比较int() round() floor()

用4个正数和4个负数作为3个函数的参数，将返回结果做个比较

 

>>> for eachnum in (.2,.7,1.2,1.7,-1.2,-1.7):
 print "int(%.1f)\t%+.1f" % (eachnum,float(int(eachnum)))
 print "floor(%.1f)\t%+.1f" % (eachnum,math.floor(eachnum))
 print "round(%.1f)\t%+.1f" % (eachnum,round(eachnum))
 print '-' * 20

 
int(0.2) +0.0
floor(0.2) +0.0
round(0.2) +0.0
--------------------
int(0.7) +0.0
floor(0.7) +0.0
round(0.7) +1.0
--------------------
int(1.2) +1.0
floor(1.2) +1.0
round(1.2) +1.0
--------------------
int(1.7) +1.0
floor(1.7) +1.0
round(1.7) +2.0
--------------------
int(-1.2) -1.0
floor(-1.2) -2.0
round(-1.2) -1.0
--------------------
int(-1.7) -1.0
floor(-1.7) -2.0
round(-1.7) -2.0
--------------------
>>>