python表达式if-for-while

死循环and跳出

 While true

lucky_num = 27

while True:  ##死循环

    input_num = int(input("input your guess number: "))

    if input_num == lucky_num:
        print("bingo!")
        break   ##跳出循环

    elif input_num > lucky_num:
        print("the real number is smaller!")
    else:
        print("the real number is biger!")

 

C:\Python36\python.exe C:/Users/7KM/PycharmProjects/s18/s18/day1/namber.py

input your guess number: 12

the real number is biger!

input your guess number: 27

bingo!

 

进程已结束,退出代码0

 

 非While true

luck_num=27
input_num=-1
while input_num != luck_num:
    input_num = int(input("please input your guess number:"))
    if input_num < luck_num:
        print ("your input smaller ,try input agein")
    elif input_num > luck_num:
        print ("your input bigger ,try input agein")
print("bingo")

 

please input your guess number:22

your input smaller ,try input agein

please input your guess number:33

your input bigger ,try input agein

please input your guess number:27

bingo

 

进程已结束,退出代码0

 

 计数器限制

luck_num = 27
input_num = -1
count = 0
while input_num != luck_num and count <3:
    #print ("input count:" ,count)
    input_num = int(input("please input your guess number:"))
    if input_num < luck_num:
        print ("your input smaller ,try input agein")
    elif input_num > luck_num:
        print ("your input bigger ,try input agein")
    #count = count + 1
    count += 1
if luck_num == input_num:
    print("bingo")
else:
    print("too many tries!")

 

luck_num = 27
input_num = -1
count = 0
#while input_num != luck_num and count <3:
while count < 3:
    #print ("input count:" ,count)
    input_num = int(input("please input your guess number:"))
    if input_num < luck_num:
        print ("your input smaller ,try input agein")
    elif input_num > luck_num:
        print ("your input bigger ,try input agein")
    #count = count + 1
    #count += 1
    else:
        print("bingo")
        break
    count += 1
else:
    print("too many tries!")

 for 循环

luck_num = 27
input_num = -1
count = 0
#while input_num != luck_num and count <3:
for i in range (3);
    #print ("input count:" ,count)
    input_num = int(input("please input your guess number:"))
    if input_num < luck_num:
        print ("your input smaller ,try input agein")
    elif input_num > luck_num:
        print ("your input bigger ,try input agein")
    #count = count + 1
    #count += 1
    else:
        print("bingo")
        break
    count += 1
else:
    print("too many tries!")