一、while循环
例1
count =
0
while (
count <
9):
print 'The
count is:',
count
count =
count +
1
print
"Good bye!"
运行结果:
The
count is:
0
The
count is:
1
The
count is:
2
The
count is:
3
The
count is:
4
The
count is:
5
The
count is:
6
The
count is:
7
The
count is:
8
Good bye!
例2 (while…else句式)
count =
0
while count <
5:
print
count,
" is less than 5"
count =
count +
1
else:
print
count,
" is not less than 5"
运行结果:
0 is less than 5
1 is less than 5
2 is less than 5
3 is less than 5
4 is less than 5
5 is not less than 5
二、for循环
例3
for letter
in 'Python':
print '当前字母 :', letter
fruits = [
'banana',
'apple',
'mango']
for fruit
in fruits:
print '当前水果 :', fruit
print "Good bye!"
运行结果:
当前字母 :
P
当前字母 :
y
当前字母 :
t
当前字母 :
h
当前字母 :
o
当前字母 :
n
当前水果 :
banana
当前水果 :
apple
当前水果 :
mango
Good bye!
三、Pass语句
例4
for letter
in 'Python':
if letter ==
'h':
pass
print '这是 pass 块'
print '当前字母 :', letter
print "Good bye!"
运行结果:
当前字母 : P
当前字母 : y
当前字母 : t
这是
pass 块
当前字母 : h
当前字母 : o
当前字母 : n
Good bye!
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