python - 使用正则表达式时如何连接多个 if 语句？

Question

下面是至少一个小写，一个大写和一个数字的密码验证过程的代码。

import re
password=raw_input('Enter the Password')

x= (re.findall(r'[a-z]',password))
if len(x)==0:
   print " at least one 'a-z' requirment not completed"
else:
   #(what should i write here to connect this to the next step?)

y=(re.findall(r'[A-Z',password))
if len(y)==0:
   print "at least one 'A-Z' requirement not completed"
else:
   #(what should i write here?)

z=(re.findall(r'[0-9]',password))

if len(z)==0:
   print "at least one '0-9' requirment not completed"
else:
  print ' Good password!'

我的愿望是让 Python 以这样一种方式运行:如果 x 不为 0，则继续验证 y 是否等于 0。如果不等于，验证 z 不等于 0。如果不等于，告诉用户密码正确。

Answer 1

使用if-elif语句:

import re
password=raw_input('Enter the Password')

if len(re.findall(r'[a-z]',password))==0:
    print " at least one 'a-z' requirment not completed"
elif len(re.findall(r'[A-Z]',password)) == 0:
    print "at least one 'A-Z' requirement not completed"
elif len(re.findall(r'[0-9]',password)) == 0:
    print "at least one '0-9' requirment not completed"
else:
    print ' Good password!'

演示:

Enter the Password  Axa3
 Good password!

Enter the Password  aa3
at least one 'A-Z' requirement not completed

Enter the Password  A3443E
 at least one 'a-z' requirment not completed