Trick：纯demo，心在哪里，结果就在那里
# -*- coding: utf-8 -*- # Author : szy # Create Date : 2019/10/17 from random import randint as shanshanzi import operator # del # aList = [1, 2, 3] # del aList # print(aList) # help("list.sort") # lambda 排序 # data = [] # data.append({"province": "shanghai", "order_price": 200, "user_count": 50, "total_price": 10000}) # data.append({"province": "beijing", "order_price": 100, "user_count": 100, "total_price": 10000}) # data.append({"province": "shenzhen", "order_price": 300, "user_count": 100, "total_price": 30000}) # sort排序，reverse=True倒排，key按照某种关系排序 # data.sort(key=lambda x: (x['user_count'], -x['total_price']), reverse=True) # data.sort(key=lambda x: (x['province']), reverse=True) # print(data) # for d in data: # print(d) # 对象比较支持多个比较操作 # print(3 < 4 < 7) # 相当于 (3<4) and (4<7) # print(4 > 3 == 3) # 相当于 (4>3) and (3==3) # print(4 < 3 < 8 != 2 < 7) # 从左到右 # Java中的Collections.reverse(arrayList); # foolist = [123, 'abc', 342.23, 'xyz'] # print(foolist[::-1]) # print(foolist[::-2]) # Java中的Collections.sort(arrayList); # print(sorted(foolist)) # is 对象的内存最终指向的地址 # == 对象最终指向的数值 # foo1 = foo2 = 4.3 # print(foo1 == foo2) # print(foo1 is foo2) # # foo1 = 4.3 # foo2 = foo1 # print(foo1 == foo2) # print(foo1 is foo2) # # print(id(foo1)) # print(id(foo2)) # # # foo1 = 4.3 # foo2 = 1.3 + 3.0 # print(foo1 == foo2) # print(foo1 is foo2) # # print(id(foo1)) # print(id(foo2)) # cmp(a,b) 比较大小 -1, 0 ,1 # print(operator.le(7, 7)) # print(operator.eq("abs", "azs")) # round() 四舍五入 # print(round(100.10)) # print(round(100.49)) # print(round(100.50)) # random 取随机数 # print(shanshanzi(1, 100)) # in 操作 # print('bc' in 'abcd') # print('n' in 'abcd') # print('nm' not in 'abcd') # string 模块 # print("hello".capitalize()) # print("HELLO".lower()) # print("hello".upper()) # print("asdadada asdada".split()) # print(" adsd ".rstrip()) # print(" adsd ".lstrip()) # print(" ad sd ".strip()) # # re 模块 import re # Python提供了两种不同的原始操作:match和search.match是从字符串的起点开始做匹配,而search是从字符串做任意匹配. print("-----------------------------------------") m = re.search("^ab+", "asdfabbbb") print(m) m = re.search("ab+", "asdfabbbb") print(m) print(m.group()) m = re.match("c", "cabcdef") print(m.group()) pattern = re.compile("c") m = pattern.match("cabcdef") print(m.group())
