Counting number of occurrences of a single digit in a list

[paul18fr]

Is the following what you were looking for at the beginning?

Paul

import numpy as np

##I build a model
n = 20
A = []
for i in range(n):
    A.append("1")
A[3] = '...1'
A[6] = '...1'

## The list is converted to an array
A = np.array(A)
loc = np.where(A == "...1")
exact_loc = list(loc)[0] # Eureka