常用模块3

# hashlib模块

# 1、什么叫hash:hash是一种算法，该算法接受传入的内容，经过运算得到一串hash值
# 2、hash值的特点是：
#2.1 只要传入的内容一样，得到的hash值必然一样=====>要用明文传输密码文件完整性校验
#2.2 不能由hash值返解成内容=======》把密码做成hash值，不应该在网络传输明文密码
#2.3 只要使用的hash算法不变，无论校验的内容有多大，得到的hash值长度是固定的
# import hashlib
# m=hashlib.md5()
# m.update('hello word '.encode('utf-8'))
# print(m.hexdigest())  #e5ab6c6313657418d6a58f0e369d1e1d

# 文件生成hash值
# import hashlib
# m=hashlib.md5()
# with open(r'D:python练习day.18dos.py','rb')as f:
#     for line in f:
#         m.update(line)
#         hv=m.hexdigest()
#         print(hv)
# hash值
#17133f25421d160b1d8386e1ced19b14
# 09f1651800a15fa2ecde2ab3cba357d4
# 5d8bbdcde98b5454678afd55c774f965
# 5e921783ca2111d70eb810d64e9f9495
# 071cb6a398992f6ea18751d06bffb4b0
# 2f99326787fac41196cbe6c262986e59
# 11b3b5fcf50c077c1aabc616abbb5759
# ecda66e62aaee8095da6da7f93a561aa
# df74acf08aa3255cf467ed9777564952
# 398c3e50311756403a1855a089840cc5
# 55576b5b403db77484e5df188c3022f2
# 34b0178aa75ad890970e2b5387a1ff97
# 2b9f58825663c1fcd3964a6266e01351
# eaefcee5737461ee4a5aadd51e8ec9df
# f906c4ea15b81e07b77504e1b5db4921
# 21cd49cf3182d24e65df4207d6b557b2
# e6bee699b0597dd59271e29f3a4e946f
# 密码加盐：
# import hashlib
# pwd='alex3714'
#
# m=hashlib.md5()
# m.update('天王盖地虎'.encode('utf-8'))
# m.update(pwd.encode('utf-8'))
# m.update('提莫一米五'.encode('utf-8'))
# print(m.hexdigest())


# subprocess模块

# import os
#
# res=os.system('dixCVr')
# print('运行结果：',res)

# import subprocess
# 
# obj=subprocess.Popen('dir',
#                      shell=True,
#                      stdout=subprocess.PIPE,
#                      stderr=subprocess.PIPE
#                      )

# print(obj)

# res1=obj.stdout.read()
# print('正确结果1111: ',res1)
# 
# res2=obj.stdout.read()
# print('正确结果2222: ',res2) #只能取一次，取走了就没有了
# 

# configparser模块


# mport configparser
# 
# config=configparser.ConfigParser()
# config.read('my.ini')
# 
# # secs=config.sections()
# # print(secs)
# 
# # print(config.options('egon'))
# 
# # age=config.get('egon','age')`
# # age=config.getint('egon','age')
# # print(age,type(age))
# 
# # salary=config.getfloat('egon','salary')
# # print(salary,type(salary))
# 
# b=config.getboolean('egon','is_beatifull')
# print(b,type(b))