Use the while loop to input 1 2 3 4 5 6 8 9 10
a = 1
while a < 11:
if a == 7:
pass
else:
print(a)
a = a + 1
Find the sum of all numbers 1-100
a = 1
sum = 0
while a < 101:
sum = sum + a
a = a + 1
print(sum)
Output 1-100 all even numbers
a = 1
while a < 101:
temp = a % 2
if temp == 0:
print(a)
else:
pass
Find the sum of all trees in 1-2+3-4+5...99
a = 1
sum = 0
while a < 100:
temp = a % 2
if temp == 0:
sum = sum - a
else:
sum = sum + a
a = a + 1
print(sum)
Python judges three login password errors
method one:
passwd = "abcd1234"
huoqu = input("请输入核验身份密码:")
if huoqu == passwd:
print("密码正确")
else:
print("密码错误")
huoqu = input("请重新输入:")
if huoqu == passwd:
print("密码正确")
else:
print("密码错误")
huoqu = input("请重新输入:")
if huoqu == passwd:
print("密码正确")
else:
print("三次机会错误请重试")
Method Two:
passwd = "abcd1234"
huoqu = input("请输入核验身份密码:")
srcs = 1
while srcs < 3:
if huoqu == passwd:
print("密码正确")
srcs = 3
else:
print("密码错误")
huoqu = input("请重新输入:")
srcs = srcs + 1
if srcs == 3:
print("三次错误请重试")