What I did with a Python array

#Initialization
lst = []

for i in range(5):
    #add to
    lst.append(i)
print(lst)  # [0, 1, 2, 3, 4]

#Filter
filtered = list(filter(lambda x:x == 1, lst))
print(filtered)  # [1]

#Count
print(len(filtered))  # 1

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