Looking for a good replacement for elif & if , like switch case
Possible Duplicate:
Replacements for switch statement in python?
Given this method :
def getIndex(index):
if((index) < 10):
return 5
elif(index < 100):
return 4
elif(index < 1000):
return 3
elif(index < 10000):
return 2
elif(index < 100000):
return 1
elif(index < 1000000):
return 0
I want to make it in a switch-case style , however , Python doesn't support switch case .
Any replacements for that ?
那么6-len(str(index))呢？
In this particular instance I would just use maths:
def get_index(index):
return 6 - int(round(math.log(index, 10)))
You have to use the built-in function round as math.log returns a float.
经典的pythonic方法是使用一个字典，其中的键是您的测试，并且这些值是可调用函数，可以反映您打算执行的操作：
def do_a():
print "did a"
self do_b():
print " did b"
#... etc
opts = {1:do_a, 2:do_b}
if value in opts:
opts[value]()
else:
do_some_default()