维护计数器变量的Python方式？

Question

我有这种代码：

count = 0

for 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 hereenumerate()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]), ...