维护计数器变量的Python方式？

Question

我有这种代码：count = 0for line in lines:    #do something with line    #do something more with line    #finish doing that thing with line    count = count + 1    if count % 10000 == 0:        print count这是在python中维护计数变量的正确方法吗？我可以使它看起来更好吗？

Answer 1

您可以使用enumerate()：

for count, line in enumerate(lines):

    #do something here

enumerate()也接受可选的第二个参数start，您可以使用该参数指定的起始值count。默认值为start0。

帮助enumerate：

>>> help(enumerate)

 |  enumerate(iterable[, start]) -> iterator for index, value of iterable

 |  

 |  Return an enumerate object.  iterable must be another object that supports

 |  iteration.  The enumerate object yields pairs containing a count (from

 |  start, which defaults to zero) and a value yielded by the iterable argument.

 |  enumerate is useful for obtaining an indexed list:

 |      (0, seq[0]), (1, seq[1]), (2, seq[2]), ...