Python实现控制台输入密码的方法
本文实例讲述了Python实现控制台输入密码的方法。分享给大家供大家参考。具体如下：
1. raw_input() :
pwd = raw_input('password: ')
print pwd
# password: aaa
# aaa
Note: 最简单的方法，但是不安全
2. getpass.getpass() :
import getpass
pwd = getpass.getpass('password: ')
print pwd
# password:
# aaaa
Note: 很安全，但是看不到输入的位数，会让人觉得有点不习惯，不知道的还以为没有在输入..
3. msvcrt.getch() :
代码如下：
import msvcrt, sys
def pwd_input():
chars = []
while True:
newChar = msvcrt.getch()
if newChar in '\r\n':
# 如果是换行，则输入结束
print ''
break
elif newChar == '\b':
# 如果是退格，则删除末尾一位
if chars:
del chars[-1]
sys.stdout.write('\b')
# 删除一个星号，但是不知道为什么不能执行...
else:
chars.append(newChar)
sys.stdout.write('*')
# 显示为星号
print ''.join(chars)
pwd = pwd_input()
print pwd
# ******
# aaaaaa
Note: 解决了第二种方法不能显示输入位数的问题，但是如果按退格键（backspace）的话，虽然实际的是退格了，
但控制台却没有显示相应的退格，比如，当前输入是：abcd，显示为：****，然后现在打一个退格键，实际
输入为：abc，而显示仍为：****。不知道为什么 sys.stdout.write('\b') 这行没有执行，估计是和使用msvcrt.getch()有关系。感兴趣的朋友可以进一步研究一下。
希望本文所述对大家的Python程序设计有所帮助。
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