python中的print输出可以用逗号","
>>> a = 1
>>> b = 2
>>> print a,b
1 2
逗号分开的两个变量或者字符串之间隔一个空格
>>> print '100 + 200 =', 100 + 200
100 + 200 = 300
python中的print输出可以用逗号","
>>> a = 1
>>> b = 2
>>> print a,b
1 2
逗号分开的两个变量或者字符串之间隔一个空格
>>> print '100 + 200 =', 100 + 200
100 + 200 = 300