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How to use %f in python

Jun 22, 2019 pm 01:50 PM

How to use %f in python

How to use %f in python? Let me introduce to you the related usage of %f.

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import math    
#%a.bf,a表示浮点数的打印长度,b表示浮点数小数点后面的精度    
#只是%f时表示原值,默认是小数点后5位数  
print "PI=%f" % math.pi             
# output: PI=3.141593  

#只是%9f时,表示打印长度9位数,小数点也占一位,不够左侧补空格  
print "PI=%9f" % math.pi            
# output: PI=_3.141593  

#只有.没有后面的数字时,表示去掉小数输出整数,03表示不够3位数左侧补0  
print "PI=%03.f" % math.pi          
# output: PI=003  

#%6.3f表示小数点后面精确到3位,总长度6位数,包括小数点,不够左侧补空格  
print "PI=%6.3f" % math.pi          
# output: PI=_3.142  
  
#%-6.3f表示小数点后面精确到3位,总长度6位数,包括小数点,不够右侧补空格  
print "PI=%-6.3f" % math.pi         
# output: PI=3.142_  
  
#还可以用%*.*f来表示精度,两个*的值分别在后面小括号的前两位数值指定  
#如下,不过这种方式06就失去补0的功能,只能补空格  
print "PI=%*.*f" % (06,3,math.pi)   
# output: PI=_3.142
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