是否是be集合的子序列，如果是返回True，不是返回Flase # ret = se.issuperset(be) # print(ret)     #判断se是不是be集合的父序列，如果是返回True，不是返回Flase # ret=se.symmetric_difference(be) # print(ret)     #对称交集，取出除了不相同的元素 # se.symmetric_difference_update(be) # print(se)     #对称交集，取出不相同的元素并更新到se集合中 # ret = se.union(be) # print(ret)     #并集，把两个元素集合并在一个新的变量中 

 import copy # ######### 数字、字符串 ######### n1 = 123 # n1 = "i am alex age 10" print(id(n1)) # ## 赋值 ## n2 = n1 print(id(n2)) # ## 浅拷贝 ## n2 = copy.copy(n1) print(id(n2)) # ## 深拷贝 ## n3 = copy.deepcopy(n1) print(id(n3)) 

 n1 = {"k1": "zhangyanlin", "k2": 123, "k3": ["Aylin", 456]} n2 = n1 

 import copy n1 = {"k1": "zhangyanlin", "k2": 123, "k3": ["aylin", 456]} n3 = copy.copy(n1) 

 def 发送短信(): 发送短信的代码... if 发送成功: return True else: return False while True: # 每次执行发送短信函数，都会将返回值自动赋值给result # 之后，可以根据result来写日志，或重发等操作 result = 发送短信() if result == False: 短信发送失败... 

 def func(*args): print args # 执行方式一 func(11,33,4,4454,5) # 执行方式二 li = [11,2,2,3,3,4,54] func(*li) 　　 

 def func(**kwargs): print args # 执行方式一 func(name＝'wupeiqi',age=18) # 执行方式二 li = {'name':'wupeiqi', age:18, 'gender':'male'} func(**li) 

 　def func(*args, **kwargs): print args print kwargs 

 def email(p,j,k): import smtplib from email.mime.text import MIMEText from email.utils import formataddr set = True try: msg = MIMEText('j', 'plain', 'utf-8') #j 邮件内容 msg['From'] = formataddr(["武沛齐",'wptawy@126.com']) msg['To'] = formataddr(["走人",'424662508@qq.com']) msg['Subject'] = "k" #k主题 server = smtplib.SMTP("smtp.126.com", 25) server.login("wptawy@126.com", "WW.3945.59") server.sendmail('wptawy@126.com', [p], msg.as_string()) server.quit() except: set = False return True formmail = input("请你输入收件人邮箱：") zhuti  = input("请您输入邮件主题：") neirong = input("请您输入邮件内容：") aa=email(formmail,neirong,zhuti) if aa: print("邮件发送成功!") else: print("邮件发送失败!")