The Python interpreter's response to such an error is to halt the execution of the program and display an error message likeIndexError: listindexoutofrange, directly pointing out the misuse of indices. This mechanism prevents programs from proceeding with invalid data access, which could lead to...
meaning that the first element has index 0, and since the list has only one element, accessing index 1 exceeds the valid range of indices and causes the IndexError to be raised.
Python List Index Out of Range This error message appears if you try to access list elements with an index that’s either larger than the maximal allowed index or smaller than the negative indexing -len(list). Here’s the minimal example of both cases: ...
You can create a list using range() function in several ways. Therange()function in Python returns a sequence of numbers based on the specifiedstart,stop, andstepvalues. The default behavior of therange()function is to start from0and increment by1. The stop value is exclusive, meaning the...
If we index past the end of a list, we'll see a traceback:>>> fruits[15] Traceback (most recent call last): File "<stdin>", line 1, in <module> IndexError: list index out of range Indexing out-of-bounds will raise an exception. But slicing past the end of a list doesn't ...
first start with an empty one elements = [] # then use the range function to do 0 to 5 counts for i in range(0, 6): print ("Adding %d to the list." % i) # append is a function that lists understand elements.append(i) # now we can print them out too for i in elements: ...
Other features of string slicing work analogously for list slicing as well:Both positive and negative indices can be specified: >>> a[-5:-2] ['bar', 'baz', 'qux'] >>> a[1:4] ['bar', 'baz', 'qux'] >>> a[-5:-2] == a[1:4] True Omitting the first index starts the...
sys.path 即 sys.__dict__['path'] 是一个 PyListObject 对象,包含了一组PyStringObject 对象,每一个对象是一个module 的搜索路径。 第三方库路径的添加是 lib/site.py 完成的,在site.py 中完成两个动作: 1. 将 site-packages 路径加入到 sys.path 中。
IndexError: list index out of range >>> L[99] = 1 ...error text omitted... IndexError: list assignment index out of range This is intentional, as it’s usually an error to try to assign off the end of a list (and a particularly nasty one in the C language, which doesn’t do...
Inside the calculate_average_grade() function, you use a for loop to iterate over the input list of grades. Then you check if the current grade value falls outside the range of 0 to 100. If that’s the case, then you instantiate and raise your custom exception, GradeValueError. Here’...