No need to bother with pandas. Text files are iterable. Just open it, operate on the line (string) and fill a dictionnary.
file = "font.txt"
with open(file, "r") as f:
dic = dict()
for line in f:
x = line.strip("\n").split(" ")
key = int(x[0].strip("px"))
value = int(x[1])
if key not in dic.keys():
dic[key] = [value]
else:
dic[key].append(value)
Output:
{22: [31, 43], 11: [326, 291], 18: [8], 13: [41]}
Then it’s simple math:
total_number_of_character = sum([sum(x) for x in dic.values()])
percentage = percentage = {key:sum(value)/total_number_of_character*100 for (key, value) in dic.items()}
Output:
{22: 10.0,
11: 83.37837837837839,
18: 1.0810810810810811,
13: 5.540540540540541}
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solved Create python dictionary from TXT file – value aggregation