今天讲的两个模块都没啥意思，可能是因为目前接触的不多，感觉用处不是很大，今天主要是用re正则表达式做一个计算器，模拟了一下eval到底是怎么操作的
一、configparser模块
import configparser # 来看一个好多软件的常见文档格式如下： # [DEFAULT] # ServerAliveInterval = 45 # Compression = yes # CompressionLevel = 9 # ForwardX11 = yes # # [bitbucket.org] # User = hg # # [topsecret.server.com] # Port = 50022 # ForwardX11 = no # 引入configpraser模块实现以上文件编辑 # config = configparser.ConfigParser() # config["DEFAULT"] = {‘ServerAliveInterval‘: ‘45‘, # ‘Compression‘: ‘yes‘, # ‘CompressionLevel‘: ‘9‘} # # config[‘bitbucket.org‘] = {} # config[‘bitbucket.org‘][‘User‘] = ‘hg‘ # config[‘topsecret.server.com‘] = {} # topsecret = config[‘topsecret.server.com‘] # topsecret[‘Host Port‘] = ‘50022‘ # mutates the parser # topsecret[‘ForwardX11‘] = ‘no‘ # same here # config[‘DEFAULT‘][‘ForwardX11‘] = ‘yes‘ < br > # with open(‘example.ini‘, ‘w‘) as configfile: # config.write(configfile) # 关于configpraser的增删改查 import configparser # config = configparser.ConfigParser() # # 查 # print(config.sections()) #[] # # config.read(‘example.ini‘) # # print(config.sections()) #[‘bitbucket.org‘, ‘topsecret.server.com‘] # # print(‘bytebong.com‘ in config)# False # # print(config[‘bitbucket.org‘][‘User‘]) # hg # # print(config[‘DEFAULT‘][‘Compression‘]) #yes # # print(config[‘topsecret.server.com‘][‘ForwardX11‘]) #no # # # for key in config[‘bitbucket.org‘]: # print(key) # # # # user # # serveraliveinterval # # compression # # compressionlevel # # forwardx11 # # # print(config.options(‘bitbucket.org‘))#[‘user‘, ‘serveraliveinterval‘, ‘compression‘, ‘compressionlevel‘, ‘forwardx11‘] # print(config.items(‘bitbucket.org‘)) #[(‘serveraliveinterval‘, ‘45‘), (‘compression‘, ‘yes‘), (‘compressionlevel‘, ‘9‘), (‘forwardx11‘, ‘yes‘), (‘user‘, ‘hg‘)] # # print(config.get(‘bitbucket.org‘,‘compression‘))#yes # # # 删,改,增(config.write(open(‘i.cfg‘, "w"))) # # # config.add_section(‘yuan‘) # # config.remove_section(‘topsecret.server.com‘) # config.remove_option(‘bitbucket.org‘,‘user‘) # # config.set(‘bitbucket.org‘,‘k1‘,‘11111‘) # # config.write(open(‘i.cfg‘, "w")) #
二、hashlib模块
import hashlib # 用于加密相关的操作，3.x里代替了md5模块和sha模块，主要提供 SHA1, SHA224, SHA256, SHA384, SHA512 ，MD5 算法 # import hashlib # # m = hashlib.md5() # m=hashlib.sha256() # # m.update(‘hello‘.encode(‘utf8‘)) # print(m.hexdigest()) # 5d41402abc4b2a76b9719d911017c592 # # m.update(‘alvin‘.encode(‘utf8‘)) # # print(m.hexdigest()) # 92a7e713c30abbb0319fa07da2a5c4af # # m2 = hashlib.md5() # m2.update(‘helloalvin‘.encode(‘utf8‘)) # print(m2.hexdigest()) # 92a7e713c30abbb0319fa07da2a5c4af # 以上加密算法虽然依然非常厉害，但时候存在缺陷，即：通过撞库可以反解。所以，有必要对加密算法中添加自定义key再来做加密。 # import hashlib # # # ######## 256 ######## # # hash = hashlib.sha256(‘898oaFs09f‘.encode(‘utf8‘)) # hash.update(‘alvin‘.encode(‘utf8‘)) # print(hash.hexdigest()) # e79e68f070cdedcfe63eaf1a2e92c83b4cfb1b5c6bc452d214c1b7e77cdfd1c7 # python 还有一个 hmac 模块，它内部对我们创建 key 和 内容 再进行处理然后再加密: # import hmac # h = hmac.new(‘alvin‘.encode(‘utf8‘)) # h.update(‘hello‘.encode(‘utf8‘)) # print (h.hexdigest())#320df9832eab4c038b6c1d7ed73a5940
三、re正则的计算器（还不是很完善，和我算的结果一样，就是不知道为啥和eval的不一样）
import re def hefa(test): l_kuohao = re.findall(‘\(‘,test) # print(len(l_kuohao)) r_kuohao = re.findall(‘\)‘,test) # print(len(r_kuohao)) zimu = re.findall(‘[a-z\|A-Z]+‘,test) # print(len(zimu)) xiaoshudian = re.findall(r‘\.\.‘,test) # print(len(xiaoshudian)) if len(l_kuohao) ==len(r_kuohao) and len(zimu) == 0 and len(xiaoshudian) == 0: return True else: return False def input_1(): while True: test = input(‘请输入计算内容>>>‘) if hefa(test) == True: break else: print(‘请重新输入‘) return test def cheng(test): test = test.replace(‘--‘,‘+‘) test = test.replace(‘+-‘,‘-‘) test = test.replace(‘ ‘, ‘‘) while True: if len(re.findall(‘[*/]‘,test)) != 0 : test_chchu = re.search(‘-?\d+\.?\d*[*/]-?\d+\.?\d*‘,test).group() if len(re.split(‘\*‘,test_chchu)) == 2: test_ji =float(re.split(‘\*‘,test_chchu)[0].strip()) * float(re.split(‘\*‘,test_chchu)[1].strip()) test = test.replace(test_chchu,str(test_ji)) else: test_chu = float(re.split(‘\/‘,test_chchu)[0].strip()) / float(re.split(‘\/‘,test_chchu)[1].strip()) test = re.sub(test_chchu,str(test_chu),test) else: break return test def add_(test): test = test.replace(‘--‘,‘+‘) test = test.replace(‘+-‘,‘-‘) test = test.replace(‘ ‘,‘‘) test_list = re.findall(‘-?\d+\.?\d*‘,test) a = 0 for i in test_list: a += float(i) test = str(a) # while True: # # print(len(re.findall(‘-?\d+\.?\d*[+\-]-?\d+\.?\d*‘,test))) # if len(re.findall(‘-?\d+\.?\d*[+\-]-?\d+\.?\d*‘,test)) != 0 : # test_jiajian = re.search(‘-?\d+\.?\d*[+\-]-?\d+\.?\d*‘,test).group() # if len(re.split(‘\+‘,test_jiajian)) == 2: # test_he =float(re.split(‘\+‘,test_jiajian)[0].strip()) + float(re.split(‘\+‘,test_jiajian)[1].strip()) # test = test.replace(test_jiajian,str(test_he)) # else: # test_cha = float(re.split(r‘-‘,test_jiajian)[0].strip()) - float(re.split(r‘-‘,test_jiajian)[1].strip()) # test = re.sub(test_jiajian,str(test_cha),test) # else: # break return test def kuohao(test): # print(type(test),test) test_old = re.search(‘\([^()]*\)‘,test).group() # print(type(test_old),test_old) test_old_lone = test_old.replace(‘(‘, ‘‘) # print(test_old_lone) test_old_lone = test_old_lone.replace(‘)‘, ‘‘) # print(test_old_lone) a = cheng(test_old_lone) # print(a) test_new = add_(a) # print(type(test_new),test_new) test = test.replace(test_old, test_new) # print(test) return test if __name__ == ‘__main__‘: # test = input_1() test = ‘1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )‘ test = test.replace(‘ ‘,‘‘) print(test) while True: if len(re.findall(‘\(‘,test)) != 0 : test = kuohao(test) print(test) else: break a = cheng(test) # print(type(a),a) test_new = add_(a) print(type(test_new),test_new) print(eval(‘1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )‘)) if test_new == eval(test): print(test_new)
今天结束的好早，好开心，要睡觉了
来看一个好多软件的常见文档格式如下：
Python之旅的第18天（configparser、hashlib模块）
原文：https://www.cnblogs.com/xiaoyaotx/p/12466392.html