Counting the total number of lines is simply the number of elements in the list returned with the len (s) statement.
计算行的总数就是在len (s)语句中返回的清单元素的数量。
This means that s[:] is shorthand for s[0:len(s)]. [spec]
这意味着s[:]就是s[0:len(s)]的简写。
This means that s[:] is shorthand for s[0:len(s)]. [spec]
这意味着s[:]就是s[0:len(s)]的简写。
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