import
math
#default
print
"PI = %f"
%
math.
pi
#width = 10,precise = 3,align = left
print
"PI = %10.3f"
%
math.
pi
#width = 10,precise = 3,align = rigth
print
"PI = %-10.3f"
%
math.
pi
#前面填充字符
print
"PI = %06d"
%
int
(
math.
pi
)
#输出结果
#PI = 3.141593
#PI = 3.142
#PI = 3.142
#PI = 000003
#浮点数的格式化,精度、度和