从具有列表结构列表和空列表的文本文件中查找列表和元素的总数

Question

I am trying to compute the total number of lists and total number of elements of a text file. The text file try1.txt consists of a list of lists structure like this:

[[], ['i', 'am', 'a', 'good', 'boy'], ['i', 'am', 'an', 'engineer']] 

import ast
global inputList
inputList = []
path = "C:/Users/hp/Desktop/folder/"
def read_data():
    for file in ['try1.txt']:
        with open(path + file, 'r', encoding = 'utf-8') as infile:
           inputList.extend(ast.literal_eval(*infile.readlines()))
    print(len(inputList))
    print(sum(len(x) for x in inputList))
read_data()

The output for the above mentioned input list should be: 3 and 9.

I have tried but I am getting error when there is a empty list. Is there any way to solve the issue? If not then I want to display the output by removing the empty lists; in that case the output should be 2 and 9.

If I remove the empty list, then I am getting the output as 2 and 9. But the inclusion of empty list creating problem. The error I am getting:

ValueError: malformed node or string: <_ast.Subscript object at 0x0000020E99CC0088>

Answer 1

This problem was not the empty list! It's the LF at the end of the string.

This code work on python 3.6:

import ast
v = ast.literal_eval("[[],['i', 'am', 'a', 'good', 'boy'],['i', 'am', 'an', 'engineer']]")`

If the error persists on a older version and python upgrade is not a option, just remove the empty list before evaluate the expression:

exp = infile.read()
empty_count = exp.count('[]')
exp = exp.replace('[],','')
inputList.extend(ast.literal_eval(*exp))
print('List Count:%d' % len(inputList)+empty_count)