python笔记：控制结构

#!python
#filename if.py
number =23
guess= int(input('Enter an integer:'))

if guess==number:
    print('Congratulations, you guessed it.')
    print('(but you do not win any prizes!)')
elif guess
    print('No, it is a little highter than that')
else:
    print('No, it is a little lower than that')

print('Dnoe')

#!python
#filename while.py
number=23
running=True

while running:
    guess=int(input('Enter a integer:'))

    if guess==number:
        print('Congratulations, you guessed it.')
        running=False
    elif guess< number:
        print('No, it is a little highter that that.')
    else:
        print('No, it is a little lower that that')
else:
    print('The while loop is over.')

print('Done')   

#!python
#filename: for.py

for i in range(1,5):
    print(i)
else:
    print('The for loop is over')       

#!python
#filename: break.py
while True:
    s=input('Enter something:')
    if s=='quit':
        break
    print('Length of the string is', len(s))
else:
    print('The loop is over') #这句永远都不会执行到，因为break语句不执行和循环相对应的else
print('Done')

#!python
#filename:continue.py
while True:
    s=input('Enter something:')
    if s=='quit':
        break
    if len(s)<3:
        print('Too small')
        continue
    print('Input is of sufficient length')