详谈python中冒号与逗号的区别

注意if\while\for等(或函数定义)语句在结尾处包含一个冒号――我们通过它告诉python下面跟着一个语句块。

--------------冒号的用法

if guess == number:
print 'Congratulations, you guessed it.' # New block starts here
print "(but you do not win any prizes!)" # New block ends here
elif guess < color="#ff0000">:
print 'No, it is a little higher than that' # Another block
# You can do whatever you want in a block ...
else:
print 'No, it is a little lower than that' 
--------------
def printMax(x, y): 
'''输出最大的2个数.
2个数值必需是整数.'''
x = int(x) # convert to integers,
if possible
y = int(y)
if x > y: 
print x, 'is maximum'
else:
print y, 'is maximum'
========逗号的特殊用途
for item in shoplist:
print item,

我们在print语句的结尾使用了一个 逗号 来消除每个print语句自动打印的换行符。这样做有点难看，不过确实简单有效。