lst1 = ['python', 'java' , 'php', 'c', 'c++', 'c#', 'vb.net']
lst2 = [1, 2, 3, 4, 5, 6, 7]
lst_lst = list(map(lambda l1, l2: l1 + '_' + str(l2), lst1, lst2))
print(lst_lst)
'''
run:
['python_1', 'java_2', 'php_3', 'c_4', 'c++_5', 'c#_6', 'vb.net_7']
'''