Реализация цикла в многомерном массиве

#start
import pandas as pd
import numpy as np
 
workers = [['Ivan', 'Ivanov', 100000, 8], 
                ['Petr', 'Petrov', 150000, 5], 
                ['Vasya', 'Vasin', 40000, 2]
           ['Mark','Markov', 200000, 1],
           ['Pes','Psov', 200000, 8],
           ['Cat','Catov', 200000, 3],
           ['Tema','Dark', 200000, 3],
           ['Hren','Hrenov', 200000, 3],
           ['Val','Valob', 200000, 3],
           ['Krya','Korovin', 200000, 3],
          ]
 
df = pd.DataFrame (workers,columns = ['First_Name', 'Last_Name', 'Salary', 'Years'])
 
conditions = [
    (df['Years'] < 2),
    (df['Years'] >= 2) & (df['Years'] <= 5),
    (df['Years'] > 5)
    ]
values = ['junior', 'middle', 'senior']
df['Position'] = np.select(conditions, values)
 
name = (df['First_Name'].to_list())
lastname = (df['Last_Name'].to_list())
posa = (df['Position'].to_list())
 
print (name[0], lastname[0], 'is', posa [0])
print (name[1], lastname[1], 'is', posa [1])
print (name[2], lastname[2], 'is', posa [2])
print (name[3], lastname[3], 'is', posa [3])
print (name[4], lastname[4], 'is', posa [4])
print (name[5], lastname[5], 'is', posa [5])
print (name[6], lastname[6], 'is', posa [6])
print (name[7], lastname[7], 'is', posa [7])
print (name[8], lastname[8], 'is', posa [8])
print (name[9], lastname[9], 'is', posa [9])
 
#end

workers = [['Ivan', 'Ivanov', 100000, 8], 
['Petr', 'Petrov', 150000, 5], 
['Vasya', 'Vasin', 40000, 2],
['Mark','Markov', 200000, 1],
['Pes','Psov', 200000, 8],
['Cat','Catov', 200000, 3],
['Tema','Dark', 200000, 3],
['Hren','Hrenov', 200000, 3],
['Val','Valob', 200000, 3],
['Krya','Korovin', 200000, 3],
]
values = ['junior', 'middle', 'senior']
conditions = (lambda x: values[0] if x < 2 
        else values[2] if x > 5 else values[1])
for worker in workers:
    print(f'{worker[0]} {worker[1]} is {conditions(worker[3])}')