Beginning Python From Novice to Professional (5) － 条件与循环

条件与循环

条件执行：

name = raw_input('What is your name? ')if name.endswith('Gumby'):print 'Hello, Mr.Gumby'

What is your name? GumbyHello, Mr.Gumby

name = raw_input('What is your name? ')if name.endswith('Gumby'):print 'Hello, Mr.Gumby'else:print 'Hello, stranger'

多个条件：

num = input('Enter a number: ')if num > 0:print 'The number is positive'elif num < 0:print 'The number is negative'else:print 'The number is zero'

Enter a number: 5The number is positive

Enter a number: -1The number is negative

Enter a number: 0The number is zero

while循环：

x = 1while x<=100:print xx+=1

for循环：

numbers = [0,1,2,3,4,5,6,7,8,9]for number in numbers:print number

0123456789

循环中的else：

for n in range(99,81,-1):root = sqrt(n)if root == int(root):print nbreakelse:                                #只在没有调用break时执行print "Didn't find it!"