Collection of algorithms in pure python

pure_python_algos.py

# Argsort
l = [1,8,3,10,13, 23,4]
# Ascending
args = sorted(range(len(l)), key=l.__getitem__)
#[0, 2, 6, 1, 3, 4, 5]
# Descending
args[::-1]
#[5, 4, 3, 1, 6, 2, 0]


# Frequency Counter
x = [1,2,2,3,3,4,4,4,5,5,5]
frequency = {}
for i in set(x):
    frequency[i] = x.count(i)
#{1: 1, 2: 2, 3: 2, 4: 3, 5: 3}

# Median
n_num = [1, 2, 3, 4, 5] 
n = len(n_num) 
n_num.sort() 

if n % 2 == 0: 
    median1 = n_num[n//2] 
    median2 = n_num[n//2 - 1] 
    median = (median1 + median2)/2
else: 
    median = n_num[n//2] 

# Mode
n_num = [1, 2, 3, 4, 5, 5]
c = {i: n_num.count(i) for i in set(n_num)}
list(c.keys())[list(c.values()).index(max(c.values()))]