python第一天练习题

练习题：

1、答：

编译型开发效率低，因为编译型是每次写完一次代码后打一次，那么就是代码里面有问题的时候，我们需要重新编写代码并且打包。例如：c、c++等

name = "seven"
password = "123"

u_name = input("your name:")
u_password = input("your password:")
if u_name == name and u_password == password :
print("登录成功")
else:
print("登录失败")

name = "seven"
password = "123"
count = 0

while count < 3:
u_name = input("your name:")
u_password = input("your password:")
if u_name == name and u_password == password :
print("登录成功")
else:
print("登录失败")
count += 1

count = 0
while count < 3:
u_name = input("your name:")
u_password = input("your password:")
if u_name == "seven" and u_password == "123" :
print("登录成功")
break
elif u_name == "alex" and u_password == "123" :
print("登录成功")
break
else:
print("登录失败")
count += 1

count = 2
num = 0
while count <=100 :
if count % 2 == 0:
num += count
elif count % 2 != 0:
num -= count
count += 1
print(num)

count = 1
while count < 13:
if count != 6:
print("count", count)
count += 1

count = 0
while count <= 100:
if count % 2 != 0:
print("count",count)
count += 1

count = 1
while count <= 100:
if count % 2 == 0:
print("count",count)
count += 1

name = "nie"
password = "123"
count = 0
while count < 3:
u_name = input("name:")
u_password = input("password:")
if u_name == name and u_password == password:
print("welcome !!!")
break
else:
print("once agine!!!")
count += 1

div={
'list1':{'password':'123456'},
'list2':{'password':'123456'},
'list3':{'password':'123456'},
}
f = open("black_user.txt",'r')
lock_file = f.readlines()
f.close()
count=0
count1=0
while True:
name_input=input("please input name:")
if count == 3:
print("用户名输入次数到达限制")
break
if  not name_input in div:
print("用户名错误")
count +=1
if  name_input in lock_file:
print("户名已锁定，暂停使用！")
exit()

if name_input in div:
count -=2
password_input=str(input("please input password:"))
if password_input == div[name_input]['password']:
print ("密码成功")
break
else:
print("密码错误")
count1 +=1
if count1 == 2:
print("您输入的密码错误次数已达3次，将锁定您的账户!")
f = open('black_user', 'w')
f.write('%s'%name_input)
f.close()
break