PYTHON

value count a list python

from collections import Counter
z = ['blue', 'red', 'blue', 'yellow', 'blue', 'red']
Counter(z)
>>> Counter({'blue': 3, 'red': 2, 'yellow': 1})

count item in list python

list.count(element)

count number items in list python

mylist = ["abc", "def", "ghi", "jkl", "mno", "pqr"]

print(len(mylist))

# output 6

count number of element in list

"""Find all occurrences of element in list"""

# If you simply want find how many times an element appears
# use the built-in function count()
def find_occur(lst, item):
	return lst.count(item)

# Test -----------------------------------------------------------
print(find_occur([None, None, 1, 2, 3, 4, 5], None)) # 2

# If you wanna find where they occur instead
# - This returns the indices where element is found within a list

def find(lst, item):
    return [i for (i, x) in enumerate(lst) if x == item]

# Test Code ------------------------------------------------------
from random import randint, choice
lst = [randint(0, 99) for x in range(10)] # random lst
item = choice(lst) # item to find
found = find(lst, item) # lst of where item is found at
print(f"lst: {lst}",
      f"item: {item}",
      f"found: {found}",
      sep = "
")

python how to detect number of items in a list

# List of just integers
list_a = [12, 5, 91, 18]

# List of integers, floats, strings, booleans
list_b = [4, 1.2, "hello world", True]