用Python程序检查密码的有效性？
给定密码，我们的任务是检查该密码是否有效。在这里，我们使用提供正则表达式的re模块，并使用re.search()来检查字母，数字或特殊字符的有效性。
算法
Step 1: first we take an alphanumeric string as a password. Step 2: first check that this string should minimum 8 characters. Step 3: the alphabets must be between a-z. Step 4: At least one alphabet should be in Uppercase A-Z. Step 5: At least 1 number or digit between 0-9. Step 6: At least 1 character from [_ or @ or $].
范例程式码
# Python program to check valid password
import re
passw = input("Enter Password ::>")
fl = 0
while True:
if (len(passw)<8):
fl= -1
break
elif not re.search("[a-z]", passw):
fl = -1
break
elif not re.search("[A-Z]", passw):
fl = -1
break
elif not re.search("[0-9]", passw):
fl = -1
break
elif not re.search("[_@$]", passw):
fl = -1
break
elif re.search("\s", passw):
fl = -1
break
else:
fl = 0
print(" This Is Valid Password")
break
if fl ==-1:
print("Not a Valid Password")输出结果
Enter Password ::> vbnA@hj9 This Is Valid Password