PYTHON

python apply function to list

# N. B. myfunction must be able to take as argument the elements of the list

def myfunction(x): 
  # process x
  return #some results

# declare your list
l1 = list(...)

# get a list with the transformed values according to myfunction
l2 = list(map(myfunction, l1))

python apply function

import pandas as pd
  
# reading csv
s = pd.read_csv("stock.csv", squeeze = True)
  
# defining function to check price
def fun(num):
  
    if num<200:
        return "Low"
  
    elif num>= 200 and num<400:
        return "Normal"
  
    else:
        return "High"
  
# passing function to apply and storing returned series in new
new = s.apply(fun)
  
# printing first 3 element
print(new.head(3))
  
# printing elements somewhere near the middle of series
print(new[1400], new[1500], new[1600])
  
# printing last 3 elements
print(new.tail(3))