python中對比數組長度

The __len__() is a method on container types. However, python also provides another option of retrieving the length of an array, using the method len().

__len __()是關于容器類型的方法。 但是，python還使用len()方法提供了另一個檢索數組長度的選項。

The len(abc) usually ends up calling abc.__len__().

len(abc)通常最終會調用abc .__ len __() 。

Example usage of len() method is as follows,

len()方法的示例用法如下，

# array declaration
test_arr = [1,2,3]
# length
print(len(test_arr))
print(test_arr.__len__())

Output

輸出量

3
3

The len() method works on a tuple, string (which are array of characters) in similar way.

len()方法以類似的方式處理元組，字符串(字符數組)。

test_tuple = (1,2,3)
# length
print(len(test_tuple))
# string 
test_str = 'include-help'
# length
print(len(test_str))

Output

輸出量

3
12

翻譯自: https://www.includehelp.com/python/preferred-way-to-retrieve-the-length-of-an-array.aspx

python中對比數組長度