#1、写函数,利用递归获取斐波那契数列中的第 10 个数,并将该值返回给调用者。
def rec(a,b,dep=1):
c = a + b
if dep == 10:
return c
return rec(b,c,dep+1)
print(rec(5,5))
#2、编写用户登录程序,(读写文本版,可注册用户,修改用户密码)
import os
#注册账号
def zhuce(user,pawd,file):
with open(file, 'r+', encoding='utf-8') as f1:
for line in f1:
if user == line.split(':')[0]:
return False
else:
f1.write(user + ':' + pawd + '
')
return True
#登录账号
def denglu(user,pawd,file):
with open(file, 'r', encoding='utf-8') as f1:
for line in f1:
if '{}:{}'.format(user,pawd) == ''.join(line).strip():
return True
return False
#修改密码
def xiugai(user,pawd,file,new_pawd):
line2 = ''
ret = False
with open(file,'r') as f1,open('fana.bak','w') as f2:
for line in f1:
if '{}:{}'.format(user,pawd) == line.strip():
ret = True
line2 += line.replace(user + ':' + pawd, user + ':' + new_pawd)
else:
line2 +=line
if ret != True:
ret = False
f2.write(line2)
os.remove('fana.txt')
os.rename('fana.bak','fana.txt')
return ret
#注销用户
def zhuxiao(user,pawd,file):
line2 = ''
ret = False
with open(file,'r') as f1,open('fana.bak','w') as f2:
for line in f1:
if '{}:{}'.format(user,pawd) == line.strip():
ret = True
else:
line2 += line
if ret != True:
ret = False
f2.write(line2)
os.remove('fana.txt')
os.rename('fana.bak','fana.txt')
return ret
def taobao(arg):
file = 'fana.txt'
user = input("请输入用户名:")
pawd = input("请输入密码:")
if arg == 'z':
zhu = zhuce(user,pawd,file)
if zhu == False:
print("用户名已存在")
else:
print('注册成功')
elif arg == 'a':
deng = denglu(user,pawd,file)
if deng:
return '欢迎登陆淘宝!'
else:
print('账号或密码错误')
elif arg == 'x':
new_pawd = input("请输入您的新密码")
xiu = xiugai(user,pawd,file,new_pawd)
if xiu:
print("密码修改成功")
else:
print("账号或密码错误")
elif arg == 'e':
xiao = zhuxiao(user,pawd,file)
if xiao:
print("账号注销成功")
else:
print("账号或密码错误")
while True:
jd = input("注册请按:z,登陆请按:a,退出按:q >>")
if jd.lower() == 'z':
taobao('z')
elif jd.lower() == 'a':
ta = taobao('a')
if ta == '欢迎登陆淘宝!':
print('欢迎登陆淘宝!')
se = input('修改密码:x,注销:e >>')
if se == 'x':
print('修改密码前!',end='')
taobao('x')
elif se == 'e':
print('注销账号前!', end='')
taobao('e')
else:
print('请按照提示输入!')
elif jd.lower() == 'q':
print('退出成功')
break
else:
print("请按照提示输入!")