string = '''lalalala
lalalaa1
lalalaa2
'''
la = 'pervaya liniya string'
la1 = 'vtoraya liniya string'
la2 = 'tretya liniya string'
string = '''lalalala
lalalaa1
lalalaa2
'''
la = string.split('\n')[0]
la1 = string.split('\n')[1]
la2 = string.split('\n')[2]
#ну или
la, la1, la2, *_ = string.split('\n')