python 格式化输出

1.打印字符串

>>> print "I'm %s" % ("jihite")
I'm jihite

2.打印整数

>>> print "I'm %d years old" % (17)
I'm 17 years old

3.打印浮点数

>>> print "π=%f" % (3.1415926)
π=3.141593

4.打印浮点数（指定保留小数点位数）

>>> print "π=%.3f" % (3.1415926)
π=3.142

5.指定占位符宽度

>>> print "NAME:%8s AGE:%8d             WEIGHT:%8.2f" % ("jihite", 17, 62.2)
NAME:  jihite AGE:      17 WEIGHT:   62.20

6.指定占位符宽度（左对齐）

>>> print "NAME:%-8s AGE:%-8d     WEIGHT:%-8.2f" % ("jihite", 17, 62.2)
NAME:jihite   AGE:17       WEIGHT:62.20 

7.指定占位符（只能用0当占位符）

>>> print "NAME:%-8s AGE:%08d WEIGHT:%08.2f" % ("jihite", 17, 62.2)
NAME:jihite   AGE:00000017     WEIGHT:00062.20

8.科学计数法

>>> format(0.0000023, '.2e')
'2.30e-06'
>>> format(0.23, '.2e')
'2.30e-01'