随机验证码--random

import random# 1X3Y3ZXdef make_code(size=7):    res = ''    for i in range(size):        # 循环一次则得到一个随机字符（字母/数字）        s = chr(random.randint(65, 90))        num = str(random.randint(0, 9))        res += random.choice([s, num])    return resres=make_code()print(res)

 

打印进度条--格式化字符串

def make_progress(percent,width=50):    if percent > 1:percent=1    show_str=('[%%-%ds]' % width) % (int(percent * width) * '#')    print('\r%s %s%%' %(show_str,int(percent * 100)),end='')total_size=1025recv_size=0while recv_size < total_size:    time.sleep(0.1) # 模拟经过了0.5的网络延迟下载了1024个字节    recv_size+=1024    # 调用打印进度条的功能去打印进度条    percent=recv_size / total_size    make_progress(percent)

'''[#                  ][##                 ][###                ][####               ][#####              ]'''# print('[%-50s]' %'#')# print('[%-50s]' %'##')# print('[%-50s]' %'###')# print('[%-50s]' %'####')# print('[%-50s]' %'#####')# print('%s%%' %50)# 1、控制打印进度条的宽度# res='[%%-%ds]' %50# print(res %'#')# print(res %'##')# print(res %'###')# print(res %'####')# print(res %'#####')#2、不换行+跳回行首打印# import time# print(('\r[%%-%ds]' %50) %'#',end='')# time.sleep(0.5)# print(('\r[%%-%ds]' %50) %'##',end='')# time.sleep(0.5)# print(('\r[%%-%ds]' %50) %'###',end='')# time.sleep(0.5)# print(('\r[%%-%ds]' %50) %'####',end='')# time.sleep(0.5)# print(('\r[%%-%ds]' %50) %'#####',end='')# import time## def make_progress(percent,width=50):#     if percent > 1:percent=1#     show_str=('[%%-%ds]' % width) % (int(percent * width) * '#')#     print('\r%s %s%%' %(show_str,int(percent * 100)),end='')## total_size=1025# recv_size=0# while recv_size < total_size:#     time.sleep(0.1) # 模拟经过了0.5的网络延迟下载了1024个字节#     recv_size+=1024#     # 调用打印进度条的功能去打印进度条#     percent=recv_size / total_size#     make_progress(percent)#1 控制宽度# print('[%s]' %'#')# print('[%-50s]' %'#') #固定宽度# print('[%-%ds]' %50) #宽度不能固定死 传值错误 解决给%d传值的问题 只让%d有意义 %s取消意义# print('[%%-%ds]' %50)# res = '[%%-%ds]' %50  #写活宽度# print(res %'#')        #基于上一步 在给%s 传值#2 不换行 和自动跳到行首  end=''   \r \n# print(('\r[%%-%ds]' %50) %'#',end='')# print(('\r[%%-%ds]' %50) %'##',end='')# print(('\r[%%-%ds]' %50) %'###',end='')

 

re正则模块

"""1、什么是正则    正则就是用一系列具有特殊含义的字符组成一套规则，该规则用来描述具有某一特征的字符串，    正则就是用来去一个大的字符串中匹配出符合规则的子字符串2、为什么要用正则    1、用户注册    2、爬虫程序3、如何用正则"""# import re# print(re.findall('\w','hello 123_ */-='))# print(re.findall('\W','hello 123_ */-='))# print(re.findall('\s','hell\no 12\t3_ */-='))# print(re.findall('\S','hell\no 12\t3_ */-='))# print(re.findall('\d','hell\no 12\t3_ */-='))# print(re.findall('\D','hell\no 12\t3_ */-='))# print(re.findall('\n','hell\no 12\t3_ */-='))# print(re.findall('\t','hell\no 12\t3_ */-='))# print(re.findall('l','hell\no 12\t3_ */-='))# print(re.findall('egon','my name is egon,egon is beautiful'))#                                                      egon# print(re.findall('^egon','egon my name is egon,egon is beautiful'))# print(re.findall('egon$','egon my name is egon,egon is beautifulegon1'))#                                                                egon# 重复匹配# .:匹配换行符以外的任意一个字符# print(re.findall('a.c','abc a1c aac asd aaaaac a*c a+c abasd')) #['abc','a1c','aac','aac','a*c','a+c']#                                                        a.c# print(re.findall('a.c','abc a1c aac a\nc asd aaaaac a*c a+c abasd',re.DOTALL))# []:匹配一个字符,该字符属于中括号内指定的字符# print(re.findall('a..c','abc a1 c aac asd aaaaac a *c a+c abasd ='))# print(re.findall('a.c','abc a1 c aac aAc aBc asd aaaaac a-c a/c a *c a+c abasd = a1c a2c'))# print(re.findall('a[a-z]c','abc a1 c aac aAc aBc asd aaaaac a-c a/c a *c a+c abasd = a1c a2c'))# print(re.findall('a[A-Z]c','abc a1 c aac aAc aBc asd aaaaac a-c a/c a *c a+c abasd = a1c a2c'))# print(re.findall('a[-+*/]c','abc a1 c aac aAc aBc asd aaaaac a-c a/c a *c a+c abasd = a1c a2c'))# print(re.findall('a[a-z][a-z]c','abc a1 c aac aAc aBc asd aaaaac a-c a/c a *c a+c abasd = a1c a2c'))# print(re.findall('a[^a-z]c','abc a1 c aac aAc aBc asd aaaaac a-c a/c a *c a+c abasd = a1c a2c'))# *: 必须与其他字符连用，代表左侧的字符出现0次或者无穷次# print(re.findall('ab*','a ab abbb abbbb a1bbbb a-123'))#                                              ab*#['a','ab','abbb','abbbb','a','a']# print(re.findall('ab{0,}','a ab abbb abbbb a1bbbb a-123'))# ?： 必须与其他字符连用,代表左侧的字符出现0次或者1次# print(re.findall('ab?','a ab abbb abbbb a1bbbb a-123'))#                                              ab?#['a','ab','ab','ab','a','a']# print(re.findall('ab{0,1}','a ab abbb abbbb a1bbbb a-123'))# +： 必须与其他字符连用,代表左侧的字符出现1次或者无穷次# print(re.findall('ab+','a ab abbb abbbb a1bbbb a-123'))#                                              ab+# ['ab','abbb','abbbb']# print(re.findall('ab{1,}','a ab abbb abbbb a1bbbb a-123'))# {n,m}： 必须与其他字符连用# print(re.findall('ab{1,3}','a ab abbb abbbb a1bbbb a-123'))#                                                  ab{1,3}# ['ab','abbb','abbb']# .*：贪婪匹配# print(re.findall('a.*c','ab123adfc1134124123adasfc123123'))# .*?:非贪婪匹配# print(re.findall('a.*?c','ab123adfc1134124123adasfc123123'))#                                            a.*?c#():分组# print(re.findall('expression="(.*?)"','expression="1+2+3/4*5" egon="beautiful"'))#                                       expression=".*?"# print(re.findall('href="(.*?)"','
段落
点我啊
标题
点我啊'))#|：# print(re.findall('a|b','ab123abasdfaf'))#                        a|b# print(re.findall('compan(?:ies|y)','Too many companies have gone bankrupt, and the next one is my company'))#companies   company# print(re.findall(r'a\\c','a\c a1c aAc aac'))# print(re.findall('a\\\\c','a\c a1c aAc aac'))# print(re.findall('ale(x)','alex is SB,alex is bigSB'))# print(re.search('alex','alex is SB,alex is bigSB'))# print(re.search('ale(x)','alex is SB,alex is bigSB').group())# print(re.search('abcdefg','alex is SB,alex is bigSB'))# print(re.search('^alex','123alex is SB,alex is bigSB'))# print(re.match('alex','123alex is SB,alex is bigSB'))# l='egon:18:male'.split(':')# print(l)# l1=re.split('[ :/-]','a-b/c egon:18:male xxx')# print(l1)# print(re.sub('[a-z]+xx','yxp','lxx is good,sb is lllxx wxx is good cxx is good'))#                                                   [a-z]+xx# pattern=re.compile('alex')# print(pattern.findall('alex is SB,alex is bigSB'))# print(pattern.search('alex is SB,alex is bigSB'))

 

sys模块--cp功能--sys.argv

# import sys# sys.path# sys.argv # 用来接收python解释器执行py文件后跟的参数#例如：python cp.py argv1 argv2 arg3#sys.argv=['cp.py','argv1','argv2','argv3']

import sys# print(sys.argv)# src_file=input('请输入源文件路径：')src_file=sys.argv[1]# dst_file=input('请输入目标文件路径：')dst_file=sys.argv[2]with open(src_file,'rb') as read_f,\    open(dst_file,'wb') as write_f:    for line in read_f:        write_f.write(line)

 

subprocess模块---subprocess.Popen

# import os# os.system('tasklist')import subprocessimport timeobj=subprocess.Popen(    'taskliasdfsadfst',    shell=True,    stdout=subprocess.PIPE,    stderr=subprocess.PIPE)# print(obj)# stdout_res=obj.stdout.read()# print(stdout_res.decode('gbk'))# print(stdout_res)stderr_res1=obj.stderr.read()stderr_res2=obj.stderr.read()stderr_res3=obj.stderr.read()# print(stderr_res1.decode('gbk'))print(stderr_res1)print(stderr_res2)print(stderr_res3)# import time# time.sleep(50)

 

os.path.normpath

 

import os# print(os.path.normcase('c:/WIndows\\system32\\')   )# print(os.path.normpath('c://windows\\System32\\../Temp/')   )BASE1_DIR=os.path.dirname(os.path.dirname(os.path.abspath(__file__)))# print(BASE1_DIR)res=os.path.normpath(os.path.join(    os.path.abspath(__file__),    '..',    '..'))print(res)