python中flag的用法_python中“标志位”的使用

a=['a',1,2,3,4]

b=['b',1,2,3,4]

c=['c',1,2,3,4]

d=['d',1,2,3,4]

break_flag=0

while break_flag==0:

y_n=input('a,yes or no:')

if y_n == 'no':

break

elif y_n == 'yes':

for i in a:

print(i)

while break_flag ==0:

y_n_2=input('b,yes or no:')

if y_n_2=='no':

print('退出')

break_flag=1

elif y_n_2=='yes':

for j in b:

print(j)

while break_flag==0:

y_n_3=input('c,yes or no:')

if y_n_3 == 'no':

print('退出。。。')

break_flag=1

elif y_n_3 == 'yes':

for k in c:

print(k)

while break_flag == 0:

y_n_4 = input('d,yes or no:')

if y_n_4=='no':

print('退出')

break_flag =1

elif y_n_4 =='yes':

for n in d:

print(n)

if break_flag==1:

break